Investigation of the Performance of Various Low-Cost Radon Monitors under Variable Environmental Conditions.

A comparison of low-cost radon monitors was conducted at the Laboratory of Natural Radiation (LNR). The monitors we evaluated were EcoQube, RadonEye, RadonEye Plus2, Spirit, ViewPlus, ViewRadon and WavePlus. An AlphaGUARD monitor calibrated at the Laboratory of Environmental Radioactivity of the University of Cantabria (LaRUC), accredited for testing and calibration according to ISO/IEC 17025, provided the reference value of radon concentration. The temporal stability of the monitors was studied, obtaining a percentage of missing records ranged from 1% to 19% of the data. The main technical characteristics studied were temporal stability, measurement ranges, accuracy, correlation and response time. The main results show that the measurement ranges align with those specified by their manufacturers, with percentage differences with respect to the reference monitor of between 5% and 16%. The diversity found for response time is remarkable, with values ranging from 1 to 15 h, with Pearson correlation factors between 0.63 and 0.90.

Intercomparison of Radon Flux Monitors at Low and at High Radium Content Areas under Field Conditions.

Interlaboratory exercises are a good tool to compare the response of different systems to the same quantity and to identify possible inconsistencies between them. One of the main goals of the EMPIR 19ENV01 traceRadon project is to harmonize radon flux measurements based on different systems and methodologies. In the framework of the traceRadon Project, two radon flux intercomparison campaigns were carried out in October 2021 at high and at low radon source areas. Four institutions participated in the field intercomparison exercises with their own systems. Every system was based on a specific radon monitor (diffusion or pump mode) and an accumulation chamber (with manual or automatic opening). Radon fluxes were calculated by each participant using both exponential and linear fittings of the radon activity concentration measured over time within the accumulation chambers. The results of this study show mainly: (i) the exponential approach is not advisable due to the variability of the radon flux and the leakage of the systems during long-time measurements; (ii) the linear approach should be applied to minimize the measurement period in agreement with the time response and sensitivity of the monitors; (iii) radon flux measured at high radon source areas (radium content of about 800 Bq kg-1) risks being underestimated because of the influence of advective effects; (iv) radon flux measured at low radon source areas (radium content of about 30 Bq kg-1) may present large uncertainties if sensitive radon monitors with pump mode are not used.

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave.

A study is presented on rapid episodes of air exchange in the Polychrome Room of the Altamira Cave (Cantabria, Spain) using continuous monitoring of radon and CO2 tracer gases, as well as environmental parameters such as internal and external air temperature. For this, criteria have been developed to carry out an inventory of these types of events during the 2015-2020 period. Most of the degassing-recharging events occur over several hours or days, especially during spring and autumn. This means that the room can be significantly ventilated during these short periods of time, posing an exchange of energy and matter with potential impact in the preservation of the rock art present inside. In addition, the hypothesis that temperature gradients between the internal and external atmosphere is one of the main factors that induces degassing has been tested. To this end, correlation analysis has been carried out between the different magnitudes involved in this study, such as radon and CO2 concentrations, and air temperature gradients. A total of 37 degassing-recharging events have been analyzed for the 5 year studied period. The distribution of the duration of the events have been described, as well as that of the correlations between the degassing and recharge stages of each event, showing significant values of r coefficients for the correlation with temperature gradients between the internal and external atmosphere.

General model for estimation of indoor radon concentration dynamics.

A known relationship exists between high radon concentrations and lung cancer, and therefore, the indoor radon quantification is important, and it is beneficial to have a model to estimate indoor concentration. The work is focused on the development of an INDORAD (INDOor RAdon Dynamic) model for estimation of indoor radon dynamics, with time-dependent meteorological parameters and adjustable soil and building properties being considered. This model is based on a systemic approach, where the flows of material between compartments are considered, without a spatial resolution. This approach allowed to simplify the mathematical processing and enabled to consider together all known sources of indoor radon. The developed model was put in use in a laboratory building where soil constitutes major source of radon. The results (radon concentrations) from the model were compared to an existing data set from Saelices el Chico in a soil with high concentration of 226Ra. The outcome of the validation implies that INDORAD could predict radon concentrations satisfactorily. Suggestions for future updates of the model to improve indoor radon estimations are provided.

A New Methodology for Defining Radon Priority Areas in Spain.

One of the requirements of EU-BSS (European Basic Safety Standards) is the design and implementation of a National Radon Action Plan in the member states. This should define, as accurately as possible, areas of risk for the presence of radon gas (222Rn) in homes and workplaces. The concept used by the Spanish Nuclear Safety Council (CSN), the body responsible for nuclear safety and radiation protection in Spain, to identify "radon priority areas" is that of radon potential. This paper establishes a different methodology from that used by the CSN, using the same study variables (indoor radon measurements, gamma radiation exposure data, and geological information) to prepare a radon potential map that improves the definition of the areas potentially exposed to radon in Spain. The main advantage of this methodology is that by using simple data processing the definition of these areas is improved. In addition, the application of this methodology can improve the delimitation of radon priority areas and can be applied within the cartographic system used by the European Commission-Joint Research Center (EC-JRC) in the representation of different environmental parameters.

Intercomparison of Indoor Radon Measurements Under Field Conditions In the Framework of MetroRADON European Project.

Interlaboratory comparisons are a basic part of the regular quality controls of laboratories to warranty the adequate performance of test and measurements. The exercise presented in this article is the comparison of indoor radon gas measurements under field conditions performed with passive detectors and active monitors carried out in the Laboratory of Natural Radiation (LNR). The aim is to provide a direct comparison between different methodologies and to identify physical reasons for possible inconsistencies, particularly related to sampling and measurement techniques. The variation of radon concentration during the comparison showed a big range of values, with levels from approximately 0.5 to 30 kBq/m3. The reference values for the two exposure periods have been derived from a weighted average of participants' results applying an iterative algorithm. The indexes used to analyze the participants' results were the relative percentage difference D(%), the Zeta score ( ζ ), and the z-score ( z ). Over 80% of the results for radon in air exposure are within the interval defined by the reference value and 20% and 10% for the first and the second exposure, respectively. Most deviations were detected with the overestimating of the exposure using passive detectors due to the related degassing time of detector holder materials.

Variations in radon dosimetry under different assessment approaches in the Altamira Cave.

The atmosphere of caves is a special environment where it is necessary to take into account some particular characteristics when assessing the radon dose. The equilibrium factor (F) between radon and its progeny, and especially its unattached fraction (f p), is a key parameter in radon dose evaluation. In order to consider the specific features of the atmosphere in the Altamira Cave, the radon and particle concentrations have been measured. The mean annual radon concentration inside the cave over the period 2013-2019 is around 3500 Bq m-3 with a standard deviation of 1833 Bq m-3 and this exhibits seasonal variations. This value surpasses all international (WHO, IAEA, ICRP) upper action and reference levels (occupational and non-occupational). Dose rate levels expressed in µSv h-1 were estimated for four different equilibrium scenarios between radon and its progeny 218Po, 214Pb, 214Bi and 214Po. The most recent dose conversion factors have been used and the contribution made to the dose by the unattached fraction of radon progeny f p has been also assessed from the particle concentration. The results suggest that the mean annual dose levels show variations of up to 500% due to the range of F and the f p considered in this study. Given the high radon concentrations usually found in show caves, the best way to reduce this variability and its associated uncertainty in dose assessment is to conduct specific studies aimed at determining both F and f p.

Testing and Calibration of CDs as Radon Detectors at Highly Variable Radon Concentrations and Temperatures.

The application of the compact disk (CD) method for radon measurements at mines, caves and other workplaces needs testing under highly variable exposure conditions. We present the results from a blind comparison of CDs exposed in the Laboratory of Natural Radiation (Saelices el Chico, Spain). During the exposure the temperature varied from 6.5 to 24.9 °C (average 12.6 °C) and the 222Rn activity concentrations varied from <10 Bq m-3 to 147 kBq m-3. Good correspondence was observed between the integrated 222Rn activity concentration determined by the reference instruments in the laboratory (122,500 ± 6100 kBq h m-3) and that assessed by analysis of the CDs at a depth 80 µm beneath the front surface (118,000 ± 12,000 kBq h m-3) and at a depth of 120 µm (106,000 ± 12,000 kBq h m-3). The theoretical modeling of the CD response under variable temperature and radon concentration suggested that the small bias is probably due to the time variation of the calibration factor because of the time variations of the temperature.

Radon mitigation by soil depressurisation case study: Radon concentration and pressure field extension monitoring in a pilot house in Spain.

A one-year monitoring study was conducted in a pilot house with extremely high radon levels to investigate the ability and efficiency of radon mitigation by soil depressurisation (SD) both active and passive. The study included monitoring of radon concentration, pressure field extension (PFE) under the slab and some atmospheric parameters for different testing phases. Periods in which the house remained closed to foster radon accumulation were alternated with phases of active and passive soil depressurisation under different conditions. The behaviour of the radon concentration in the pilot house was analysed along with the influence of atmospheric variables, significant correlations were found for the radon concentration with atmospheric pressure, outdoor temperature and wind. From the PFE analysis it was proven that the pressure drop with distance from the suction point of the SD system is proportional to the depressurisation generated. A behaviour law was found for the permeability characterisation of the house based on the active SD performance and also, the relationship between wind velocity and extraction airflow during passive SD operation by means of a rotating cowl was obtained. Radon reductions in excess of 85% were achieved for the different testing phases in all cases. Finally, from the results it was postulated that a fan power of 20 W is sufficient to ensure radon reductions over 85% for dwellings with similar aggregate layer and soil permeability.

Performance of radon monitors in a purpose-built radon chamber.

The purpose of this paper is to benchmark several different radon monitors, by quantifying their accuracy and response time. Radon monitors with different characteristics were tested in a purpose-built radon chamber under reference conditions. The radon concentration in the chamber was controlled and maintained at a stable radon concentration of (2648 ± 85) Bq m-3 to evaluate the accuracy and precision of these monitors. The response time of the monitors was analysed for two time intervals. To assess the response time of the monitors, radon concentration was varied from a theoretical value of 0-6441 Bq m-3 and then from 6441 to 2648 Bq m-3. The results from this study show that general purpose radon monitors are less accurate than those used by radon testing service providers and the research community. All monitors tested reported a mean radon concentration within the ±10% of the reference detector value at the radon equilibrium concentration. Different response time analysis methods were proposed and discussed, and for the particular time intervals analysed, response time was found to be slower for those radon monitors intended for general purpose applications.

Continuous monitoring of radon gas as a tool to understand air dynamics in the cave of Altamira (Cantabria, Spain).

The use of radon as an atmospheric tracer in the Altamira Cave over the past 30years has provided relevant information about gaseous exchanges between the Polychromes Room, the adjoining Chambers inside the cave, and the outside atmosphere. The relatively simple physico-chemical behaviour of radon gas provides a marked advantage over other tracer gases that are usually present in high concentrations in hypogeous environments, such as CO2. Two types of continuous radon measurement were undertaken. The first involves active detectors located in the Hall and Polychromes Room, which provide radon concentration values at 1-hour intervals. In addition, nuclear solid track etched detectors (CR-39) are used in every chamber of the cave over 14-day exposure periods, providing average radon concentrations. In this paper we show some of the specific degassing and recharge events identified by anomalous variations in the concentration of radon gas in the Polychromes Room. In addition, we update knowledge regarding the degree of connection between chambers inside the cave and with the outside atmosphere. We verify that the connection between the Polychromes Room and the rest of the cave has been drastically reduced by the installation of the second closure in 2008. Except for point exchanges with the Crossing zone generated by a negative temperature gradient in that direction, the atmosphere of the Polychromes Room remains stable, or else it exchanges matter with the outside atmosphere through the karst interface. The role of radon as a tracer is demonstrated to be valid both to reflect seasonal cycles of degassing and recharge, and to analyse shorter (daily) period fluctuations.

Description of the behavior of an aquifer by using continuous radon monitoring in a thermal spa.

Radon ((222)Rn) levels in air and water have been analyzed continuously for almost a year in Las Caldas de Besaya thermal spa, north Spain. Radon is a naturally occurring noble gas from the decay of radium ((226)Ra) both constituents of radioactive uranium 238 series. It has been recognized as a lung carcinogen by the World Health Organization (WHO) and International Agency for Research on Cancer (IARC). Furthermore the Royal Decree R.D 1439/2010 of November, 2010 establishes the obligation to study occupational activities where workers and, where appropriate, members of the public are exposed to inhalation of radon in workplaces such as spas. Together with radon measures several physico-chemical parameters were obtained such as pH, redox potential, electrical conductivity and air and water temperature. The devices used for the study of the temporal evolution of radon concentration have been the RTM 2100, the Radon Scout and gamma spectrometry was complementarily used to determine the transfer factor of the silicone tubes in the experimental device. Radon concentrations obtained in water and air of the spa are high, with an average of 660 Bq/l and 2900 Bq/m(3) respectively, where water is the main source of radon in the air. Radiation dose for workers and public was estimated from these levels of radon. The data showed that the thermal processes can control the behavior of radon which can be also influenced by various physical and chemical parameters such as pH and redox potential.

[Survey of risk factors and renal disease in first-degree relatives of dialysis patients]. / Relevamiento de factores de riesgo y de enfermedad renal en familiares de pacientes en dialisis.

BACKGROUND: It has been established that first-degree relatives of patients with chronic kidney disease (CKD) have a higher CKD risk than the overall population. This paper deals with the relative frequency of CKD markers and cardiovascular (CV) risk factors within first-degree relatives of ESRD patients in Argentina. METHODS: 810 family members volunteered to participate; of them 668 over 18 ys. old. Trained nurses interviewed them and completed a questionnaire dealing with family history of renal and cardiovascular disease. Blood pressure, urine and blood analysis and anthropometric data were collected. Selected parameters were: smoking habit, presence of high blood pressure, diabetes, hypercholesterolemia, high plasma creatinine and creatinine clearance estimated by MDRD formula, proteinuria and microalbuminuria. In pediatric population, weight and blood pressure parameters were evaluated as percentiles. CKD were classified in stage (National Kidney Foundation). RESULTS: The relative frequencies were: CKD: 29.6%; proteinuria: 13.9%; microalbuminuria: 8.7%. The prevalence values found for main CV risks factors, adjusted by sex and age, were: high blood pressure= 41.8%; overweight/obesity by BMI= 62.1%, hypercholesterolemia= 42.9% and hyperglycemia= 5.2%. Smoking habit was present in 34.8%. IN CONCLUSION: Prevalence of overweight/obesity, hypertension and hypercholesterolemia in first-degree relatives of ESRD patients is higher than previously communicated in studies of national reference populations. Prevalence of CKD is high, estimated as three-fold higher than for a general population as reported in poblational studies. These results support the fact that first-degree relatives of ESRD patients, as has been established elsewhere, constitute a population at high risk for developing ESRD.

Relevamiento de factores de riesgo y de enfermedad renal en familiares de pacientes en diálisis / Survey of risk factors and renal disease in first-degree relatives of dialysis patients

En publicaciones previas se muestra que familiares con vínculo primario de pacientes con enfermedad renal crónica tienen mayor riesgo de desarrollar la enfermedad que la población general. Objetivo: conocer la frecuencia relativa de marcadores de enfermedad renal crónica y factores de riesgo cardiovascular entre familiares con vínculo primario de pacientes en diálisis. Material y métodos: se estudiaron 810 voluntarios, 668 mayores de 18 años. Se les realizó una encuesta sobre antecedentes de enfermedad renal y cardiovascular. Se midieron presión arterial y datos antropométricos, y se tomaron muestras para análisis de orina y sangre. Los parámetros valorados en la población adulta fueron: hábito de fumar, presencia de hipertensión arterial (HTA), obesidad, diabetes, hipercolesterolemia, creatininemia y clearance de creatinina estimado por MDRD, proteinuria y microalbuminuria por tira reactiva con lectura digital. En población pediátrica se consideraron los percentilos para peso y presión arterial. Se clasificó a la población por estadios de enfermedad renal crónica según recomendación de la National Kidney Foundation. Resultados: Frecuencias relativas de ERC= 29.6%; proteinuria = 13.9% y microalbuminuria= 8.7%. Las frecuencias relativas, ajustadas por sexo y edad, fueron: de HTA 41.8%, sobrepeso/obesidad 62.1%, e hipercolesterolemia 42.9%, y de hiperglucemia 5.2%. El 34.8% de los encuestados eran fumadores. En conclusión: En población adulta la prevalencia de sobrepeso/obesidad, hipertensión arterial e hipercolesterolemia entre familiares con vínculo primario de pacientes en TSR fue más elevada que las comunicadas en estudios poblaciones nacionales. La prevalencia de enfermedad renal crónica también fue elevada, estimándose en tres veces superior a la de la población general. Estos resultados apoyan el hecho que los familiares con vínculo primario de pacientes en diálisis constituyen una población de alto riesgo de enfermedad renal crónica. (AU)

Background: It has been established that first-degree relatives of patients with chronic kidney disease (CKD) have a higher CKD risk than the overall population. This paper deals with the relative frequency of CKD markers and cardiovascular (CV) risk factors within first-degree relatives of ESRD patients in Argentina. Methods: 810 family members volunteered to participate; of them 668 over 18 ys. old. Trained nurses interviewed them and completed a questionnaire dealing with family history of renal and cardiovascular disease. Blood pressure, urine and blood analysis and anthropometric data were collected. Selected parameters were: smoking habit, presence of high blood pressure, diabetes, hypercholesterolemia, high plasma creatinine and creatinine clearance estimated by MDRD formula, proteinuria and microalbuminuria. In pediatric population, weight and blood pressure parameters were evaluated as percentiles. CKD were classified in stage (National Kidney Foundation). Results: The relative frequencies were: CKD: 29.6%; proteinuria: 13.9%; microalbuminuria: 8.7%. The prevalence values found for main CV risks factors, adjusted by sex and age, were: high blood pressure= 41.8%; overweight/obesity by BMI= 62.1%, hypercholesterolemia= 42.9% and hyperglycemia= 5.2%. Smoking habit was present in 34.8%. In conclusion: Prevalence of overweight/obesity, hypertension and hypercholesterolemia in first-degree relatives of ESRD patients is higher than previously communicated in studies of national reference populations. Prevalence of CKD is high, estimated as three-fold higher than for a general population as reported in poblational studies. These results support the fact that first-degree relatives of ESRD patients, as has been established elsewhere, constitute a population at high risk for developing ESRD.(AU)

Relevamiento de factores de riesgo y de enfermedad renal en familiares de pacientes en diálisis / Survey of risk factors and renal disease in first-degree relatives of dialysis patients

En publicaciones previas se muestra que familiares con vínculo primario de pacientes con enfermedad renal crónica tienen mayor riesgo de desarrollar la enfermedad que la población general. Objetivo: conocer la frecuencia relativa de marcadores de enfermedad renal crónica y factores de riesgo cardiovascular entre familiares con vínculo primario de pacientes en diálisis. Material y métodos: se estudiaron 810 voluntarios, 668 mayores de 18 años. Se les realizó una encuesta sobre antecedentes de enfermedad renal y cardiovascular. Se midieron presión arterial y datos antropométricos, y se tomaron muestras para análisis de orina y sangre. Los parámetros valorados en la población adulta fueron: hábito de fumar, presencia de hipertensión arterial (HTA), obesidad, diabetes, hipercolesterolemia, creatininemia y clearance de creatinina estimado por MDRD, proteinuria y microalbuminuria por tira reactiva con lectura digital. En población pediátrica se consideraron los percentilos para peso y presión arterial. Se clasificó a la población por estadios de enfermedad renal crónica según recomendación de la National Kidney Foundation. Resultados: Frecuencias relativas de ERC= 29.6%; proteinuria = 13.9% y microalbuminuria= 8.7%. Las frecuencias relativas, ajustadas por sexo y edad, fueron: de HTA 41.8%, sobrepeso/obesidad 62.1%, e hipercolesterolemia 42.9%, y de hiperglucemia 5.2%. El 34.8% de los encuestados eran fumadores. En conclusión: En población adulta la prevalencia de sobrepeso/obesidad, hipertensión arterial e hipercolesterolemia entre familiares con vínculo primario de pacientes en TSR fue más elevada que las comunicadas en estudios poblaciones nacionales. La prevalencia de enfermedad renal crónica también fue elevada, estimándose en tres veces superior a la de la población general. Estos resultados apoyan el hecho que los familiares con vínculo primario de pacientes en diálisis constituyen una población de alto riesgo de enfermedad renal crónica.

Background: It has been established that first-degree relatives of patients with chronic kidney disease (CKD) have a higher CKD risk than the overall population. This paper deals with the relative frequency of CKD markers and cardiovascular (CV) risk factors within first-degree relatives of ESRD patients in Argentina. Methods: 810 family members volunteered to participate; of them 668 over 18 ys. old. Trained nurses interviewed them and completed a questionnaire dealing with family history of renal and cardiovascular disease. Blood pressure, urine and blood analysis and anthropometric data were collected. Selected parameters were: smoking habit, presence of high blood pressure, diabetes, hypercholesterolemia, high plasma creatinine and creatinine clearance estimated by MDRD formula, proteinuria and microalbuminuria. In pediatric population, weight and blood pressure parameters were evaluated as percentiles. CKD were classified in stage (National Kidney Foundation). Results: The relative frequencies were: CKD: 29.6%; proteinuria: 13.9%; microalbuminuria: 8.7%. The prevalence values found for main CV risks factors, adjusted by sex and age, were: high blood pressure= 41.8%; overweight/obesity by BMI= 62.1%, hypercholesterolemia= 42.9% and hyperglycemia= 5.2%. Smoking habit was present in 34.8%. In conclusion: Prevalence of overweight/obesity, hypertension and hypercholesterolemia in first-degree relatives of ESRD patients is higher than previously communicated in studies of national reference populations. Prevalence of CKD is high, estimated as three-fold higher than for a general population as reported in poblational studies. These results support the fact that first-degree relatives of ESRD patients, as has been established elsewhere, constitute a population at high risk for developing ESRD.

Analysis of the main factors affecting the evaluation of the radon dose in workplaces: the case of tourist caves.

High concentrations of radon exist in several workplaces like tourist caves mainly because of the low ventilation rates existing at these enclosures. In this sense, in its 1990 publication, the ICRP recommended that high exposures of radon in workplaces should be considered as occupational exposure. In developed caves in which guides provide tours for the general public great care is needed for taking remedial actions concerning radon, because in some circumstances forced ventilation may alter the humidity inside the cave affecting some of the formations or paintings that attract tourists. Tourist guides can work about 1900 h per year, so the only option to protect them and other cave workers from radon exposure is to apply an appropriate system of radiation protection mainly based on limitation of exposure by restricting the amount of time spent in the cave. Because of the typical environmental conditions inside the caves, the application of these protecting actions requires to know some indoor air characteristics like particle concentration, as well as radon progeny behaviour in order to get more realistic effective dose values In this work the results of the first two set of radon measurements program carried out in 10 caves located in the region of Cantabria (Spain) are presented.