Model 26-1 Frisker User’s Manual Section 2
Ludlum Measurements, Inc. Page 2-9 April 2017
COUNT Mode Operation
When entering COUNT Mode from another operational mode, the
currently selected COUNT Units will be displayed for approximately one
second. The purpose of COUNT mode is to count for a predetermined
amount of time, and to display the results on the display. Note that the
predetermined count time can be from 1 second to 20 minutes, or can be set
to zero to enable continuous counting until stopped by the user.
Count mode operation is very flexible, depending on the units chosen. A
common choice is for the count mode to just perform a scaler count for a
specified time, with a resulting answer in counts (equaling detected radiation
events). 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 mR/h or µSv/h, in which
case the COUNT mode result is an averaged exposure or dose rate. But if
count mode units of mR or µSv 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
mR/h, µSv/h exposure or dose rate, averaged over the count time
mR, µSv integrated exposure or dose over the count time
Audio ‘clicks’ are disabled in COUNT mode.
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