Re: “Misunderstandings lead to poor judgment and potential environmental harm: nuclear society head,” (The Hill Times, Sept. 13, p. 8). It is extremely concerning when none other than the president of the Canadian Nuclear Society, Doddy Kastanya, actually seems to believe low levels of radiation can do no harm. There is science confirming the contrary, not just common sense. There are two main sources of low-level radiation that we all should be aware of and not confuse, unwittingly or otherwise. It's bad enough that we have subatomic particles piercing our bodies and occasionally hitting our cells’ genetic material from "background" radiation: the inescapable emissions that come from the sun (thankfully heavily filtered by our atmosphere and Earth's magnetic belts), the remnants of decaying uranium in some regions, and the fallout of nuclear explosions. However, the more insidious and dangerous low-level radiation is the one from man-made radioactive particles—the kind that nuclear power plants are constantly emitting (yes, they are definitely not "zero-emission"), and which proposed projects like the nuclear dump by the Ottawa River promise to end up adding to our drinking water source. They get into our bodies and are assimilated in our intake of water, food, and air, and can remain lodged in one spot, irradiating the same cluster of surrounding cells for years. It doesn't take a rocket scientist to figure out this can be severely damaging, leading to mutations, congenital defects, and cancers. The latest scientific study to be published confirming serious low-dose radiation hazards is in the Aug. 16, 2023, issue of the British Medical Journal, but that is certainly not the first one and likely won't be the last one. The evidence is there. It's shocking that the head of our country's Nuclear Society seems unaware of that reality—or is it willful blindness? Juan Pedro (J. P.) Unger Retired federal researcher and policy analyst Ottawa, Ont.