ANORDNING FOR ATT MEDELST RADIOAKTIV STRALNING ELLER RONTGENSTRALNING FRAN EN STRALNINGSKELLA AVSOKA ETT FOR STRALNING NORMALT GENOMTRENGLIGT FOREMAL

摘要

An apparatus is arranged to be brought into a field of radio-active radiation or X-radiation immergent from the radiation source for sensing an object. A rotatable, driven body of a radiation absorbing material is used provided with portions pervious to the radiation. The body has a central chamber and open channels extend between the outer surface of the body and the chamber, through which channels the radiation passes in the form of narrow beams to a detector which detects the radiation and generates a signal corresponding to the intensity of the radiation.