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8. Conclusions and Recommendations
Pages 95-98

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From page 95...
... but have tended to become worse for Hiroshima with the addition of 36C1 thermal-neutron activation measurement techniques, possibly amounting to thermal-neutron fluence 1500 m from the epicenter greater by a factor of almost 10 than calculated in DS86. Determined efforts in the last few years to establish the magnitude of the "neutron problem" and to explain it by examining critically the uncertainties in the measurements themselves have not resulted in definitive conclusions.
From page 96...
... Future measurements should include secondary-reference standard reagents and analytical blanks, and when it is appropriate, an isotopic tracer should be processed with each field sample. Preliminary results of the 63Ni fast-neutron measurements suggest that the discrepancy in Hiroshima is smaller (perhaps a factor of 3-5, not a factor of 10, at 1500 m)
From page 97...
... The committee offers the following recommendations regarding the revision of DS86 that is clearly needed and that hopefully will be completed in 2002: · The present program of 63Ni measurements should be pursued to completion. · All thermal-neutron activation measurements, particularly those with 36C1 and i52Eu, should be reevaluated with regard to uncertainties and systematic errors, especially background (see Chapter 3~.
From page 98...
... Comparisons of activation measurements with calculations of activation based on DSS6-calculated fluences indicate additional bias in kerma estimates due to a systematic bias in free-field neutron transport. This systematic bias, unlike most of the systematic errors discussed above, appears to depend on the distance from the epicenter.


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