Model 5 Geiger Counter
Technical Manual
Section 2
Ludlum Measurements, Inc.
Page 2-3
May 2014
The count rate scale reads 0-2.0mR/hr and has
BAT OK
on the dial.
If the needle is pointing as indicated above and the instrument range selection
switch is on the ×0.1 scale multiple, then the reading is 1.5 mR/hr (multiplied
by) ×0.1 = .00015 R/hr.
The same needle indications on successive ranges would be:
×1 = 1.5 mR/hr (or .0015 R/hr)
×10 = 15 mR/hr (or .0.15 R/hr)
×100 = 150 mR/hr (or .15 R/hr)
×1000 = 1500 mR/hr (or 1.5 R/hr)
Operational Check
To assure proper operation of the instrument and the detector(s) between
calibrations, an instrument operational check including battery test and
instrument should be performed at least daily or prior to use, whichever is less
frequent. A reference reading (or readings) with a check source should be
obtained with the detector(s) in a constant and reproducible manner at the time
of calibration or at the time the instrument is received in the field.
If at any time the instrument fails to read within 20% of the reference reading
when using the same check source, it should be sent to a calibration facility for
recalibration and/or repair. If desired, multiple readings may be taken at
different distances and/or with different sources so that other ranges or scales
are checked.
Summary of Contents for 5
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