Recent content by Positronix

Thanks, I learned 2 important things from your refresher and corrections. 3 things, really -- my silliest error was thinking that a periodic table that was only showing one number (atomic number as it turns out) was showing atomic weight... I hate those! I should have known 90 was too small for...

Thanks in advance for explaining this to me. I have a very small sample of thorium dioxide in a sealed ampoule (reasonably pure) as an example of thorium for a display. Every time I wonder what % of the compound is thorium people start talking moles and grams and envisioning it in a...

It's all over the internet, the epidermis-deep explanation of radioluminescent zinc sulfide, "doped" or "activated" with copper (green) and/or silver (blue), being the phosphor that people mixed with radium salts (perhaps radium-doped barium or something with a bit more bulk for managability and...

Hello, My interests pertinent to Physics Forums include acoustics (since I design traditional-style woodwind instruments but with modern theory and resources), electromagnetic vibration (as it applies to amateur radio and more), and lay nuclear physics (making spinthariscopes, making radiation...

Enjoying my Victoreen 493 and Lionel CD V-700 geiger counters with some uranium ore rocks, Americium-plated pellet, thorium dioxide samples, thorium-treated gas lantern mantle, and a couple old alarm clocks with radium paint.