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A separated calibration system for therapy level dosimeter by ANTM
https://repo.qst.go.jp/records/74844
https://repo.qst.go.jp/records/74844d3ad6255-3a8e-4a34-82df-ebb30a6d1705
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-03-19 | |||||
| タイトル | ||||||
| タイトル | A separated calibration system for therapy level dosimeter by ANTM | |||||
| 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 |
Sakata, Suoh
× Sakata, Suoh× 高瀬, 信宏× 山下, 航× 遠藤, 真広× Sasaki, Yosuke× Hoteida, Masahiro× Okuyama, Hiroaki× Ushiroda, Tota× Mizuno, Hideyuki× Narita, Katuhisa× 福村, 明史× Sakata, Suoh× Takase, Nobuhiro× Yamashita, Wataru× Endo, Masahiro× Mizuno, Hideyuki× Fukumura, Akifumi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: In the separated calibration, the ionization chamber and electrometer constituting the dosimeter are calibrated individually, and calibration coefficient is given for each. This method has some advantages for both the calibration laboratory and users. In 2018, the Association for Nuclear Technology in Medicine (ANTM) has started a separated calibration organization. Methods: The main equipment used in calibration system are standard electrometer and standard electric charge source. The standard electrometer self-calibrates the sensitivity with a standard capacitor and a DC voltage source inserted in the negative feedback circuit of the electrometer. Both the standard capacitor and the DC voltage source are calibrated by the National Metrological Institute of Japan. The standard charge source was assembled from a DC current generator and a current shutter controlled by a timer. This charge source can be calibrated by reading the charge generated with the standard electrometer. Results: The calibration coefficient of user’s electrometer, kelec is determined using charges supplied from standard charge source and readings of electrometer. The uncertainty of kelec is 0.078% in the range of 2-200 nC. In the calibration of user’s ionization chamber, the chamber is installed in the gamma ray standard field and connected to the standard electrometer. The water absorbed dose calibration coefficient, ND,w is decided by comparing the standard field output with the standard electrometer reading. Conclusions: In Japan, it has been possible to calibrate the ionization and electrometer separately. The improvement of uncertainty and redundancy are expected in therapeutic lever dosimetry. |
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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 | 18th Asia-Oceania Congress of Medical Physics (AOCMP) & 16th South-East Asia Congress of Medical Physics (SEACOMP) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-11-14 | |||||
| 日付タイプ | Issued | |||||
