Download Status of the Dosimetry for the Radiation Effects Research by National Research Council, Division on Earth and Life PDF
By National Research Council, Division on Earth and Life Studies, Board on Radiation Effects Research, Committee on Dosimetry for the Radiation Effects Research Foundation
The Committee on Dosimetry for the Radiation results examine origin (RERF) was once arrange greater than a decade in the past on the request of the U.S. division of power. It used to be charged with tracking paintings and experimental effects regarding the Dosimetry method 1986 (DS86) utilized by RERF to reconstruct the radiation doses to the survivors in Hiroshima and Nagasaki. on the time it used to be verified, DS86 used to be believed to be the easiest on hand dosimetric approach for RERF, yet questions have continued approximately a few good points, in particular the estimates of neutrons caused by the Hiroshima bomb. This booklet describes the present scenario, the gamma-ray dosimetry, and such dosimetry matters as thermal-neutron discrepancies among dimension and calculation at quite a few distances in Hiroshima and Nagasaki. It recommends techniques to deliver these concerns to closure and units the level for the lately convened U.S. and Japan operating teams that might increase a brand new dosimetry for RERF. The booklet outlines the alterations when it comes to DS86 some time past 15 years, equivalent to better numbers that move into, and are a part of, extra subtle calculations for identifying the radiations from bombs that stretch definite distances in air, and encourages incorporation of the alterations right into a revised dosimetry method.
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Additional info for Status of the Dosimetry for the Radiation Effects Research Foundation (DS86)
Sample text
Since Straume and others reported the apparent discrepancy in thermal-neutron activation calculations at Hiroshima, numerous studies have attempted to explain the lack of agreement. The present committee has examined all the proposed solutions and some new data that have become available since the original publication by Straume and others (1992). The committee and its consultants have examined the various measurement data in great detail to determine whether part or all of the disagreement could be due to measurement errors (including failure to account properly for background contribution) and to determine better the exact extent of the potential discrepancy in calculated DS86 neutron fluence as a function of distance.
The residuals shown in Figures 2-15 and 2-17 represent the combined effects of errors, both systematic and random, in the DS86 estimates and in the measurements. Roughly stated, the relative magnitude of these combined errors is about 20% for comparatively high doses and about 100% for the natural background component, that is at 2000 m on the ground in Hiroshima. Nevertheless, the test of residuals indicates that because a reduction of 20% does not improve agreement between calculation and measurement, the agreement, fortuitously perhaps, might be to within about ±10%.
However, the data have not been corrected to free-field values. The DS86 values are free-field estimates, so the difference between measured and calculated activation is probably larger than shown in the figure. Only a few preliminary 63Ni measurements are available, but they suggest (see Figure 3-4) that the discrepancy for higher-energy neutrons is smaller than that for thermal neutrons; this perhaps reflects systematic uncertainty in the calculation of thermal activation at the more distant sites.