26
CHAPTER 2. GETTING STARTED
J
If the user desires the instrument to show results in terms of disintegra-
tions/area (eg. dpm/100 cm
2
), then the instrument should be configured for
dpm and the appropriate factor should be placed in the Efficiency parameter.
Bq/cm
2
will use the stored detector active area and perform the calculations
internally so no manipulation of the efficiency is needed.
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:
Table 2.1: COUNT Mode Units and Result
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, Rem/h, Sv/h
exposure or dose rate, averaged over the count time
R, Rem, Sv
integrated exposure or dose over the count time
In COUNT mode, operation depends on the current state of the Count Timer.
When the Count Timer is Ready:
• The display will show the Count Time.
• A short press of the UNITS button will switch between the Primary and Secondary
Count Units (and Tertiary if alpha/beta is enabled). The newly selected Count Units
will be displayed for approximately one second, and the display will then return to the
Count Timer.
• A short press of the LOG button will initiate a count (logs the displayed result upon
completion if datalogging is enabled) or a long press of the ON/AUD button (will not
log results) initiates the Count Timer.
• If other operational modes are available, a short press of the MODE button will move
to the next available operational mode.
• An extra-long press of the LOG button will change the count time to the next available
time.
When the Count Timer is Active:
• The display will show either Count Time (default), both Count Time and Counts, or
just counts, depending on Device Count Display Mode.
Ludlum Measurements, Inc.
