In the framework of the STRAVE project (radiation levels and exposure in The Netherlands) the dose contributions of all sources of ionising radiation in The Netherlands were evaluated. For each source the average dose and the range of doses over the exposed individuals were assessed. If possible the type of dose distribution was also assessed. Doses from some sources, such as radon, are log-normally distributed. Doses from other sources, for instance X-ray diagnostics and nuclear medicine, are irregularly distributed over the population. Apart from the influence of the distribution of indoor and outdoor residence times, which was neglected, correlations between the major sources of radiation were found to be improbable. Therefore, the distribution of the exposure of the population due to all sources could be assessed with Monte Carlo techniques, assuming no correlations. The calculations showed that about 93% of the population receive a dose between 1.5 mSv.a-1 and 5.0 mSv.a-1, while about 4% receive a dose exceeding 5.0 mSv.a-1. For the population as a whole the variability in the dose due to all sources is mainly caused by radon and X-ray diagnostics. At doses exceeding 5.0 mSv.a-1 nuclear medicine is an additional contributor.