Radioactive materials are no longer widely used for this purpose:
here Use of Radium

"When concentrated, radium glows in the dark. Because of this property, it was once mixed with a paste of zinc sulfide to make a self-luminescent paint for watch, clock, and instrument dials. During the 1930s it was found, however, that exposure to radium posed a serious hazard to health: a number of the workers who routinely used the radium-containing luminescent paint developed anemia and, in some cases, bone cancer. The practice of employing radium in luminescent coatings was halted after the high toxicity of the material was recognized."

here EPA Guidelines
here (Iranian Journal of Chemistry and Chemical Engineering)

Transport and disposal of radioactive materials is highly regulated:
here Customs Regulations for Belarus

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: here

Steve

In Geneva I have the same problem with the "exit" sign they are to close of the screen, butfor me, safety must be the rule in every closed area.
The system that we use is a little complicated but is work: The exit sign are low-illuminated by LED's in normal mode. In case of fire Alarm, the projector is stopped, of course, the celing light are connecd to the UPS or an additional low-voltage lighting system is connected to a 24 volts battery, and the main voltage to the exit sign is switched off. BUT every "Exit " signs is fitted with a internal rechargeable battery and an voltage inverter to feed a intenal fluorescent light to bright illumine the "exit" sign. Even incase of power failure in your theater, This give a sufficien light to evacuate peoples..
I'm sorry I don't have a numeric camera to send you pictures of this equipement, but look at the folowing link: here (sorry, only in french) Is the manufacturer for Geneva of the emergency Lighting.

Bye,

Sorry for my weak English !

quote:

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...radioactive radiation, nuclear substances and materials, the movement of which across the customs border of the Republic of Belarus is restricted.

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Frank

PS -- Not to worry about your English; it was perfectly understandable -- I wish I could speak French or ANY other language as well. I particularly like the "numeric" camera -- no doubt that translats digital -- all those one's and zeros, numbers for sure.