Radium half life
By: chippyfly : June 24th, 2020-04:58
Thanks for sharing your vintage U-N’s but please be careful about regular wearing. I share my 1958 U-N here, which radiates at about 0.9 µSv/hr and mine's original dial has no “parking marks” and is safe to wear a few days at a time, which I do. I have a ...