Study on Dosimetric Properties of Radiophotoluminescent Glass Rod Detector

유리선량계의 선량 특성에 관한 연구

  • Rah, Jeong-Eun (Dept. of Biomedical Engineering, College of Medicine, Catholic University) ;
  • Shin, Dong-Oh (Dept. of Radiation Oncology, College of Medicine, Kyung Hee University) ;
  • Hong, Ju-Young (Dept. of Biomedical Engineering, College of Medicine, Catholic University) ;
  • Kim, Hee-Sun (Radiation Health Research Institute) ;
  • Lim, Chun-Il (Radiation Standards Division, Korea Food & Drug Administration) ;
  • Jeong, Hee-Gyo (Medical Devices Standardization Division, Korea Food & Drug Administration) ;
  • Suh, Tea-Suk (Dept. of Biomedical Engineering, College of Medicine, Catholic University)
  • 라정은 (가톨릭의대 의공학교실) ;
  • 신동오 (경희의대 방사선종양학교실) ;
  • 홍주영 (가톨릭의대 의공학교실) ;
  • 김희선 (한국수력원자력(주) 방사선보건연구원) ;
  • 임천일 (식품의약품안전청 방사선표준과) ;
  • 정희교 (식품의약품안전청 의료기기규격과) ;
  • 서태석 (가톨릭의대 의공학교실)
  • Published : 2006.12.30

Abstract

A radiophotoluminescent glass rod detector (GRD) system has recently become commercially available. We investigate the dosimetric properties of the GRD regarding the reproducibility of signal, dose linearity and energy dependence. The reproducibility of five measurements for 50 GRDs is presented by an average of one standard deviation of each GRD and it is ${\pm}1.2%$. It is found to be linear in response to doses of $^{60}Co$ beam in the range 0.5 to 50 Gy with a coefficient of linearity of 0.9998. The energy dependence of the GRD is determined by comparing the dose obtained using cylindrical chamber to that by using the GRD. The GRD response for each beam is normalized to the response for a $^{60}Co$ beam. The responses for 6 and 15 MV x-ray beams are within ${\pm}1.5%$ (1SD). The energy response of GRD for high-energy photon is almost the same as the energy dependence of LiF:Mg:Ti (TLD-100)and shows little energy dependence unlike p-type silicon diode detector. The GRDs have advantages over other detectors such diode detector, and TLD: linearity, reproducibility and energy dependency. It has been verified to be an effective device for small field dosimetry for stereotactic radiosurgery.

References

  1. Heydarian M, Hoban PW, and Beddoe AH. A comparison of dosimetry techniques in stereotactic radiosurgery. Phys. Med. Biol. 1996;41:93-110 https://doi.org/10.1088/0031-9155/41/1/008
  2. Lee HR, Pankuch M, Chu JC, and Spokas JJ, Evaluation and characterization of parallelplate microchamber's functionalities in small beam dosimetry. Med. Phys. 2002;29:2489-2496 https://doi.org/10.1118/1.1514576
  3. Kubo HD, and Araki F. Dosimetry and mechanical accuracy of the first rotating Gamma-Knife system installed in North America. Med. Phys. 2002;29:2497-2505 https://doi.org/10.1118/1.1514039
  4. Rickner G, and Grusell E. Selective shielding of a p-Si detector for quality independence. Acta Radiol. Oncol. 1985;24:65-69 https://doi.org/10.3109/02841868509134367
  5. Rickner G. Characteristic of a selectively shield p-Si detector in $^{60}Co$ and 8 and 16 MV x-ray radiation. Acta Radiol. Oncol. 1985;24:205-208 https://doi.org/10.3109/02841868509134388
  6. Mobit PN, Nahum AE, and Mayles P. A Monte Carlo study of the quality dependence factors of common TLD materials in photon and electron beams. Phys. Med. Biol. 1998;43:2015-2032 https://doi.org/10.1088/0031-9155/43/8/002
  7. Araki F, Ikegami T, Ishidoya T, and Kubo DH. Measurements of Gamma-Knife helmet output factors using a radiophotoluminescent glass rod dosimeter and a diode detector. Med. Phys. 2003;30:1976-1981 https://doi.org/10.1118/1.1587451
  8. Tsuda M. A few remarks on photoluminescence dosimetry with high energy x-rays. Jpn. J. Med. 2000;20:131-139
  9. Asahi Techno Glass Corporation. Explanation material of RPL glass dosimeter: Small element system. Tokyo. Japan. 2000
  10. TRS No 277, Absorbed dose determination in photon and electron beams. An International Code of Practice for Dosimetry. IAEA. Vienna: 1983
  11. Mobit PN, Mayles P, and Nahum AE. The quality dependence of LiF TLD in megavoltage photon beams: Monte Carlo simulation and experiments. Phys. Med. Biol. 1996;41:387-398 https://doi.org/10.1088/0031-9155/41/3/004
  12. Mobit PN, Nahum AE and Mayles P. The energy correction factor of LiF thermoluminecent dosimeters in megavoltage electron beams: Monte Carlo simulation and experiments. Phys. Med. Biol. 1996;41:979-993 https://doi.org/10.1088/0031-9155/41/6/003