| Item type |
文献 / Documents(1) |
| 公開日 |
2017-09-14 |
| アクセス権 |
|
|
アクセス権 |
open access |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版社版DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1007/s12194-016-0352-7 |
| 出版タイプ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| タイトル |
|
|
タイトル |
Practical method for determination of air kerma by use of an ionization chamber toward construction of a secondary X-ray field to be used in clinical examination rooms |
|
言語 |
en |
| 著者 |
マエハタ, イツミ
林, 裕晃
キモト, ナツミ
タケガミ, カズキ
オキノ, ヒロキ
金澤, 裕樹
富永, 正英
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
We propose a new practical method for the construction of an accurate secondary X-ray field using medical diagnostic X-ray equipment. For accurate measurement of the air kerma of an X-ray field, it is important to reduce and evaluate the contamination rate of scattered X-rays. To determine the rate quantitatively, we performed the following studies. First, we developed a shield box in which an ionization chamber could be set at an inner of the box to prevent detection of the X-rays scattered from the air. In addition, we made collimator plates which were placed near the X-ray source for estimation of the contamination rate by scattered X-rays from the movable diaphragm which is a component of the X-ray equipment. Then, we measured the exposure dose while changing the collimator plates, which had diameters of 25–90 mmϕ. The ideal value of the exposure dose was derived mathematically by extrapolation to 0 mmϕ. Tube voltages ranged from 40 to 130 kV. Under these irradiation conditions, we analyzed the contamination rate by the scattered X-rays. We found that the contamination rates were less than 1.7 and 2.3 %, caused by air and the movable diaphragm, respectively. The extrapolated value of the exposure dose has been determined to have an uncertainty of 0.7 %. The ionization chamber used in this study was calibrated with an accuracy of 5 %. Using this kind of ionization chamber, we can construct a secondary X-ray field with an uncertainty of 5 %. |
|
言語 |
en |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Ionization chamber |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Air kerma |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Contamination rate |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Scattered X-rays |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Diagnostic X-ray equipment |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Secondary X-ray field |
| 書誌情報 |
en : Radiological Physics and Technology
巻 9,
号 2,
p. 193-201,
発行日 2016-03-18
|
| 収録物ID |
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|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
18650333 |
| 収録物ID |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
18650341 |
| 収録物ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA12236881 |
| 出版者 |
|
|
出版者 |
Springer Japan |
|
言語 |
en |
| 備考 |
|
|
言語 |
ja |
|
値 |
The final publication is available at Springer via http://dx.doi.org/10.1007/s12194-016-0352-7. |
| 権利情報 |
|
|
言語 |
en |
|
権利情報 |
Copyright © Japanese Society of Radiological Technology and Japan Society of Medical Physics 2016 |
| EID |
|
|
識別子 |
306432 |
|
識別子タイプ |
URI |
| 言語 |
|
|
言語 |
eng |
rpt_9_2_193.pdf (1.49 MB)
