輝尽性蛍光体プレートを用いて取得したX線画像上の黒点発生の解明に向けたモンテカルロシミュレーション

• 林 裕晃

  徳島大学大学院ヘルスバイオサイエンス研究部

• 西原 貞光

  徳島大学大学院ヘルスバイオサイエンス研究部

• 谷内 翔

  徳島大学医学部保健学科

• 神谷 尚武

  徳島大学医学部保健学科

書誌事項

タイトル別名

• Monte-Carlo simulation to clarify the appearance of black spots on the radiographic image stored by the phosphor plate
• ~the effect of massive fission yielded nuclei diffused by the accidents of nuclear power plants~
• ～原子力発電所事故で飛散した核分裂収率の大きい放射性同位元素の影響～

抄録

Caused by an accident of nuclear power plants at Fukushima in March 2011, many radioisotopes were spread to the environment. In medical front, the black spots were appeared on the radiographic image stored by the phosphor plate and they had a negative impact on the diagnostic imaging. The aim of this study is to simulate the effect of the emitted radiation(β-rays and/or γ-rays)on the luminescence of the photostimulable phosphor, and to evaluate the most effective RI to produce the black spots. We focused attention to the five nuclides(⁹⁰Sr-⁹⁰Y, ¹³¹I, ¹³⁴Cs, ¹³⁷Cs), and contributions for appearance of the black spots were calculated. In the simulation, the β-rays and γ-rays of each nuclide were individually estimated. As a result, we found that the contribution of β-rays was much larger than that of the γ-rays. Moreover, we considered about the main nuclei to produce the black spots based on the simulated results and the measured data by MEXT(Ministry of Education, Culture, Sports, Science and Technology). In the case in which RI was directly adhered on the phosphor plate, the β-ray emitted from ¹³⁷Cs was main cause. In the other case in which RI was attached at the supporting equipments(cassette etc.), the γ-ray emitted from ¹³⁴Cs was main cause.

収録刊行物

• 医用画像情報学会雑誌

  医用画像情報学会雑誌 29 (1), 7-11, 2012

  医用画像情報学会

キーワード

• Monte-Carlo simulation
• EGS5
• black spots
• phosphor plate

詳細情報

• CRID: 1390282679628558080
• NII論文ID: 130002069263
• DOI: 10.11318/mii.29.7
• ISSN: 18804977
• ISSN: 09101543
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可