PROBLEM TO BE SOLVED: To detect whether or not an irradiation position on a target with a charged particle beam is normal and perform restoration in the case of detecting abnormality.SOLUTION: A neutron capture therapy apparatus 1A includes: an accelerator 10 for emitting a charged particle beam P； a target X for generating a neutron beam N using the charged particle beam P； a charged particle beam scan unit 34 for performing a scan with the charged particle beam P at a predetermined cycle along a predetermined orbit to change an irradiation position with the charged particle beam P； an annular current detection unit for detecting a current value of the charged particle beam P； an abnormality detection unit for detecting abnormality with respect to the irradiation position on the basis of a detection result of the current detection unit； and a beam adjustment unit 106 that on the basis of the detection result, performs adjustment of the charged particle beam P at a position closer to the accelerator 10 than the charged particle beam scan unit 34. The abnormality detection unit detects the abnormality with respect to the irradiation position for the target X with the charged particle beam P on the basis of a variation in the current value. The beam adjustment unit 106 adjusts a position or shape of the charged particle beam P on the basis of a result detected by the abnormality detection unit.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】荷電粒子線のターゲットに対する照射位置が正常かどうかを検出し、異常であることを検出した場合に復帰させる。【解決手段】中性子捕捉療法装置１Ａは、荷電粒子線Ｐを出射する加速器１０と、荷電粒子線Ｐにより中性子線Ｎを発生させるターゲットＸと、荷電粒子線Ｐを所定の周期で所定の周回軌道で走査して荷電粒子線Ｐの照射位置を変化させる荷電粒子線走査部３４と、荷電粒子線Ｐの電流値を検出する環状の電流検出部と、電流検出部での検出結果に基づいて照射位置に係る異常を検出する異常検出部と、検出結果に基づいて、荷電粒子線走査部３４よりも加速器１０側での荷電粒子線Ｐの調整を行うビーム調整部１０６と、を有し、異常検出部は、電流値の変化に基づいて荷電粒子線ＰのターゲットＸへの照射位置に係る異常を検出し、ビーム調整部１０６は、異常検出部で検出した結果に基づき、荷電粒子線Ｐの位置又は形状を調整する。【選択図】図１
