Problem to be solved: to provide a neutron capture therapy system which enhances the reliability of the detection of the abnormality of the irradiation position to the target of the charged particle beam.Neutron capture therapy systemAccelerator for charged particle beamTarget to generate neutron beam under irradiation of charged particle beamA beam transport path 48 for transporting charged particle lines emitted from an accelerator to a targetThe interior of the beam transport path 48 is insulated from the inner wall of the beam transport path 48.A current detector 61 for detecting the current value of the charged particle beam andInside the beam transport path 48, the inner wall of the beam transport path 48 is disposed on the downstream side of the current detecting portion 61 and is insulated from the inner surface of the beam transport path 48.A current detector 62 for detecting the current value of the charged particle beam andEquipped withA current detecting portion 61, with a line of sight parallel to the extending direction of the beam transport path62.A current detector 62 is connected to the currentThe current detecting section 61 has no overlapping portion.Diagram【課題】荷電粒子線のターゲットに対する照射位置の異常検出の信頼性を高める中性子捕捉療法システムを提供する。【解決手段】中性子捕捉療法システムは、荷電粒子線を出射する加速器と、荷電粒子線の照射を受けて中性子線を発生させるターゲットと、加速器から出射された荷電粒子線をターゲットへ輸送するビーム輸送路４８と、ビーム輸送路４８の内部においてビーム輸送路４８の内壁とは絶縁された状態で配置され、荷電粒子線の電流値を検出する電流検出部６１と、ビーム輸送路４８の内部において電流検出部６１よりも下流側でビーム輸送路４８の内壁とは絶縁された状態で配置され、荷電粒子線の電流値を検出する電流検出部６２と、を備え、ビーム輸送路４８の延在方向に平行な視線で電流検出部６１，６２を見た場合に、電流検出部６２が、電流検出部６１とは重複しない非重複部位を有する。【選択図】図４
