Model 3001 Multi-Detector Survey Meter
User’s Manual
Section 2
Ludlum Measurements, Inc.
Page 2-11 April 2017
Note:
Sigma audio is disabled in Count Mode. If Sigma Audio and Count
Mode Audio are enabled, click audio will be utilized in Count
Mode. If a result in terms of activity is desired, the scaler count can
also be in units of "d" or disintegrations. But if the count units are
chosen to be cpm or cps, then the resulting answer is an averaged
count rate over the time interval. Similarly, if count units of Bq or
dpm are chosen, the resulting answer is an averaged disintegration
rate.
Note:
If the user desires the instrument to show results in terms of
disintegrations/area (eg. dpm/100cm
2
or Bq/cm
2
), then the
appropriate factor should be placed in the Efficiency parameter.
Other choices are to have count mode units of R/h or Sv/h, in which case
the COUNT mode result is an averaged exposure or dose rate. But if count
mode units of R or Sv are chosen, the result is shown in accumulated
exposure or accumulated dose over the chosen count time. The following
tables lists the possibilities:
UNITS
RESULT
c
counts per count time
d
disintegrations per count time
cpm, cps
count rate averaged over the count time
dpm, Bq
disintegration rate, averaged over the count time
R/h, Sv/h
exposure or dose rate, averaged over the count time
R, Sv
integrated exposure or dose over the count time
