Milk, rye, barley, wheat, oats, potatoes, cabbage, carrots, beef, pork and total diet have been collected all over Denmark since the 1961–62 test series and analysed for 90Sr and 137Cs. Along with the performance of diet measurements, precipitation, soil and air samples were collected and analysed for 90Sr. The diet levels were related to the fall-out data by a least squares analysis. It was not essential whether concentrations in air (or precipitation) or deposited activity were used in the “rate” and “lag” terms, although the deposition data tended to give the best models. Strontium-90 determinations in human bone and whole-body 137Cs measurements were performed for the same period as the diet measurements. Quantitative models of the transfer of 90Sr and 137Cs to man were calculated in analogy with the equations used for diet ORbone/diet was calculated from the soil factors in the equations. The prediction models were transformed to exponential equations, which served for the calculation of the dose commitments to the Danish population.