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The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.
The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried.
That is, a fresh mineral grain has its K-Ar "clock" set at zero.
The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.
California and Washington states have been reassuring residents their monitoring has not detected any harmful radiation levels - and health officials do not expect to.‘Japan has an evacuation area of about 12 miles from the nuclear plants.
Washington state is 5,000 to 6,000 miles away from Japan,’ a state health spokesman said.