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Executive Summary
Pages 1-6

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From page 1...
... Major components of the radiation field include prompt and delayed neutrons as well as early and late gamma rays (Roesch 1987~. Uncertainty in DS86 estimates of organ dose was provisionally discussed by Roesch (1987)
From page 2...
... This report describes the status of DS86 specifically, the discrepancies that should be investigated, some of the approaches recommended to remedy them, and some preliminary results. GAMMA-RAY MEASUREMENTS When DS86 was adopted, the main component of the dose, gamma rays, had been directly measured by thermoluminescence in quartz that was inside bricks and tiles in structures up to about 2 km from the hypocenter in both cities.
From page 3...
... BIOLOGICAL DOSIMETRY Biological dosimetry is not generally expected to achieve the detailed precision of good physical measurements, but biological assays can provide a sound perspective on whether the physical dosimetry has led to reasonable results. They can be used to test the dosimetry system and provide evidence to confirm DS86 or to suggest the presence of a problem.
From page 4...
... DS86 included a preliminary assessment of these uncertainties. The assessment was based on fractional standard deviations estimated for various key parameters and on nonparametric methods derived mainly from the judgment of the DS86 authors, with little analytical support.
From page 5...
... However, so many other complex factors are involved in differences between the two cities, including terrain and shielding, that it is highly questionable whether that difference can be attributed solely to the neutrons. If the neutron component is actually larger in Hiroshima than in DS86 for example,3 times larger at 1500 m it would imply an even greater proportion of the effect for neutrons and less for gamma rays.
From page 6...
... · A complete evaluation of uncertainty in all stages of the revised dosimetry system should be undertaken and become an integral part of the new system. · The impact of the neutron contribution on gamma-ray risk estimates in the new system should be determined.


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