<div dir="ltr"><div dir="ltr">On Sat, Oct 8, 2022 at 11:15 PM Andrew Kohlsmith (mailing lists account) via kwlug-disc <<a href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Most will not detect alpha particles because they’re so weak that the plastic enclosure of the dosimeter will block them. </blockquote><div><br></div><div>Good point ... </div><div><br></div><div>Alpha particles are stopped by a single sheet of paper, so not hard at all. <br></div><div>Radon emits alpha particles, so why is it problematic? <br></div><div>Because it is a gas, and constantly seeps from sump wells and drains, it is inhaled in the lungs, where it decays, and causes ~ 16% of lung cancer cases (2nd cause after tobacco smoking). <br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
The inexpensive semiconductor based ones are IMO more susceptible to false detection since the threshold for an event on a tiny MOSFET SiO2 junction is so much smaller than that of a breakdown event in a GM tube. Still, I took my unit (<a href="https://www.aliexpress.com/item/1005003721636457.html" rel="noreferrer" target="_blank">https://www.aliexpress.com/item/1005003721636457.html</a>) and performed your experiment; I see between 0.13 and 0.15uSv/hr with no change relating to the amount of wifi or cell traffic I generated. Even when sitting on top of my fairly powerful AP, I saw nothing above 0.16uSv/hr.<br></blockquote><div><br></div><div>Thanks for repeating the experiment. That is the scientific method in action: repeating experiments to confirm or refute previous experiments and their conclusions. <br></div><div><br></div><div>So even dosimeters that report in uSv may not be good enough because of EMF and such. Good to know. <br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Where I do see some noticeable change is if I bring it near my gas stove or fireplace, or when I am near a larger diesel engine exhaust. These all make sense though; combustion does generate ionizing radiation. The most I could get out of the fireplace was 0.20uSv/hr, for example.<br></blockquote><div><br></div><div>Interesting ... <br></div><div><br></div><div>One other source that was in wide use is coal ash from power stations. <br></div><div>It had lots of radioactivity in it. <br></div><div>Good thing we no longer burn coal in Ontario. <br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I was thoroughly disappointed when I learned that neither my marble countertops nor the bananas I buy emit any noticeable ionizing radiation. I completely forgot to take it with me on my last flight; I would have expected to see an increase in that due to the window seat and significantly reduced atmosphere between me and outer space.</blockquote><div><br></div><div>There are Youtube videos of passengers doing just that, and showing an increase in radiation as the airplane goes up. <br></div></div></div>