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4hv.org :: Forums :: General Chatting

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Radiation hazards

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LAN_403

Conundrum

Sat Apr 19 2014, 04:20PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Seriously? I never heard of radioactive projector lamps before.

Seems like the hazards would be similar to broken tritium lamps but with the added bonus of possibly radioactive and toxic mercury (Hg).

Can someone "shed some light" on this please, and if so can a normal GM counter pick this up?

-A

Proud Mary

Sat Apr 19 2014, 10:49PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Kr-85 is used as a pre-ioniser to facilitate cold-cathode tube ignition, and as such is licence exempt in some applications like this one here:

You can read up about it here: The Glow Discharge and Cold-Cathode Tubes

Other devices using a small radiation source as pre-ioniser or to provide a 'keep alive' ion channel include some older safety spark gaps, small low-powered cold-cathode thyratrons, krytrons, and other triggered gas switches.

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