[R-390] meter luminescence

[Adam Vaughn]

 (apologies for the blank messages; it seems that the mailing list does not agree with my email system's online client, for some reason)

The meters on my '67 EAC R-390A have lighter-colored markings than the meter on my '51 Collins R-392. The R-390A meters do indeed show a small, brief amount of green glow when exposed to a bright light source, such as a camera flash; the R-392's meter shows nothing. Testing with my Cold War-era Victoreen CDV-700 geiger counter shows very little radiation from the R-390A's meters, while the R-392's meter is very 'hot'. The substance in the paint on these meter markings which actually glows is apparently zinc sulfide, which degrades much quicker than the radium which induces the glow
-Adam

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Adam Vaughn
Collector of old computers, video game systems, radios and other electronic
equipment...
Visit my page at
http://www.electronixandmore.com/adam/index.html