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放射線防護線量測定のための実用量に関するICRUの検討状況

Status of discussion in ICRU on operational quantities for radiation protection

遠藤 章  

Endo, Akira

国際放射線単位測定委員会(ICRU)は、国際放射線防護委員会(ICRP)により勧告された実効線量などの防護量を評価するために、線量測定に用いる実用量を定義している。現在、国際的に利用されている実用量は、1980年代に定められたものである。ICRUレポート委員会26は、防護量の定義の変更や被ばく状況の多様化を考慮して、実用量を見直す検討を進めてきた。この検討では、作業者と公衆に被ばくをもたらす放射線の種類とエネルギー範囲の拡張を考慮に入れ、現在の実用量の問題点を分析し、その結果、新たな実用量を提案することにした。本発表では、実用量の見直しに至った背景、新たに提案する実用量の内容とそれが放射線測定機器の設計や校正、測定の実務に及ぼす影響について述べる。

The International Commission on Radiation Units and Measurements (ICRU) defines a set of operational quantities for use in radiation measurements that provides assessment of the protection quantities recommended by International Commission for Radiological Protection (ICRP). The ICRU operational quantities in current use was defined in 1980s. ICRU Report Committee 26 has examined the rationale for operational quantities taking into account the changes in the definitions of the protection quantities and the changes in the fields of application of the operational quantities. The considerations have included the range of types and energies of particles contributing to doses to workers and members of the public. Based on the analysis, the committee has proposed a set of operational quantities which differs from the previous quantities. This presentation describes an overview of ICRU Report Committee 26's discussion on the definitions, deficiencies, and limitations of the current system, and its proposals for an alternative system of operational quantities.

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