To provide a technique capable of enhancing safety and convenience of an ultraviolet radiation device.SOLUTION: An ultraviolet radiation device 10 comprises: an ultraviolet light source 30 for outputting an ultraviolet； an integral type sensor 36 for measuring an integral dose of an ultraviolet based on electric characteristic which is varied according to a cumulative absorption amount of the ultraviolet from the ultraviolet light source 30； and a control unit 50 for controlling an operation of the ultraviolet light source 30 based on a measured value of the integral type sensor 36. The integral type sensor 36 may comprise a photochromic material whose state is changed from a first state to a second state in which electric characteristic is different from that in the first state, by absorbing the ultraviolet, and whose state is changed from the second state to the first state by absorbing a visible light.SELECTED DRAWING: Figure 1【課題】紫外線照射装置の安全性および利便性を高める技術を提供する。【解決手段】紫外線照射装置１０は、紫外線を出力する紫外光源３０と、紫外光源３０からの紫外線の累積的な吸収量に応じて変化する電気的特性に基づいて紫外線の積算線量を計測する積算型センサ３６と、積算型センサ３６の計測値に基づいて紫外光源３０の動作を制御する制御部５０と、を備える。積算型センサ３６は、紫外線を吸収することで第１状態から第１状態とは電気的特性の異なる第２状態に変化し、可視光を吸収することで第２状態から第１状態に変化するフォトクロミック材料を含んでもよい。【選択図】図１
