Development of a simple and precise measuremernt system for the neutron dose distribution around medical linacs
| Project/Area Number |
16K10320
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Radiation science
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
眞正 浄光 首都大学東京, 人間健康科学研究科, 准教授 (20449309)
若林 源一郎 近畿大学, 原子力研究所, 准教授 (90311852)
|
|---|
| Project Period (FY) |
2016-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
|
|---|
| Keywords | ヨウ素含有シンチレータ / 自己放射化法 / CsI / 中性子 / 放射線治療 / CCDカメラ / CsIシンチレータ / 高エネルギーX線治療装置 / 光中性子 / CCD / 生成放射能分布 / 変換係数 / CsI(Tl)シンチーレータ / 生成放射能 / イメージング / 医療放射線防護 / 中性子線量 / 自己放射化 / 分布測定 |
|---|
| Outline of Final Research Achievements |
Neutron intensity distribution on a CsI scintillator plate has been observed by a CCD camera and analyzed by using a “decaying self-activation imaging technique”. The decaying self-activation imaging, which has been proposed recently by our group, is based on the analysis of time variation of specific radio-activities generated and remained inside the CsI plate after the termination of neutron irradiation. The luminance distributions of a CsI plate are recorded every one minute as a series of images by a cooling type CCD camera with a telescope lens in a black box. Then the time variations of luminance of the images are fitted on a “pixel-by-pixel basis” with a multi-exponential function. By this, two components of I-128 and Cs-134m are extracted as the fitting curves. The initial luminance values of individual component of radioactivity, which correspond to the values at the termination of neutron irradiation, are plotted as separate images.
|
| Academic Significance and Societal Importance of the Research Achievements |
近年、放射線医療現場で中性子の発生が懸念される状況が増加してきている。特に、X線治療用加速器から発生する中性子は生物学的効果が著しく大きく、放射線加重係数は10～20に達する。この為、放射線防護の観点からこれらの中性子を検知する技術は重要であると考えられる。
本研究では、中性子によって放射化したヨウ素含有シンチレータの自己発光をCCDカメラで観測することにより、中性子分布を測定するシステムを開発した。 これはCsI等のヨウ素含有シンチレータにI-128(半減期25分)が生成することに着目したものである。これにより、中性子の強度分布情報を簡便かつ高精度で得られる手法が実用化された。
|
Report
(4 results)
Research Products
(30 results)
-
-
-
-
-
-
-
[Journal Article] An application of CCD read-out technique to neutron distribution measurement using the self-activation method with a CsI scintillator plate2016
Author(s)
A.Nohtomi, R.Kurihara, H.Kinoshita, S.Honda, M.Tokunaga, H.Uno, K.Shinsho, G.Wakabayashi, Y.Koba, J.Fukunaga, Y.Umezu, Y.Nakamura, S.Ohga
-
Journal Title
Nuclear Instruments and Methods in Physics Research A
Volume: 382
Pages: 21-23
Related Report
Peer Reviewed
-
[Journal Article] High Sensitive Neutron-detection by using a Self-activation of Iodine-containing Scintillators for the Photo-neutron Monitoring around X-ray Radiotherapy Machines2016
Author(s)
A,Nohtomi, G.Wakabayashi, H.Kinoshita, S.Honda, R.Kurihara, J.Fukunaga, Y.Umezu, Y.Nakamura, S.Ohga, K.Nakamura
-
Journal Title
JPS Conference Proceedings
Volume: 11
Related Report
Peer Reviewed / Open Access
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
