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Manabe, Kentaro; Sato, Kaoru; Takahashi, Fumiaki
BIO Web of Conferences (Internet), 14, p.03011_1 - 03011_2, 2019/05
Times Cited Count：0 Percentile：0.21(Public, Environmental & Occupational Health)Dose coefficients, which are committed effective dose per unit intake of radionuclides, are fundamental amounts for dose estimation and protection standards against internal exposures. In this study, we built a calculation function of dose coefficients using the latest dosimetric models and data as a part of development of internal dosimetry code in accordance with 2007 Recommendations of the International Commission of Radiological Protection (ICRP). Quality of the function was assured by comparing the results generated by the function to values recorded in a database of dose coefficients for workers provided by ICRP. In the presentation, we will report the results of quality assurance and the future plans of code development.
Endo, Akira
Hoken Butsuri, 52(1), p.39 - 41, 2017/03
Radiological protection requires the quantification of the extent of exposure of the human body to ionizing radiation. To this end, the International Commission on Radiological Protection (ICRP) and the International Commission on Radiation Units and Measurements (ICRU) developed a dosimetry system consisting of protection quantities and operational quantities. The existing dosimetry system has been successfully used in radiological protection practice and regulations. Nevertheless, the system has some limitations and needs further improvements to consider changes in the fields of radiological protection. ICRP and ICRU have been discussing the issues to propose an alternative system of radiation dosimetry. This presentation overviews recent discussion on the protection quantities and operational quantities by ICRP and ICRU and the proposed dosimetry system for radiological protection.
Manabe, Kentaro; Takahashi, Fumiaki; Sato, Kaoru
no journal, ,
Japan Atomic Energy Agency is developing a program using the latest models and data for estimation of internal dose compliant with the 2007 Recommendations of the International Commission on Radiological Protection (ICRP). Nuclear decay data, specific absorbed fraction data for adult males and females, and radiation weighting factors and tissue weighting factors have been published as the models and data compatible with the 2007 Recommendations. The program equips all the latest models and data, and can evaluate radiation weighted S coefficients. A test calculation was executed using the program for evaluation of S coefficients for self-absorption in the thyroid of adult males corresponding to the 2007 and 1990 Recommendations. The coefficient based on the 2007 and 1990 Recommendations was 1.3 
10
Sv/decay and 1.6 10 Sv/decay, respectively, and the coefficient decreased 18%. This is because correction of the mass of organs considering their blood content was executed for self-absorption cases. We will report the development status of this program, and the results of test calculations and the study.
Takahashi, Fumiaki; Sato, Kaoru; Manabe, Kentaro
no journal, ,
Revisions of radiation protection regulations are being discussed based on the outline of the International Radiation Protection Commission (ICRP) 2007 recommendation in Japan. Internal exposure protection standards are to be reviewed based on the new effective dose coefficient. ICRP has published new dose coefficients for occupational intake of principal 28 elements as publications. Thus, differences in chemical form and dose coefficients are investigated by comparison of the publications with Japanese standards. Chemical forms are newly taken into account for internal dosimetry of some elements, according to new scientific knowledge. An influential factor is also analyzed for revisions of dose coefficients. Now, we are progressing to develop a new code that enables us to analyze influential factors on revisions of dose coefficients.
Takimoto, Misaki; Yamazaki, Takumi; Takada, Chie
no journal, ,
no abstracts in English
Manabe, Kentaro; Sato, Kaoru; Takahashi, Fumiaki
no journal, ,
no abstracts in English
Takahashi, Fumiaki; Manabe, Kentaro; Sato, Kaoru; Tokashiki, Yuji*
no journal, ,
If national radiation safety regulations are revised by adapting the concept of the ICRP 2007 Recommendations, the protection standard values are also reviewed for radiation exposure. Thus, JAEA has developed an internal dosimetry code based on the ICRP 2007 Recommendations since FY 2017. Two functions are to be incorporated to the codes. One is "dose coefficient calculation function" that is used to verify the new dose coefficients by ICRP and the other is "nuclide intake estimation function" for internal dosimetry monitoring. In addition, we have developed GUI to set up calculation condition and functions to indicate results. In the dose coefficient calculation function, a user can set up internal dosimetry model based upon the 1990 recommendation to investigate the influencing factors on a difference between the old and new dose coefficients. In addition, results such as in-vivo radioactivity are also displayed with a graph in the nuclide intake estimation function. We will report an overview of the beta version of the code that integrates the two functions.
Takahashi, Fumiaki; Sato, Kaoru; Manabe, Kentaro
no journal, ,
The Nuclear Regulatory Authority (NRA) of Japan has proceeded discussions to incorporate the ICRP 2007 Recommendation into radiation regulations in Japan. If regulations are revised, the standards for radiation protection are to be also changed. JAEA has developed internal dosimetry code to check whether new dose coefficients are correctly derived according to dosimetry model and data based upon the 2007 Recommendations. The code equips new dosimetry model and data based on the 2007 Recommendations and is designed to add new models which are to be published in future. Verification studies are performed by referring to new dose coefficients by ICRP. In addition, a function is also equipped to estimate intake of radionuclides by monitoring.
Takahashi, Fumiaki; Manabe, Kentaro; Sato, Kaoru
no journal, ,
The International Commission on Radiological Protection (ICRP) has published dose coefficients for internal exposure dose evaluation in accordance with dose assessment methods in the 2007 Recommendations based on newly obtained findings. In the future, if the policy of ICRP 2007 Recommendation is incorporated into national radiation regulations, standards for internal exposure protection are to be revised based on the new coefficients. Therefore, JAEA has developed an internal dose assessment code to verify whether the dose coefficient published by the ICRP has been accurately derived from fundamental dosimetry models and data or not, through a project commissioned by the Nuclear Regulatory Agency. The code also implements functions for radiation dose management and emergency dose assessment at each site based on the 2007 Recommendations. In this presentation, we will report the outline of the beta version of the code developed and examples of its application.
Takahashi, Fumiaki; Manabe, Kentaro
no journal, ,
If the 2007 Recommendations of International Commission on Radiological Protection (ICRP) are incorporated to radiation regulations in Japan, the regulatory standard values are also to be revised for exposure dose assessment. Thus, we have proceeded surveys of exposure dose evaluation data based on the 2007 Recommendations. New effective dose conversion coefficients are published by expanding radiation types and energies beyond the current regulations in Japan for external exposure dose assessments. In addition, new effective dose coefficients for internal dosimetry due to occupational exposure have been given with radioisotope types revised by reflecting the latest scientific knowledge. Here, it might be essential to consider whether to adopt these data with consideration of exposure situations at radiation facilities. In addition, we should take care of discussions in ICRP for the general recommendations in future.
