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...