JB>> yup, it takes a phosphor or Cherenkov radiation to glow in the
 JB>> dark, and Cherenkov radiation mainly happens underwater.
 
 CJ> Tsk.  And so recently in this echo radium watches were mentioned.

 JB> AFAIK raduim watche dials use a phosphor of some sort mixed with
 JB> radium. 

	Zinc sulfide, I see on checking with the Enc. Brit.'s
"Radium."    

 JB> most atomic radiation is invisible - either particles or invisible
 JB> wavelenghts of light (gamma rays)

	However, the same entry:  "Glass containers of considerable
quantities of radium also become coloured, and sizable preparations
can be seen to glow in the dark.  These properties are not peculiar 
to radium but are common to all strongly radioactive substances."

	I think we can agree that it's not a good idea to keep
radioactive isotopes next to computer chips.  8-)


	


--- Blue Wave/DOS v2.30 [NR]