The invention relates to a decontamination device that comprises a light source (SL), an exposure substrate (SP), and a positioning member (OP), the light source (SL) including an oblong lamp (RX, CL) and the exposure substrate (SP) being adapted for positioning and holding a hollow object (OB) having a cavity, the positioning member (OP) including an axial positioning means for generating a relative movement of the light source (SL) relative to the exposure substrate (SP) along the common axis thereof between a rest position and a working position so that the lamp enters the cavity in the working position. The lamp is further arranged in a reflector (RF).
