The 20 years that expired since the interviews have not changed the fact that radiation damages cellular genetic material and can lead to cancer and other health problems. This is why, since x-rays were introduced into medicine, that the ‘safe’ dosage, which assumes an increase in cancer risk, is lowered over the years, why the technician gets behind shielding for x-rays, mammograms etc. This is why there is controversy over the use of mammography because the screening technique uses radiation which introduces a cancer risk but not screening may allow a tumor to grow undetected. The known properties of radiation have not changed - the way it’s used has changed. Medicine is currently using targeted doses to turn the cellular destructive force of radiation on tumor cells. But there is an acknowledged risk - it’s an attempt at balancing the risks.