LUDLUM 12-4 - Page 2

LUDLUM MODEL 12-4
SURVEY METER WITH
HE-3 NEUTRON DETECTOR
May 2016
Serial Number 227878 and Succeeding
Serial Numbers
This Manual also applies to Serial Numbers of Model 12-4 Instruments where the BF-3 detector has been modified to He-3.
He-3 detectors, and those modified to be, are labeled with an “H.”