Beta Radiation Response of SIRAD® Colorimetric Dosimeter vs. Theoretical Calculation of Beta Dose in the 5 to 25 rad Range
<bold>ABSTRACTSIRAD® family of colorimetric dosimeters has been calibrated to read gamma ray doses in the 1 to 1,000 rad range. Their use has now been established and tested by the Department of Homeland Security (DHS) to meet the DHS specifications for emergency estimation of personal gamma dose. These dosimeters are being distributed in Japan in the hundreds of thousands to citizens, to alleviate concerns about receiving exposures dangerous to health from the emissions of the Fukushima reactors. They have been approved for distribution to responders and citizens in the United States, but so far have been received by only a limited proportion of the U.S. population.The goal of this thesis project is to test the response of SIRAD dosimeters to beta radiation. In order to test the beta response of these colorimetric dosimeters, both the card-size RADTriage and the postage-stamp-size RADSticker dosimeters were exposed for a known number of days in close proximity to the beta radiation emitted from uranium-glazed plates. These plates emit mainly beta radiation, and only a very small amount of gamma or bremmstrahlung x-rays. The numbers of days of exposure for these dosimeters were selected to obtain darkness related to gamma exposures in at least the 5 to 25rad range.The observed human eye readings were then compared to calculated beta ray doses by two methods: 1) calculations using the VARSKIN code and 2) a direct method of calculating the beta ray dose which triply integrates over beta spectra emitted from the uranium glazes. Although results are obtained with a limited number of dosimeters, they do indicate that more detailed experiments will show that the SIRAD families of dosimeters have an adequate response to beta radiation so that they may be used for determining both beta and gamma doses under emergency conditions.<bold>
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Rand, Lindsay (Georgetown University, 2019)There is a need for instantly indicating, easy-to-read, and relatively inexpensive ionizing radiation casualty dosimeters for first responders and members of the general public. One such dosimeter is the RadTriageTM ...