Status of the Dosimetry for the Radiation Effects Research Foundation (DS86) (2001) / Chapter Skim
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1. Introduction
1. Introduction
Pages 7-13
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From page 7... ...
Those estimates depend critically on the dosimetry. The estimates of risk are the main basis of our knowledge of the late health effects to be expected in any future population exposed to substantial doses of ionizing radiation.
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From page 8... ...
The shielding databases include models for all survivors with nineparameter shielding and all survivors with globe-data shielding descriptions (Roesch 1987~. Uncertainties were estimated for the shielding and organ environments by calculating fractional standard deviations among the many shielding and phantom environments that had been computed.
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From page 9... ...
Even though the fast-neutron component of the absorbed dose is small, with a high RBE (20-50 at the low neutron doses in question) , the neutron equivalent dose in Hiroshima might not be negligible.
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From page 10... ...
Such uncertainties in the neutron contribution to the absorbed dose have also cast broad suspicion on DS86 for assessing the doses and the risks to the survivors and for deriving the gamma-ray risk estimates from the epidemiological studies at the Radiation Effects Research Foundation (RERF)
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From page 11... ...
The letter recommended a number of actions to be taken to lead to renewed confidence in DS86 or to its revision. These included a review of all existing thermal-neutron measurements by a joint US-Japan team, initiation of 63Ni measurements of fast neutrons (based on radioactivity in Japan and mass spectrometry in the United States)
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From page 12... ...
The present NRC report describes in some detail the current situation with DS86 and recent measurements that give some preliminary indications of results for fast neutrons, and it sets the stage for the subsequent work of the joint US and Japan working groups. UNITED STATES-JAPAN INTERACTIONS The Committee on Dosimetry for the RERF has interacted closely over the years with corresponding colleagues in Japan, and interactions have been fostered by personnel at RERF itself, including Dale Preston, Shiochiro Fujita, and, recently, Harry Cullings.
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From page 13... ...
It also outlines the changes in various physical characteristics relating to DS86 in the last 14 years and encourages the incorporation of the changes into a revised dosimetry system. In the succeeding chapters, the report reexamines aspects of measurement and calculation for the most important radiation-field components of the dosimetry: gamma-ray measurements, thermal-neutron and fast-neutron measurements, dataquality assessment, improvement in parameters of DS86, some features of neutron transport, biological dosimetry at RERF, uncertainty in DS86, and the implications of the foregoing for risk assessment.
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