Just an idea, what about an old watch/clock face with glow-in-the-dark paint on it? I have an old (ww2 german aircraft) clock that I took to work to check on a geiger counter. My boss insisted I take it straight back home after seeing if showing 100 counts-per-second. I think the radioactivity from the original paint should have been easily stopped by a piece of paper but apparently it decays into other elements that do not. A piece of paper made no difference. a 40mm thick catalogue made some difference, a sheet of aluminium made some difference. I think it must be giving off a fair cocktail of alpha, beta and gamma.
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