Model 26-1 Frisker User’s Manual Section 2
Ludlum Measurements, Inc. Page 2-4 April 2017
Ensure that the low-battery indicator is not present. If the low-battery
indicator is present, replace the batteries as soon as possible. Should the
instrument detect a battery voltage that is high enough to power on, but too
low to safely operate, the display will blank and the low-battery icon will
flash. Normal operation will not be available until the batteries have been
replaced. Under extreme low-battery conditions, be aware that the unit may
not even turn on or may turn itself off abruptly.
A reference reading with a check source, 1 µCi (37 kBq) of
137
Cs for
example, should be obtained at the time the instrument is received in the
field. Small check sources of radiation are available from Ludlum
Measurements. While exempt from many regulations because of their small
size, these sources are large enough to produce a response on this
instrument. The detector's position is indicated by the circular screen on the
back of the Model 26-1: the seam between the enclosure halves indicates
the approximate center of the detector. If this procedure is done routinely
with the same radiation source, instrument malfunction may be detected
when anomalous readings are observed. 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.
Example log reading:
Check Source # Rate Units
Once this procedure has been completed, the instrument is ready for use.
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