JP2023061450A - 廃棄物の放射性物質による汚染の検査方法 - Google Patents
廃棄物の放射性物質による汚染の検査方法 Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
2 筒
3 放射線検出器
5 開口
6 底部
7 側部(側壁)
8 同軸ケーブル
9 スペクトラムアナライザ
10 演算装置(PC)
11 通信ケーブル
12 空隙
14 検出部
16 側部遮蔽体
19 底部遮蔽体
Claims (6)
- 放射性廃棄物でない廃棄物の対象となる廃棄物の放射性物質による汚染の検査方法であって、
(a)開口部と、底部と、所定の深さの側部と、中央部に配置され前記底部から前記開口部に至る空洞を有する筒と、を備える測定容器を準備する工程と、
(b)前記測定容器の前記筒の空洞内に複数の放射線検出器を配置する工程と、
(c)40Kからの1461keVのγ線に対する、ウラン(238U)の崩壊過程で発生する234mPaが放出する766keV及び1001keVのγ線の相対効率を求める工程と、
(d)前記複数の放射線検出器によって、前記測定容器内の前記筒の回りに充填された塩化カリウム(KCl)の水溶液中の40Kからの1461keVのγ線スペクトルを測定する工程と、
(e)前記γ線スペクトルを用いて、前記複数の放射線検出器での前記1461keVのγ線の検出効率1を求める工程と、
(f)前記検出効率1と、前記相対効率と、前記塩化カリウム(KCl)の水溶液中でのエネルギー自己吸収補正値とを用いて、前記766keV及び1001keVのγ線の検出効率2を求める工程と、
(g)前記検出効率2と、密度補正係数と、234mPaの766keV及び1001keVのγ線の放出率とを用いて、前記766keV及び1001keVのγ線の測定効率を求める工程と、を含む方法。 - 前記γ線の相対効率を求める工程(c)は、
標準線源を用いて前記複数の放射線検出器の各エネルギーでの検出効率を求めることと、
当該検出効率を用いて、40Kからの1461keVのγ線の検出効率を1として、766keV及び1001keVのγ線の相対効率を求めること、を含む、請求項1に記載の検査方法。 - 前記測定効率と、前記測定容器中の廃棄物のγ線の測定計数と充填容積(重量/密度)から当該廃棄物中のウランの放射能を算出する工程をさらに含む、請求項1または2の方法。
- 前記測定容器の前記底部と前記側部の周りに放射線の遮蔽体を配置する工程をさらに含む、1~3のいずれか一項の検査方法。
- 前記複数の放射線検出器は、NaI(Tl)シンチレーション検出器を含む、請求項1~4のいずれか一項に検査記載の方法。
- 前記測定容器は、フレキシブルコンテナまたはドラム缶を含む、請求項1~5のいずれか一項の検査方法。
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