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Acceptance Testing of Thermoluminescent Dosimeter Holders
Health Physics
|March 27, 2018
Summary
A new Navy procedure verifies dosimeter filters, detecting errors like double copper filters. These filter defects can cause failures in high-energy beta radiation proficiency testing.
Area of Science:
- Radiation dosimetry
- Materials science
Background:
- The U.S. Navy utilizes the Harshaw 8840/8841 dosimetric system with LiF:Mg,Cu,P thermoluminescent dosimeters (TLDs).
- Dosimeter holders contain unique filters (copper, ABS, Mylar®, tin) for each element.
- ISO/IEC 17025:2005(E) mandates acceptance procedures for new dosimetry equipment.
Purpose of the Study:
- To develop and test a non-destructive procedure for verifying embedded filters in TLD holders.
- To ensure the correct filter type and thickness are present in the dosimeters.
- To evaluate the impact of filter nonconformities on dosimetry system performance.
Main Methods:
- Developed a non-destructive procedure using low-energy radiation attenuation measurements.
- Tested filters by comparing measured response ratios with expected ratios.
- Assessed individual element responses against the group mean response.
Main Results:
- The procedure successfully identified nonconformities, including a holder with a double copper filter.
- Filter defects were found to impact proficiency testing outcomes.
- Failures in proficiency testing categories III and IV occurred with high-energy beta irradiation.
Conclusions:
- The developed procedure effectively verifies TLD filter integrity.
- Filter nonconformities can compromise dosimetry accuracy, particularly under specific radiation conditions.
- Ensuring filter accuracy is critical for reliable personnel dosimetry in Navy applications.
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