RADIATION EVALUATION METHOD, METHOD FOR REMOVING NUCLEAR FUEL DEBRIS, AND RADIATION EVALUATION DEVICE

To provide a radiation evaluation method, a method for removing nuclear fuel debris, and a radiation evaluation device that can evaluate more easily than before intensity of a radiation source in a target area where removal work is performed.SOLUTION: A radiation evaluation method includes the steps of: installing radiation detectors 120, 130 having directivity at two or more different positions to measure a radiation counting rate c in two or more places in an area 101 where removal work is performed; estimating detection efficiency ε of the radiation detectors 120, 130 for the target area 101; and from results of measurement at the different positions, comparing values obtained by dividing the radiation counting rate c by the detection efficiency ε to evaluate intensity of a radiation source present in the area 101.SELECTED DRAWING: Figure 1 【課題】 撤去作業を行う対象領域の放射線源強度を従来に比べて容易に評価することができる放射線評価方法、核燃料デブリの撤去方法、および放射線評価装置を提供する。【解決手段】 指向性を有する放射線検出器１２０，１３０を２以上の異なる位置に設置し、撤去作業の対象となる領域１０１の放射線計数率ｃを２箇所以上で計測する工程と、対象とする領域１０１に対する放射線検出器１２０，１３０の検出効率εを推定する工程と、異なる位置での計測結果から、放射線計数率ｃを検出効率εで割った値を比較することで領域１０１に存在する放射線源強度を評価する工程と、を有する。【選択図】 図１