Radiocesium contamination of air, rain, grass, milk and humans in Belg
ium from the late 1950s to present was measured. The main sources of f
allout were atmospheric nuclear weapons tests and the Chernobyl accide
nt; in Belgium the average impact of the first on the human body burde
n was more than six times higher. The geographical distribution of rad
iocesium fallout in Belgium was surveyed by means of in-situ gamma-spe
ctrometry with HPGe detectors.