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The effects of high absorbed dose on the reusability of CaF2:Mn thermoluminescence dosimeters (TLDs) are investigated to determine a recommended upper limit on absorbed dose for TLDs that are to be reused. This investigation examines degradation in the uniformity of response and changes in sensitivity of a batch of TLDs when exposed to gamma-radiation doses ranging from 1 Gy to 1000 Gy, and confirms earlier work suggesting that CaF2:Mn TLDs should not be reused in applications where cumulative absorbed doses are likely to exceed 100 Gy.
thermoluminescence dosimeter, thermoluminescent dosimeter, CaF, 2, :Mn, TLD, reusability, gamma radiation, photon irradiations, high absorbed dose
Senior Member of Technical Staff, Radiation Metrology Laboratory, Sandia National Laboratories, Albuquerque, NM