Usefulness of thermoluminescent sheet for measurement of dose distribution near radioactive sources

Kazuro Iwata; Hitoshi Yoshimura; Toshiaki Tamada; Hajime Ohishi; Hideo Uchida; Masuo Nakagawa; Koh Utsunomiya; Isao Yamamoto; Tomonori Wada

doi:10.1117/12.144716

18 May 1993 Usefulness of thermoluminescent sheet for measurement of dose distribution near radioactive sources

Kazuro Iwata, Hitoshi Yoshimura, Toshiaki Tamada, Hajime Ohishi, Hideo Uchida, Masuo Nakagawa, Koh Utsunomiya, Isao Yamamoto, Tomonori Wada

Author Affiliations +

Proceedings Volume 1885, Advances in Fluorescence Sensing Technology; (1993) https://doi.org/10.1117/12.144716
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

A thermoluminescent sheet (TL sheet) for in vivo measurement of spatial dose distribution near small radioactive sources (mm) and its digital readout system have been developed. The TL sheet, the size of which is 40 cm X 50 cm X 0.2 mm, is a teflon homogeneously mixed with BaSO₄:Eu doped powder of about 5 micrometers . This thin TL sheet is very flexible and can be cut to the desired size and form. The sheet was insensitive to room-light, so it is easy to handle. The sheet was found to have a linear response with a very wide dynamic range from at least 0.002 cGy to 5000 cGy absorbed dose. The spatial resolution of the TL sheet was 62 micrometers corresponding to 8.1 line pairs/mm. These are suitable to measure the in vivo spatial dose distribution near sources because large dose gradients exist over a small area. For intracavitary radiation therapy of a rectal cancer, the in vivo dose distribution on the surface of the cancer was determined with the TL sheet. This TL sheet may provide a convenient means of measuring the dose distribution of various patterns in radiation therapies.

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Kazuro Iwata, Hitoshi Yoshimura, Toshiaki Tamada, Hajime Ohishi, Hideo Uchida, Masuo Nakagawa, Koh Utsunomiya, Isao Yamamoto, and Tomonori Wada "Usefulness of thermoluminescent sheet for measurement of dose distribution near radioactive sources", Proc. SPIE 1885, Advances in Fluorescence Sensing Technology, (18 May 1993); https://doi.org/10.1117/12.144716

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