 During the 1980s, there were re-evaluations of the survivors of the atomic bombings of Hiroshima and Nagasaki, partly due to revisions in the dosimetry.The risks of exposure were claimed to be higher than those used by ICRP, and pressures began to appear for a reduction in dose limits.By 1989, the commission had itself revised upwards its estimates of the risks of carcinogenesis from exposure to ionising radiation.