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廃棄物$$gamma$$線分析システムによるウラン238定量結果の検証

Verification of uranium 238 quantity calculated using waste assay systems

横山 薫; 秦 はるひ  ; 小原 義之; 長沼 政喜; 杉杖 典岳

Yokoyama, Kaoru; Hata, Haruhi; Ohara, Yoshiyuki; Naganuma, Masaki; Sugitsue, Noritake

原子力施設の廃止措置で発生するウラン系廃棄物を収納したドラム缶中のウラン238($$^{238}$$U)量は、$$gamma$$線測定等を用いて評価される。CANBERRA製のQualitative and Quantitative (Q$$^{2}$$) Low Level Waste Assay Systemsを用い廃棄物ドラム缶を測定した。本装置はウラン線源の均一分布を仮定するが、実廃棄物ドラム缶では均一性は確認されていない。そのため、著者らが開発した線源の偏在を補正する新しい解析手法を用いて評価した結果、ドラム缶中の線源偏在が、本装置の$$^{238}$$U定量値へ与える誤差を評価できた。

The amount of $$^{238}$$U in uranium-contaminated waste drums generated in the decommissioning of nuclear facilities is evaluated using $$gamma$$ ray measurement. We used the $$gamma$$-ray measurement system made from CANBERRA: Qualitative and Quantitative (Q$$^{2}$$) Low Level Waste Assay Systems and measured the waste drum. This equipment assumes uniform distribution of the uranium radiation source. But, homogeneity is not checked with a real waste drum. Authors developed the new analysis technique which calculates the amount of uranium by correcting the influence of uneven distribution of the uranium radiation source. As a result of evaluating using the new analysis technique, the error which the radiation source uneven distribution in a drum gives to $$^{238}$$U quantitative value of this equipment has been evaluated.

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