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arXiv · 1303.1608

High-dose high-temperature emission of LiF:Mg,Cu,P: thermally and radiation induced loss & recovery of its sensitivity

Barbara Obryk·Katarzyna Skowrońska·Anna Sas-Bieniarz·Liliana Stolarczyk·Paweł Bilski
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Abstract

Highly sensitive LiF:Mg,Cu,P (MCP) detectors enable measurements of radiation doses from tens of nanograys up to a few kilograys, where the saturation of the signal of the main dosimetric peak occurs. Thanks to the recently observed high-dose high-temperature emission of MCP detectors heated to temperatures up to 600°C after exposures to radiation doses ranging from 1 kGy to 1 MGy, a new method of TL measurement of radiation doses has been recently developed at the Institute of Nuclear Physics (IFJ). This method can measure doses ranging from micrograys up to a megagray. So far, high dose measurements were performed on fresh MCP samples and each detector was used only once, because as a result of these measurements, the detectors lose their sensitivity to a large extent. In this study, a specific thermal treatment intended to fully restore the loss of MCPs TL sensitivity was sought. We have investigated several annealing procedures, applying different temperatures (from 400°C up to 700°C) for different periods of time (10-30 minutes) in argon atmosphere. In this way we were able to recover MCP sensitivity fully, allowing for reuse of the samples after high-dose irradiation and high-temperature measurement.

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Barbara Obryk, Katarzyna Skowrońska, Anna Sas-Bieniarz, Liliana Stolarczyk, Paweł Bilski. 2013-03-15. High-dose high-temperature emission of LiF:Mg,Cu,P: thermally and radiation induced loss & recovery of its sensitivity. https://doi.org/10.1016/j.radmeas.2013.02.020

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