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Theory of Operation
Basic Operating Quantities
3
3-7
3.6 Basic Operating Quantities
Table 3-3. Basic Operation Quantities
Quantity Description Units Comments
I
Current nC/Min
Electrical current delivered to readout in
response to radiation incident upon
detector.
Q
Charge nC
Electrical charge delivered to readout in
response to radiation incident upon
detector.
ADC
A-D Counts
Counts
Electrometer output level returned by
A-D Converter during dose or dose rate
measurement.
ADZ
A-D Zero
Counts
Electrometer output level returned by
A-D Converter while operating in the
dose rate measurement mode and in
the absence of radiation. A-D Zero
levels are field programmable via
Customization Software.
QG
Charge Gain
nC / Count
Overall electrical charge gain of the
electrometer / A-D combination when
measuring in the dose mode. Charge
gain values are field programmable via
Customization Software.
IG
Current Gain
(nC/Min) / Count
Overall electrical current gain of the
electrometer and A-D combination
when measuring in the dose rate mode.
Current gain values are field
programmable via Customization
Software.
ICCF
Ion Chamber
Calibration
Factor
Ion Chamber
Calibration Units
/ nC
Specific R/nC values are supplied by
factory for each of the five ion chamber
channels. Values are field
programmable via Customization
Software.
DUCF
Display Units
Conversion
Factor
Display Units
/ Radiation Calibration
Units
Factory default of 0.879 rad/R is
supplied. Value is field programmable
via Customization Software.
ADCF
Air Density
Correction
Factor
None
Calculated by instrument and depends
on front panel Temperature and
Pressure settings.
FPGF
Front Panel
Gain Factor
None
User specified via front panel gain
setting.