Changes of Optically Stimulated Luminescence Dosimeter Sensitivity with High Dose

Kum Bae Kim; Sang Hyoun Choi; Seungwoo Park; Haijo Jung; Young Hoon Ji; Su Chul Han

doi:10.14316/pmp.2016.27.2.98

Journal List > Prog Med Phys > v.27(2) > 1098520

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Kim, Choi, Park, Jung, Ji, and Han: Changes of Optically Stimulated Luminescence Dosimeter Sensitivity with High Dose

Original Article

Progress in Medical Physics 2016;27(2):98-104.

Published online: 20 June 2016

DOI: https://doi.org/10.14316/pmp.2016.27.2.98

Changes of Optically Stimulated Luminescence Dosimeter Sensitivity with High Dose

Kum Bae Kim^∗,^‡, Sang Hyoun Choi^†,^‡, Seungwoo Park^†, Haijo Jung^∗, Young Hoon Ji^∗,^†,^‡, Su Chul Han^∗,^†

^∗Radiological & Medico-Oncological Sciences, University of Science and Technology, Daejeon, Korea

^†Division of Medical Radiation Equipment, Seoul, Korea

^‡Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea

Correspondence: Young Hoon Ji (jyh328@kirams.re.kr) Tel: 82-2-970-1371, Fax: 82-2-970-2462

Received 22 June 2016 Accepted 23 June 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Keywords: Optically stimulated luminescence dosimeter sensitivity, High dose, Co-60

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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).

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.

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.

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.

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.

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).

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