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Material properties evaluation on radiation shielding lead glasses irradiated by pulsed laser

パルスレーザーが照射された放射線遮へい鉛ガラスの機械的特性評価

涌井 隆  ; 山崎 和彦*; 二川 正敏  

Wakui, Takashi; Yamasaki, Kazuhiko*; Futakawa, Masatoshi

高放射化物を閉空間に閉じ込めた状態で切断・減容化する技術開発の一環として、鉛含有量が異なる放射線遮へいガラスに対して、Nd-YAGレーザーの照射条件(パワー及び照射回数)を変えた照射試験を実施した。鉛含有量、照射パワー及び照射回数の増加とともに、大きな黒色で凹形状の照射損傷とその周りにき裂が生じた。損傷に及ぼす機械的特性の影響を調べるために、非照射部及び照射部の一般的な機械特性を調べた。評価された機械的特性を基に算出された熱衝撃破壊靭性値は、鉛含有量の増加ともに減少する。黒色の照射領域の微小硬さは、非照射より10%小さくなり、レーザー照射による機械的特性の変化が確認された。

As part of the development of technique to cut and reduce the volume of highly radioactive components in the closed space, pulsed Nd:YAG laser was irradiated to radiation shielding glasses with the different lead content in the different irradiation condition; power and number of irradiation. The large black irradiated area with concave shape and cracks around it occurred with an increase of the lead content, power and number of irradiation. General mechanical properties in unirradiated and irradiated area were investigated to investigate the influence of mechanical properties on the irradiation damage. The thermal impact fracture toughness calculated based on the estimated mechanical properties decreased with increasing the lead content. The micro hardness in black irradiated area was 10% smaller than that in the unirradiated area. The change of the mechanical property due to the laser irradiation was confirmed.

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