Basic Standards and Calibrations
The 4  - coincidence/anticoincidence counting
system consisting of a high pressure 4
proportional counter with two
3 in (7.62 cm) × 3 in (7.62 cm)
NaI(Tl) detectors in opposition around the 4
counter which is typically operated at
20 (2 × 106 Pa) atmospheres.
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Inquiries or comments:
lisa.karam@nist.gov
Online: November 1997 - Last update: March 1999
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