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Radiation Protection Dosimetry Advance Access originally published online on September 11, 2006
Radiation Protection Dosimetry 2007 123(2):254-256; doi:10.1093/rpd/ncl140
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

TECHNICAL NOTES

Radiophotoluminescence dosimetry using a small spherical glass: a preliminary phantom study

Keiichi Nakagawa1, Kiyoshi Yoda2,*, Takashi Shiraki1, Katsutake Sasaki1, Masanori Miyazawa3, Tatsuyo Ishidoya4, Kuni Ohtomo1 and Minoru Hamada5

1 Department of Radiology, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8655, Japan
2 Elekta K. K., 6-1-9 Isogami-dori, Chuo-ku, Kobe 651-0086, Japan
3 R-TECH Inc., 6-6-39 Akatsuka Itabashi-ku, Tokyo 175-0092, Japan
4 Asahi Techno Glass Corporation, 3583-5 Kawashiri Yoshida-cho, Haibara-gun, Shizuoka 421-0302, Japan
5 Division of Radiation Oncology, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan

* Corresponding author: kyo{at}elekta.co.jp

Received July 13, 2006, amended August 9, 2006, accepted August 17, 2006


  Abstract

A radiophotoluminescence dosimetry has been proposed using a spherical silver-activated phosphate glass with a diameter of 1.5 mm. A 6 MV photon dose of 2 Sv (2 Gy) was delivered to 14 spherical glass samples placed between two solid water phantoms at a depth of 10 cm. The samples were positioned within a 20 x 20 mm2 centred at beam axis to ensure uniform dose absorption. A normalised output from a read-out system was obtained by simultaneously measuring luminescence from a non-irradiated reference and that from an irradiated reference to eliminate background contamination and time-varying fluctuation of the readout system, leading to a normalised standard deviation of 1.8%. A dose up to 3.5 Sv (3.5 Gy) was delivered to three spherical glass samples positioned between two solid water phantoms at a depth of 10 cm. The normalised output increased linearly with the applied dose.


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