Novel g-C3N4/PrFeO3 nanocomposites with Z-scheme structure and superior photocatalytic activity toward visible-light-driven removal of tetracycline antibiotics.

In the presented work, heterostructured nanocomposites based on g-C3N4 and PrFeO3 with different mass content of PrFeO3 (0-10 wt%) were prepared by ultrasonic processing to study their photocatalytic activity in the process of antibiotic degradation under visible light. The study of phase composition, structural, morphological and textural characteristics carried out by powder X-ray diffraction, scanning electron microscopy and adsorption-structural analysis confirmed the presence of two phases - graphite-like C3N4 and orthorhombic PrFeO3 with average crystallite sizes of 5 and 21 nm and mesoporous structure with specific surface area of 57.2-68.6 m2/g and average pore size of 20 nm. The measured values of the forbidden bandwidth for the obtained nanocomposites were ∼3 eV, indicating potential activity under visible light irradiation. The efficiency of antibiotic removal under visible light was evaluated in the degradation of TCHCl. It was found that 5 % PrFeO3 content was optimal and increased the TOF by 5 times compared to pure g-C3N4. The results of photocatalytic test with absorbers showed that photocatalysis occurs by Z-scheme mechanism. The results obtained allow us to consider this nanocomposite as an effective and stable photocatalyst for pharmaceutical wastewater treatment.

[Comparative analysis of dose distribution in photon and proton therapy of prostate cancer].

Comparative analysis of the dose distribution in photon and proton therapy of prostate cancer is performed. The degree of exposure of healthy organs to radiation is assessed for each of the two treatment techniques using the time-dose-fractionation parameter.

[An approach to decreasing the dose load in prophylactic X-ray examination].

The concept of small radiation dose is uncertain. Usually, doses below 300 mSv are considered as small. In this work, a mathematical approach is used to consider changes in peripheral blood count caused by exposure to an effective dose below 1 mSv. The ACS-ENOFIT device is used to assess the efficiency of treatment of a number of diseases. The results obtained in this work show that an analytical method should be used for determination of the dose value and monitoring of changes in the systems of human body.

[Use of ACS-ENOFIT system for mass-scale examinations].

Typical procedures for introduction of the ACS-ENOFIT system into use in medical institutions are considered. The ACS-ENOFIT system can be used for health status monitoring on the basis of analysis of standard peripheral blood count.

[Analytical-equipment method for the estimation of the organism health condition and all it's systems after radiation].

Software for estimation of the health state of human body and its systems on the basis of blood parameters is described. The software uses ACS-ENOFIT analytical model based on image recognition theory and cluster analysis. This analytical method makes it possible to assess the state of patient's health and the state of each of the 10 body systems. Thus, prophylactic X-ray examination based on measurement of blood parameters makes it possible to reveal various disorders at different stages of development.

[Effective radiation doses of the personnel at rentgenosurgical studies].

In the paper versatile study of radiation dose of the medical personnel is carried out at rentgenosurgery with application of tissue-equivalent phantoms. For the first time spectrometric study of dissipated radiation by object is carried out, normalized to unit of exposition dose fields around of the object are constructed.

[An analytical evaluation of the peripheral blood charging parameters on the condition of the organism and its systems]. / Analiticheskaia otsenka vliianiia pokazatelei perifericheskoi krovi na sostoianie organizma i ego sistem.

Potentialities of analyzing the health condition of human organism and of its separate systems, i.e. digestive, respiratory, cardiovascular, etc., by the peripheral-blood parameters and with the help of the suggested AKS-ENOFIT analytical system are demonstrated in the paper.

[Application of an analytical method for processing peripheral blood tests to establish the effect of low-dose radiation on the body]. / Primenenie analiticheskogo metoda obrabotki analizov perifericheskoi krovi dlia ustanovleniia deistviia na organizm malykh doz izlucheniia.

The condition of the body subjected to low radiation doses was studied by using an automatic classification system. It was for the first time, that a scheme of action within the range of 1-1.5 mSv/y was described. The experimental results are substantiated by an extensive proof.

[Analysis in changes in health status as a result of irradiation with low doses of ionizing radiation]. / Analiz izmeneniia sostoianiia zdorov'ia v rezul'tate oblucheniia malymi dozami ioniziruiushchego izlucheniia.

The first part of this paper is published in the journal "Meditsinskaya Tekhnika" (Medical Engineering), No. 2, 2002. The paper analyzes the data available in the literature and the authors' own findings relating to the effects of small-dosage ionizing radiation on the human health status and on biological objects.

[Analysis of the effects of low doses of ionizing radiation]. / Analiz éffektov deistviia malykh doz ioniziruiushchego izlucheniia.

The paper analyzes the data available in the literature and the authors' own findings relating to the effects of low-dose ionizing radiation on biological objects, which confirm a higher likelihood of general somatic diseases upon exposure to small dosages (as low as 200 meq).

[Use of an automated classifying system for the dispensary system of the population]. / Ispol'zovanie avtomatizirovannoi klassifitsiruiushchei sistemy dlia dispanserizatsii naseleniia.

While processing blood values by an automatic classifying system, human beings can be divided into healthy (normal) and unhealthy (ill) persons. In so doing, one can evaluate the status of the body's individual systems (gastrointestinal tract, respiratory organs, locomotor apparatus, heart and vessels, urinary, endocrine, hemopoietic, and female genital organs, the central nervous system), which allows a physician to find a source of poor health from the very onset of disease.

[The shaping of radiation doses and of dose-effect curves for patients undergoing x-ray studies]. / Formirovanie dozovykh nagruzok i krivykh doza--éffekt dlia patsientov, podvergaiushchikhsia rentgenologicheskim issledovaniiam.

Human peripheral blood values are used to define an effective dose at X-ray study. Processing is made on a technical unit comprising a blood analyzer and a computer supplied by a so-called automatic classifying system. The program is based on the recognition of images with nonstatistical assessment. A dose-effect could be first plotted in the range of effective single radiation doses of 0.8-25 mZv.

[Device-aided determination of an effective dose in x-ray studies]. / Apparaturnoe opredelenie éffektivnoi dozy pri rentgenologicheskikh issledovaniiakh.

The paper proposes how to determine an effective radiation dose for patients undergone X-ray examinations, which includes the estimation of the size of a field while measuring the superficial dose and the assessment of an experiment protocol by taking into account the X-ray receiver used to measure exposure.

[Radiation dosage exposure of the population of the USSR from x-ray diagnosis and means for its reduction]. / Dozovye nagruzki na naselenie SSSR pri rentgenodiagnostike i mery ikh snizheniia.

The paper is concerned with main values of dose exposure of the USSR population as a result of medical roentgenological investigations. The authors issue practical organizational-methodological recommendations for irradiation reduction resulting from giving up chest x-ray, a decrease in prophylactic fluorography, improvement of technical facilities for investigations of the digestive tract, and organization of roentgenoradiological departments as independent health service units.

[Analysis of errors in the determination of the collective equivalent dose in x-ray diagnostic studies]. / Analiz pogreshnostei v opredelenii kollektivnoi éffektivnoi ékvivalentnoi dozy pri rentgenodiagnosticheskikh issledovanii.

The paper is devoted to an analysis of random errors in the determination of a collective effective equivalent dose resulting from radiodiagnostic investigations. The error of a collective dose does not exceed 30% and hardly depends on dose errors in human organs and tissues. The authors have established an extent of overestimation of the risk of long-term radiation effects in patients after x-ray investigations.

[Equivalent doses in x-ray studies]. / Ekvivalentnaia doza pri rentgenologicheskikh issledovaniiakh.

The authors proposed a method of estimation of equivalent doses in x-ray investigations permitting the control of a possibility of the development of nonstochastic effects. They also considered a method for calculation of equivalent doses in x-ray investigations in the head and neck area and the rest of the patient's body.