The hazards to man of nuclear fallout produced by the nuclear tests in the atmosphere were briefly discussed. Seriousness of hazards due to Sr-90 existing not only in the nuclear fallout but also in the spent nuclear fuel and nuclear waste was pointed out. The uncertainty in health hazards to Koreans coming from the relatively low fraction of Ca intake from dairy products was stressed. In order to minimize the possible additional damage due to the particular Korean meal pattern, the investigation of ways to reduce the Sr-90 intake from Korean foods was proposed.