Prog Med Phys.  2016 Jun;27(2):98-104. 10.14316/pmp.2016.27.2.98.

Changes of Optically Stimulated Luminescence Dosimeter Sensitivity with High Dose

• Han SC
• Kim KB
• Choi SH
• Park S
• Jung H
• Ji YH

• KMID: 2328195
• DOI: http://doi.org/10.14316/pmp.2016.27.2.98

Abstract

We investigated the effect of high dose on the sensitivity of optically stimulated luminance dosimeters (OSLDs) on Co-60 gamma rays and used a commercial OLSD (Landauer, Inc., Glenwood, IL). New OSLDs were chosen arbitrarily and were irradiated with 1 Gy repeatedly. We confirmed the change in the radiation sensitivity after repeated irradiation. The OSLD sensitivity increased up to 3% after irradiating for seven times and decreased continuously after the eighth time. It dropped by approximately 0.35 Gy per irradiation. Finally, after irradiating for 30 times, the OSLD sensitivity decreased by approximately 7%. When the OSLDs were irradiated 10 times with 1 Gy after their irradiation using a high dose of 15 Gy and 30 Gy, their sensitivity decreased by 6% and 12%, respectively, compared to that before high-dose irradiation. The change in the OSLD sensitivity with a high dose could be modeled by an exponential equation. We confirmed the radiation sensitivity variation caused by a high dose, and the irradiation history of dosimeters was considered to reuse OSLDs irradiated with a high dose.

Keyword

Optically stimulated luminescence dosimeter sensitivity; High dose; Co-60

MeSH Terms

Gamma Rays
Luminescence*
Radiation Tolerance

Figure

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  Fig. 1. The value of batch sensitivity (a) and coefficient of variation (b) about reproducibility in sampled OSLDs to evaluate change of OSLD sensitivity with high dose. The dotted line was ±1.5% in Fig. 1(a).

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  Fig. 2. The change of relative radiation sensitivity by repeated irradiation with 1 Gy. The dotted line was ±3%, Each data point is the average response of three individual dosimeters.

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  Fig. 3. The change of relative radiation sensitivity by repeated irradiation with 1 Gy, according to optical annealing time. Each data point is the average response of three individual dosimeters.

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  Fig. 4. The change of relative radiation sensitivity of high dose irradiated OSLDs by repeated irradiation with 1 Gy. Each data point is the average response of three individual dosimeters.

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  Fig. 5. The change of residual count of high dose irradiated OSLDs by repeated irradiation with 1 Gy. Each data point is the average response of three individual dosimeters.

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  Fig. 6. OSLD radiation sensitivity as a function of dose by high dose irradiation. Each data point is the average response of three individual dosimeters. Count/dose was radiation sensitivity (eq. 1).

Reference

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