| Project/Area Number |
22591373
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | Ibaraki Prefectural University of Health Science |
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Principal Investigator |
SATO Hitoshi 茨城県立医療大学, 保健医療学部, 教授 (90285057)
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| Co-Investigator(Renkei-kenkyūsha) |
GOTANDA Rumi (70542281)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 電離箱 / マンモグラフィ / 精度管理 / 医用放射線管理 / 線量評価 / 診療放射線品質保証管理 / 乳腺線量 / 低エネルギーX線 / 線量 / 品質保証 |
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| Research Abstract |
In order to perform accuracy management based on the measurement value of the correct dose in mammography, in dose measurement of the low energy X-rays from mammography equipment , the portable type open-window-ionizationchamber which the characteristic of response does not vary was developed. In order to consider it as a portable type unlike the conventional free -ionization chamber, the shape of a collector electrode and arrangement were considered. The energy dependence and the evaluation of absolutely measurement of experimental model of an ionization-chamber were performed using the dose standard place with the same energy spectrum as the equipment used in mammography screening of X-rays. The linearity of dose rate dependence was good to ～15 mGys-1. In the energy range of the X-rays from tube voltage 23 kV to 110 kV, change of the response of a detector was less than 3 %. Moreover, dark current is 10-14～-15A, and it checked that the stable measurement value was obtained for a long time. The portable type open-window-ionization-chamber developed by a new concept can implement highly accurate and stabilized measurement in case of dose evaluation required for the accuracy management in the mammography equipment currently installed in medical facilities.
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