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An individual calibration system for electrometer and ionization chamber of radiotherapy dosimeters
https://repo.qst.go.jp/records/72721
https://repo.qst.go.jp/records/72721d68719a7-2c24-40a4-8acd-efbe1905cb30
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-03-22 | |||||
| タイトル | ||||||
| タイトル | An individual calibration system for electrometer and ionization chamber of radiotherapy dosimeters | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Takase, Nobuhiko
× Takase, Nobuhiko× Sakata, Suoh× Endo, Masahiro× Narita, Katsuhisa× Yamasita, Wataru× Hoteida, Masahiro× Sasaki, Yosuke× Usiroda, Tota× Mizuno, Hideyuki× Fukumura, Akifumi× 佐方 周防× 水野 秀之× 福村 明史 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: Since 2004, Association for Nuclear Technology in Medicine (ANTM) has been carrying out a calibration service for radiotherapy dosimeters, as the unique secondary standard dosimeter laboratory in Japanese external radiotherapy field. The service provides an absorbed dose to water calibration factor to a set of chamber and electrometer, at a single electrometer range. Recently, the authors have established a charge calibration system for electrometer to provide calibration factor at each electrometer range. The new system allows chamber calibration without customer's own electrometers. Method: We assembled a reference standard measurement device of charge with capacitors and a DC voltmeter. Those are traceable to the corresponding national measurement standard. A customer’s reference class chamber can be calibrated with the best relative expanded uncertainty of 1% (k=2) with the new system. Result: We compared the results of electrometer with the calibration factors given in the ADCL’s certificate with A2LA accredited symbol. The calibration factors obtained be the authors and ADCL agreed within the relative expanded uncertainties. The results of ionization chambers also were compared with the calibration factors given in the NMIJ test report. Both factors agreed within relative expanded uncertainties. Conclusion: New calibration system established by the authors has been verified by the two experiments. The individual calibration system for electrometer and chamber would simplify the quality control method of reference dosimeters at radiotherapy facilities. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 8th Japan-Korea Joint Meeting on Medical Physics (114th Scientific Meeting of JSMP) | |||||
| 発表年月日 | ||||||
| 日付 | 2017-09-16 | |||||
| 日付タイプ | Issued | |||||
