&gt;  If cancer cells react disproportionately negatively to a substance<p>The radiation is not a &quot;substance&quot; it&#x27;s a radiation, the destructive and completely non-selective bombardment of all the molecules reached by it. It&#x27;s not a chemical effect at all, but a nuclear one.<p>I suggest that those who claim the additional low dosages are beneficial start to expose themselves to such. Somehow I doubt they&#x27;d do it. It&#x27;s always for somebody else.