[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols]

[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols] Research Abstract Details 

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[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols] Abstract Text:

Tatsuya Fujisaki,Takeshi Hiraoka,Atsushi Osawa,Masaru Nakajima,Akio Kuwabara,Koichi Yokoyama,Hidetoshi Saitoh,Teizo Tomaru,Tetsuo Inada,

The Japan Society of Medical Physics (JSMP) has published a new dosimetry protocol "JSMP-01" (standard dosimetry of absorbed dose in external beam radiotherapy) which conforms to the recommendations of the International Atomic Energy Agency (IAEA TRS-398) and the American Association of Physicists in Medicine (AAPM TG-51) protocols for the calibration of radiotherapy beams. Since the new protocol offers the physical data for the Famer-type ionization chambers of the various wall materials, the user can measure the absorbed dose at reference point (D(r)) using most of the commercially available Famer-type ionization chambers. In this paper, the six Famer-type ionization chambers of the various wall materials are examined for photon beam by two ways. To verify the JSMP-01 protocol as the first way, D(r) was cross-measured based on the JSMP-01 protocol using a Farmer-type ionization chamber of the acrylic wall material which is called "JARP-chamber" and the Farmer-type ionization chambers of the various wall materials, and compared. To compare the basic data in previous and new protocols as the second way, D(r) was measured based on the previous protocol (JSMP-86) and the JSMP-01 protocol using the Farmer-type ionization chambers of the various wall materials. Dose calculation was made using common exposure calibration factor for (60)Co gamma-rays (Nc) for each of the Farmer-type ionization chambers. Measurement was made with each ionization chamber for 6 and 10 MV photon beams in two facilities. D(r) were found to agree to that of JARP-chamber within about +/- 1% despite significant differences of ratio of calibration factor (k(D,X)) and beam quality conversion factor (k(Q)) for photon beams. The ratios JSMP-01/JSMP-86 of the reference dose were found to lie on between 0.999 and 1.004 for 6 MV and on between 0.999 and 1.005 for 10 MV depending upon the Farmer-type ionization chambers used. The largest discrepancies between the previous and new protocols arise from the use of different data of k(D,x) x k(Q) and C(lambda) for the absorbed dose conversion factors of each ionization chamber.

[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols] Publishing Authors By Initials

T Fujisaki,T Hiraoka,A Osawa,M Nakajima,A Kuwabara,K Yokoyama,H Saitoh,T Tomaru,T Inada,

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[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols] Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Igaku butsuri : Nihon Igaku Butsuri Gakkai kikansh

VOLUME: 24

Page Numbers: 13-20

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ISSN: 1345-5354

DAY: 30

MONTH: 06

YEAR: 2004

[Absorbed dose measurement of photon beam with Farmer-type ionization chambers in Japanese dosimetry protocols] Information

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LANGUAGE: jpn

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AFFILIATION: Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan. hujisaki@ipu.ac.jp

Country: Japan

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MEDLINETA: Igaku Butsuri

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