RADIOACTIVITY CONCENTRATION EVALUATION SYSTEM, AND RADIOACTIVITY CONCENTRATION EVALUATION SYSTEM

• Main Authors: NAGASE HIROSHI, UENO KATSUNOBU, OKADA KOICHI, NAGUMO YASUSHI, HATAKEYAMA SHUICHI, TADOKORO TAKAHIRO, UENO YUICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 09.01.2020
• Subjects: MEASUREMENT OF NUCLEAR OR X-RADIATION; MEASURING; PHYSICS; TESTING

To make it possible to evaluate radioactivity concentration in a short calculation time and with high accuracy in a radioactivity concentration system.SOLUTION: A radioactivity concentration evaluation system 1 comprises: an analysis unit 101 that calculates a first gamma ray spectrum 65 on the basis of a three-dimensional model 18 of a measurement object 24 stored in a container 41; a screening measurement unit 201 that acquires radiation actual measurement data 70 serving actual measurement data on a radiation distribution in the measurement object 24 before storing the measurement object 24 in the container 41; and an inner-container concentration distribution evaluation unit 501 that evaluates a radioactivity concentration distribution in the container 41 on the basis of an actual gamma ray spectrum 72 to be actually measured using a plurality of gamma ray detectors 47 arranged around the container 41 after storing the measurement object 24 in the container 41 and corresponding to the first gamma ray spectrum 65, and the radiation actual measurement data 70.SELECTED DRAWING: Figure 4 【課題】放射能濃度評価システムにおいて、短い計算時間で高精度に放射能濃度分布を評価できるようにする。【解決手段】容器４１に収納された計測対象物２４の３次元モデル１８に基づいて第１のガンマ線スペクトル６５を計算する解析部１０１と、容器４１に計測対象物２４を収納する前に、計測対象物２４における放射線分布の実測データである放射線実測データ７０を取得するスクリーニング計測部２０１と、容器４１に計測対象物２４を収納した後に容器４１の周囲に配置された複数のガンマ線検出器４７を用いて実測されるとともに第１のガンマ線スペクトル６５に対応する実測ガンマ線スペクトル７２と、放射線実測データ７０と、に基づいて、容器４１内の放射能濃度分布を評価する容器内濃度分布評価部５０１と、を放射能濃度評価システム１に備えた。【選択図】図４