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Published on: August 24, 2017
Dosimetry of gamma rays from nitrogen-16 decay
Calcium fluoride thermoluminescence dosimeters (CaF2 TDL) were evaluated for measuring 16N-decay radiation. CaF2 TDL underestimated dose by 1.8x for 7-MeV gamma rays compared to ionization chambers.
Area of Science:
- Nuclear physics
- Radiation detection and measurement
Background:
- 16N-decay radiation is present in nuclear reactor coolant and activated air.
- Accurate measurement of absorbed dose from 16N-decay radiation is crucial for radiation safety and monitoring.
Purpose of the Study:
- To assess the performance of Calcium fluoride thermoluminescence dosimeters (CaF2 TDL) in measuring apparent absorbed dose from 16N-decay radiation.
- To compare the dose measurements of CaF2 TDL with an ionization chamber calibrated using a 60Co source.
Main Methods:
- Utilized CaF2 thermoluminescence dosimeters (TDL) for dose measurement.
- Employed an ionization chamber calibrated with a 60Co source as a reference.
- Compared TDL readings with ionization chamber readings and calculated doses for approximately 7-MeV gamma rays.
Main Results:
- CaF2 TDL underestimated the absorbed dose by a factor of 1.8 for 7-MeV gamma rays.
- The ionization chamber showed a lower reading by a factor of 2.6 when compared to the calculated dose.
Conclusions:
- CaF2 TDL exhibit a systematic underestimation for 7-MeV gamma rays in the context of 16N-decay radiation.
- Ionization chambers also present discrepancies when compared to calculated doses, highlighting the challenges in accurate dosimetry for this radiation type.
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