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放射性同位体熱電発電機を含む放射線事故のシミュレーション

Fernanda Q Fuzato¹, Victor L O Evangelista¹, Felipe B Cruz²

¹Institute of Physics, Federal University of Uberlândia, Uberlândia, MG, Brazil; Graduate Program in Biomedical Engineering, FEELT, Federal University of Uberlândia, Uberlândia, MG, Brazil.

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まとめ

放射性同位体熱電発電機 (RTG) は,破損した場合に重大な放射線リスクを伴います. シミュレーションではストロンチウム90の源が暴露されると投与量が大幅に増加し強力なシールドと安全プロトコルの必要性を強調しています

科学分野:

核工学
放射線安全
医学物理学

背景:

放射性同位体熱電発電機 (RTG) は,放射性崩壊熱を電気として利用し,しばしばストロンチウム-90を使用します.
RTGは遠隔地に配備されていてメンテナンスの必要は少ないが封じ込めが破られれば危険性があります
ジョージア州リアの事故のようなRTGを伴う事故は深刻な放射線被曝の可能性を強調しています

研究の目的:

BETA-M型RTGからの放射線量を,無傷状態と破損状態で定量化する.
モンテカルロシミュレーションを用いてRTG事故における個体に対する生物学的リスクを評価する.
ジョージア州リアのRTG事故に関連する放射線被曝シナリオの洞察を提供するためです.

主な方法:

放射線輸送と用量計算をモデル化するためにモンテカルロシミュレーションを使用した.
BETA-M RTGモデルがBlenderソフトウェアで作成され,人類型ファントムが組み込まれました.
無傷の器具と,異なる距離で暴露されたストロンチウム90源のシナリオについて,用量率を分析した.

主要な成果:

密閉されたRTGからの有効用量率は約0. 03mSv/ sでした.
胸部から30cmの距離で,投与量は7. 33mSv/sに増加した.
顔面への曝露で眼線量は85. 2mSv/ sに達し,年間限度値を急速に上回った. 放射線の流れは放射源から離れるにつれて大きく減少した.

結論:

RTGの漏れは,安全な職業上の限界を遥かに超えた,深刻で即時の放射線の危険性をもたらします.
RTG事故に伴う放射線リスクを理解するには,正確なモデリングが不可欠です.
強化された安全対策と封じ込めプロトコルは,高活性ストロンチウム-90源を使用するデバイスにとって不可欠です.

キーワード:

モンテカルロシミュレーション放射性同位体熱電発電機放射線事故放射線保護

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