investigation on the performance of dose calibrators in nuclear medicine centers in Iran

To investigate the status of the nuclear medicine [NM] centers in Iran for the performance of dose calibrators, 18 out of 54 centers providing NM services in Iran were randomly selected and inspected in 1997. In the first phase of the study the selected centers were inspected for performing of quality control [QC] tests of dose calibrators. The linearity of the activity response, precision, accuracy, and the physical functions of the instruments, were studied. In the second phase of the study, carried out in 2006, 28 out of 75 NM centers were investigated for QC tests performance. The QC tests were performed by using standardized radio nuclides of Tc-99m and Cs-137 in the first phase, and Tc-99m and I-131 in the second phase of the studies. Standard procedures were used for carrying out the tests. According to the obtained results in the first phase of the study, 10 centers were found to be in unacceptable situation. Following this study, all the concerned NM centers were informed about the results, and at the same time the repair and adjustment of the dose calibrators were requested. In addition, the appropriate training courses along with the QC testing manuals were provided to the centers. Based on the data of the second phase of the study, only 6 NM centers were in unacceptable situation. The results indicated the effectiveness of the improvements carried out in the working procedures of the centers during interval between the two phases of investigation

Providing interoperability for air quality in-situ sensors observations using GML technology

Geographic information provides the basis for many types of decisions ranging from simple path finding, to the sustainable management of environmental conditions. Producing such information is a time consuming and costly endeavor. Data sharing on the web is an avenue to increase the efficiency of the practices. This paper scientifically examines the new emerging technologies namely, internet, geographic markup language [GML], and observation and measurement models, to construct an interoperable repository for air quality sensors measurements. The paper also elaborates on the design and implementation of a web-based air quality information system [AQIS] for the city of Tehran. In-situ sensors measure ozone [O[3]], carbon monoxide [CO], sulfur dioxide [SO[2]], nitrogen dioxide [NO[2]] and particulate matters [PM] in polluted metropolitans. Providing real-time air quality information can improve the decisions of the pertinent environmental organizations. Using GML for encoding sensors observations makes it possible to build an interoperable repository that is independent of platforms and vendors. Providing query possibilities based on monitoring stations, sensor names [pollutants], date and time intervals, and spatial query on the AQIS interfaces are the major functions of this system. Although standardized, it was concluded that the use of GML as data format increases the size of GML document. In addition, the developed system provides no map based results for the clients. Therefore, it is required to be improved by adding more GIS functions

Personnel internal radiattion exposure to iodine-125 in a radioiodination laboratory: exposure levels and trends

Monitoring internal exposure of individuals handling significant amounts of iodine-125 [I-125] for iodination is of great importance. These individuals are potentially exposed to external contamination, and internal contamination through inhalation, ingestion and intact skin absorption, to I-125. Considering radiological toxicity of this radionuclide its monitoring in the workplace and workers is necessary for radiation protection purposes. Direct measurement of I-125 in thyroid of individuals, known as a common and reliable method, was applied in the framework of monitoring program. Intakes of I-125 by individuals and the associated effective doses were evaluated using thyroid monitoring results and recommended metabolic models. The monitoring results of the laboratory personnel for a period of 3 years are given and compared. According to the results, the intakes of I-125 by individuals in the early phase of laboratory operations were higher due to insufficient facilities and experience. Improvements in the radiation protection facilities of the laboratory and personnel including provision of personal respiratory protection devices resulted in significant reduction of I-125 intakes. According to 3 years results from the implementation of internal exposure monitoring program for personnel producing I-125 labeled compounds, the exposure levels of the personnel have contineously decreased due to improvements in working conditions and increasing of personnel experiences

Renewable energy in Iran: challenges and opportunities for sustainable development

Around the globe, developing countries have reported different cases of successfully implemented Renewable Energy [RE] program supported by bilateral or multilateral funding. In developing countries subsidy has played a big role in RE program marketing and whether this will lead to sustainable development is yet to be determined. The adoption of implementation strategies that will support sustainable development and overcoming barriers that hinder expansion of Renewable Energy Technologies [RETs] still remains as a big challenge to stakeholders involved in promotion of RE resources in developing countries. In this respect, developing countries need to re-examine their environmental policy for promotion of RETs in order to define its role in revitalization of their economies. This paper reviews the policy incentives for promotion of RETs in the Islamic Republic of Iran. Setting-up international collaborative business ventures between local industry in Iran and RE companies in developed countries is proposed as an implementation strategy that will appropriate diffusion of RETs in the country. An organizational framework that may help to attain this objective is discussed and a structural model for RE business partnership is presented. It is concluded that with appropriate policy formulations and strategies, RETs can bring about the required socio-economic development in Iran