Radiation flux reduction device, particularly gamma rays, and radiation detection set using this device

This device is made up of a par reducing radiation and equipped with an opening spreading from the part edge to its centre, and part rotation means around an axis going through its centre. Making this axis meet exactly with the detection solid angle axis (X), putting the part in the way that the whole radiation contained in this solid angle goes through the part and the opening of this one and making rotate the part, the detection solid angle is totally swept at the end of one turn of the part. The whole detection device is made up of this device, a radiation detector and a radiation collimator. (Author). 2 figs., 2 refs