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2022 Fiscal Year Final Research Report

Development of an analytical method for chemical form and radioactivity of medical radioisotope

Research Project

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Project/Area Number 20K08147
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

segawa mariko  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 原子力基礎工学研究センター, 研究職 (00435603)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywords可視化分析
Outline of Final Research Achievements

The alpha radioisotope 211At, which is highly effective in treating refractory malignant tumors (cancer), is produced in accelerators. The activity and chemical form must be analyzed before medical use. However, although 211At has a short half-life of 7.2 hours, the two values have been analyzed separately with a time longer than its half-life, which leads to lose of valuable 211At. In this study, a high-speed, high-sensitivity camera system was constructed to immediately observe the α-rays emitted from 211At at high doses (several hundred mega becquerels or more) at the dosage level, and a technique was developed to analyze the amount and chemical form of 211At produced in a short time.

Free Research Field

可視化分析

Academic Significance and Societal Importance of the Research Achievements

本研究は211Atの可視化による生成量および化学形評価に、即時性と定量性を同時に加え、かつ短時間で分析可能な実用的な技術を開発した点に社会的意義がある。また、出願した2件の特許により、検量線からのずれを簡便に補正して分析の効率化を実現し、さらに薄層クロマトグラフィー中にシンチレーターを含有させることで薄層クロマトグラフィーにより展開中の試料のα線を可視化分析可能となった。両特許は、いづれも分析の効率化に資するものであり、今後のα線治療法の実用化に伴い、貴重なRI治療薬の不要な損失を防ぐとともに、医療従事者の被ばくリスクを低減させる等の高い波及効果が期待できる。

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Published: 2024-01-30   Modified: 2025-01-30  

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