Method and device for the examination of a body by penetrating radiation

This radiological method of examination of the tomographical section of a body uses radiation between 0.2 and 2.0 MeV which is deflected in the body. The body is irradiated with a thin, parallel beam of rays emitted by a radiation source. On the side of the body opposite to the radiation source, three circular banks for detectors are arranged in a plane. The plane is crossed perpendicularly by the axis of the incident beam while the detector banks are arranged concentrically with regard to the point of intersection of the beam and the plane. The angle of deflection of a scattered ray from the axis of the incident beam can thus be registered by one of the detectors. The energy of the deflected beam can also be measured so that the distance between the centre of deflection in the body and the plane of the detector banks can be determined using the Compton scattering equation. The detectors used for the determination of the radiation energy contain Li-drifted Si or Ge, or CdTe. (HP/AK)