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Neutron Fading Characteristics of Copper Doped Lithium Fluoride (LiF: MCP) Thermoluminescent Dosimeters (TLDs)

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Technical Report

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Uniformed Services University Of The Health Sciences Bethesda United States

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LiF thermo luminescent dosimeters TLDs are used by the United States Navy to record radiation exposure of personnel. The DT -648 has been used for many years and has undergone extensive testing to identify its pre-irradiation and post-irradiation fade operating characteristics. Studies have shown that the addition of copper increases the thermoluminesence sensitivity of the TLD for improved low-level radiation monitoring, which prompted the introduction of theDT-702lPD LiF MCP TLD as a replacement for the DT -648PD LiF MT TLD.4Using current equipment for processing of TLDs and calibrating to National Institute of Standards and Technology NIST standards, this study evaluated the various neutron fading characteristics of the copper-doped dosimeter. The 34week study took place at the Naval Dosimetry Center NDC, Bethesda, Maryland. The TLDs were stored for pre-specified lengths of time according to a34 week schedule to account for realistic fading effects. The TLDs were irradiated to a Plutonium-Beryllium radiation source before and after storing the TLDs.

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