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I am in the beginning stages of starting my own business
of performing radiation scanning surveys of large land areas. If I was to
perform gamma surveys for license termination in California, what would be the
"best" technology available to perform these surveys? I know sampling will
have to be done and can be counted on a HPGe, REGe or the like, but what about
land area scanning? Typically in the past 2 x 2 NaI detectors were used,
and large area plastic scintillator (LAPS) detectors are comparable, but
the "Best" is . . . .? I have thought about getting a 4 x 4 x 4 NaI but
then a 4 x 4 x 16 NaI would be better. . .then four 4x4x16 NaI detectors
would be better still. But then this large of a detector array would mean
I would be averaging a point source over the field of view of the detector
system . . . I run into the same line of thinking when I try to figure out how
fast to scan. I typically take a moving one second count with a
LAPS using a GPS, but wouldn't a one minute static count be better before
moving on? What detector and scanning method is out there that can measure
gamma emitting radioisotopes to a 1 in a 1,000,000 cancer
risk?
Carl Speer
Real-time Radiological Services, Inc
Las Vegas, NV
702-639-0066
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