• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2000 Fiscal Year Final Research Report Summary

Reevaluation of the dosimetry system 1986 (DS86) according to the US-Japan joint study and the analysis of the radiation effects

Research Project

Project/Area Number 10480136
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 環境影響評価(含放射線生物学)
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

HOSHI Masaharu  Research Institute for Radiation Biology and Medicine, HIROSHIMA UNIVERSITY, Professor, 原爆放射能医学研究所, 教授 (50099090)

Co-Investigator(Kenkyū-buntansha) ENDO Satoru  Faculty of Engineering, HIROSHIMA UNIVERSITY, Associate Professor, 工学部, 助教授 (90243609)
TAKADA Jun  Research Institute for Radiation Biology and Medicine, HIROSHIMA UNIVERSITY, Associate Professor, 原爆放射能医学研究所, 助教授 (00274134)
OHTAKI Megu  Research Institute for Radiation Biology and Medicine, HIROSHIMA UNIVERSITY, Professor, 原爆放射能医学研究所, 教授 (20110463)
Project Period (FY) 1998 – 2000
Keywordsatomic bomb / neutron / DS86 / radiation dose / atomic bomb survivor's registry / benchmark test / gamma-ray dose
Research Abstract

Atomic bomb doses for the survivors in Hiroshima and Nagasaki have been estimated according to the Dosimetry system 1986 (DS86), which was approved by the effort of US-Japan joint study. The system was used in Radiation Effects Research Foundation (RERF) and Research Institute for Radiation Biology and Medicine, Hiroshima University (RIRBM) and evaluated organ doses of the survivors in their own cohort study. After the determination of DS86 we found discrepancy between the data obtained from neutron activation data and calculation based on DS86. The discrepancy was found in all of the Eu-152, Co-60, Cl-36 and P-32 data, similarly. The largest discrepancy was found in the Hiroshima data. For example, data are 5 to 10 times larger than DS86 at the 1500 m ground distance. Our study was to find its reason and to get a solution. The problem include (1) problems in data taking process, (2) in neutron transport calculation and (3) in the calculation of the process of explosion and deduced neu … More tron source term. We verified that there were no problems in the data taken at short ground ranges and in the transport calculation. About the data taken at long range may have some problems, since gamma rays measured were very low level? For that problem we made simulation calculation using random numbers and found there may be contamination gamma rays included. From the gold activation and monitoring post data taken at Tokai-mura accident, which recently happened, it was verified that thermal and first neutron data and calculation had good agreement until 2000m ground range. Therefore I considered that the problem is in the neutron source term at Hiroshima atomic bomb. I made many calculation based on the model atomic bomb, which reproduce the Hiroshima type atomic bomb, and found the data and calculation agrees if I assume (1) bottom of the atomic bomb came off as if it had about 3cm parallel spacing, (2) about 90m elevation of the neutron emission height (after the emission bomb fell down 90m and formed fire ball), (3) increase the yield about 20%. US group did not accept such assumptions. However, Dr.Kaul in May 2000 at the workshop held at RERF, agreed that we couldn't adjust the calculation and data without such assumptions. We will have a meeting again this May 2001. US-group promised that they would bring their way to solve the problem. There we will discuss this problem and hope that we will have our whole agreement and that we will obtain new dosimetry system for the atomic bomb survivors. Less

  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Hoshi,M.: "Problems of radiation dose evaluation in Hiroshima and Nagasaki and their explanation"Radiation Protection Dosimetry. 77. 15-23 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 星正治: "広島原爆の中性子およびガンマ線の輸送計算"JAERI-Review. 98-010. 210-222 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shizuma,K.: "Residual ^<60>Co activity in steel samples exposed to the Hiroshima atomic-bomb neutrons"Health Physics. 75. 278-284 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kato,K.: "Radiation therapy among atomic bomb survivors, Hiroshima and Nagasaki"Radiat.Res.. 149. 614-624 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hoshi,M.: "A Crack Model of the Hiroshima Atomic Bomb : Explanation of the Contradiction of "Dosimetry System 1986""J.Radiat.Res.. 40 Suppl.. 145-154 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 星正治: "軟X線の線量測定"医療標準線量. 4(1). 17-22 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 遠藤暁: "C-CO_2電離箱(IC17G)の中性子感度の測定"医療標準線量. 4(1). 29-33 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Endo,S.: "DS86 Neutron Dose : Monte Carlo Analysis for Depth Profile of ^<152>Eu Activity in a Large Stone Sample"J.Radiat.Res.. 40. 169-181 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Endo,S.: "Study of Burst Height and Neutron Emission Height of the Hiroshima Atomic Bomb"広島大学原爆放射能医学研究所年報. 40. 183-194 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hoshi,M.: "Radiocesium in children residing in the western districts of the Bryansk Oblast from 1991-1996"Health Physics. 79. 182-186 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 星正治: "広島原爆の被曝線量評価の問題点"放射線化学. 69. 2-9 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Endo,S.: "Neutron dose equivalent estimation from the specific activity of ^<51>Cr"Journal of Environmental Radioactivity. 50. 89-96 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松浦正明: "原爆被爆者乳ガン死亡の相対リスクの最近の増加に関して"長崎医学会雑誌. 75. 163-167 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hoshi, M.: "Problems of radiation dose evaluation in Hiroshima and Nagasaki and their explanation."Radiation Protection Dosimetry. 77. 15-23 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hoshi, M.: "Neutron transport calculation for the dose evaluation of the Hiroshima atomic bomb."JAERI-Review. 98-010. 210-222 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shizuma, K.: "Residual ^<60>Co activity in steel samples exposed to the Hiroshima atomic-bomb neutron"Health Physics. 75. 278-284 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kato, K.: "Radiation therapy among atomic bomb survivors, Hiroshima and Nagasaki"Radiat.Res.. 149. 614-624 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hoshi, M.: "A Crack Model of the Hiroshima Atomic Bomb : Explanation of the Contradiction of "Dosimetry System 1986""J.Radiat.Res.. 40 Suppl.. 145-154 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hoshi, M.: "Dosimetry of ultrasoft X-rays"Medical Standard Dose. 4(1). 17-22 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Endo, S.: "Neutron sensitivity measurements for C-Co_2 ionization chamber"Medical Standard Dose. 4(1). 29-33 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Endo, S.: "DS86 Neutron Dose : Monte Carlo Analysis for Depth Profile of ^<152>Eu Activity in a Large Stone Sample"J.Radiat.Res.. 40. 169-181 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Endo, S.: "Study of Burst Height and Neutron Emission Height of the Hiroshima Atomic Bomb"Proceedings of RIRBM Hiroshima University. 40. 183-194 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hoshi, M.: "Radiocesium in children residing in the western districts of the Bryansk Oblast from 1991-1996"Health Physics. 79. 182-186 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hoshi, M.: "Problems in dosimetry study in the Hiroshima"Radiological chemistry. 69. 2-9 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Endo, S.: "Neutron dose equivalent estimation from the specific activity of ^<51>Cr"Journal of Environmental Radioactivity. 50. 89-96 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsuura, M.: "On the recent increase of relative cancer mortality among Atomic Bomb Survivors in Hiroshima Prefecture"Nagasaki Med.J.. 75. 163-167 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2002-03-26  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi