How To Find a Dirty Bomb: As muons pass through the top and bottom detectors, their path builds a view of suspicious objects. Graham Murdoch From Popular Science:
Smuggling a nuclear weapon into the U.S. is distressingly simple—all someone needs is a truck full of watermelons. Regulations prohibit using high-power x-rays on perishables, and Geiger counters don’t beep alerts because the juicy fruit absorbs radiation. But a new drive-through detector takes advantage of cosmic rays to locate any nuclear material, no matter how cleverly hidden.
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My Comment: Faster please .... much faster.