We go surfing in Ventura, usually twice a week. This summer, I have the good fortune of having an Inspector Plus with and every surf session, the CPM average of the SAND is around 72 CPM to 80 CPM. It's been constant all summer.
We wash everything afterwards: wetsuits, booties, towels, boardshorts, et al.
Then take a scrubbing shower followed by EDTA detox.
But even with those precautions, at those measurements, it's only a matter of
time. 40 miles inland, averages are above 60 CPM, on ANYTHING we test.
Assuming what we are seeing must be typical for most of the area.
And as they say, these isotopes don't dillute. Tried waking up the other
locals, but every one of them, simply doesn't want to know.