Technical aspects of the Naval Dosimetry Center quality assurance programme

John, Thelma; Cassata, James; Blake, P. K.; Wallace, W. Hamish B.; Minniti, Ronaldo

doi:10.1093/rpd/nci681

Cited by 4 publications

(2 citation statements)

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“…Loss of functionality was considered to have occurred if the ratio of the measured dose to the irradiated dose was greater than 5% (St John et al, 2006). A total of 60 TLDs were irradiated to 0.05 Sv, 0.15 Sv, and 0.25 Sv.…”

Section: Experimental Facilities and Test Plansmentioning

confidence: 99%

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The High Dose Response and Functional Capability of the DT-702/Pd Lithium fluoride Thermoluminescent Dosimeter

Lawlor

Talmadge²,

Murray³

et al. 2015

Health Physics

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The United States Navy monitors the dose its radiation workers receive using the DT-702/PD thermoluminescent dosimeter, which consists of the Harshaw 8840 holder and the four-element Harshaw 8841 card. There were two main objectives of this research. In the first objective, the dosimeters were exposed to 100 Gy using electron and x-ray beams and found to respond approximately 30-40% lower than the delivered dose. No significant effect on the under-response was found when dose rate, radiation type, dosimeter position on the phantom, and dosimeter material were varied or when the card was irradiated while enclosed in its holder. Since the current naval policy is to remove from occupational use any thermoluminescent dosimeter with an accumulated deep dose equivalent of 0.05 Sv or greater, the functionality of the dosimeter was also investigated at deep dose equivalents of 0.05, 0.15, and 0.25 Sv using 60Co and 137Cs sources as the second main objective. All dosimeters were annealed following exposure and then exposed to 5.0 mSv from a 90Sr source. In all cases, the dosimeters responded within 3% of the delivered dose, indicating that the dosimeters remained functional as defined by naval dosimetry requirements. However, the anneal time required to clear the thermoluminescent dosimeter's reading was found to increase approximately as the cube root with the delivered dose.

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Section: Experimental Facilities and Test Plansmentioning

confidence: 99%

“…INTRODUCTION THE U.S. Navy has been monitoring personnel's radiation exposure since 1946 (St John et al 2006). The Naval Dosimetry Center (NDC) is responsible for maintaining the exposure records of naval personnel.…”

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confidence: 99%