The equipment determines the distribution of radioactive material in a body by measuring radiation emitted from it using a number of test probes directed simultaneously onto zones of the test field whereby the probes (2) can slide longitudinally until they come to rest against the patient's head, they are aligned by guide tracks in the mounting block (3) such that their longitudinal axes cut at a common point which lies in the measuring position on the side of the test field (22) facing the measuring head. Focussed collimators (15, 29, 30) are provided in the guide tracks of the mounting block (3). Pref. a sight vane (11) is used as marker to adjust the body (8) relative to the radiography equipment (7, 9) with means (32) to produce images on the X-ray photographs corresponding to the test zones (33-35) in the test field (22) during measurements.
