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$$beta$$線誘起制動X線計測型トリチウムモニタの高温環境対応

Application of tritium monitor using BIXS to high temperature atmosphere

河村 繕範; 洲 亘*; 松山 政夫*; 山西 敏彦

Kawamura, Yoshinori; Shu, Wataru*; Matsuyama, Masao*; Yamanishi, Toshihiko

ブランケットのスイープガス出口近傍等、比較的温度の高いガス中のトリチウムの測定を想定し、120$$^{circ}$$Cの雰囲気で動作する$$beta$$線誘起制動X線計測型トリチウムモニタを作成し、トリチウム測定を実施した。120$$^{circ}$$Cでは加熱しない状態の1/2程度の計数率となった。本実験系は密閉系であるため、同一圧力では温度が高い方がトリチウム分子数が少なくなることも一因であろう。加熱前後の計数率に変化はなく、加熱によるシンチレータの劣化は見られなかった。

Assuming the blanket sweep gas at the outlet of the blanket, tritium gas monitor by $$beta$$-ray induced X-ray spectroscopy has been modified, and has measured tritium at 120$$^{circ}$$C. The counting rate at 120$$^{circ}$$C was about 1/2 of that at the room temperature. In this work, the measurement system was a closed system. When two systems have same volume and same pressure, the number of molecules in higher temperature system is smaller. This is one of the causes of small counting rate. The deterioration of the scintillator after heating was not observed.

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