This is an updating graph of background radiation in my home town in Western Australia. It is updated 6 hourly. It runs whenever I have my Geiger counter on. Typically the background is about 60 counts per minute (CPM).
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This 1930’s watch face had radium painted numerals to permanently glow in the dark. It has long stopped being visible as the phosphor degenerated. Strong UV light can still light it up but not as much as a bag of similar phosphor (activated zinc sulphide) shown here.
“Continue reading” for radioactive counts, more details and links…
A Geiger counter measures various types of ionising radiation such as Gamma rays. Shown here with antique Uranium marbles that were bright due to some fluorescence.
“Continue reading” for a hotter Uranium sample, specifications and links…
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