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35040
Operators Manual
2-4
Table 2-1. Description of Quantities
Quantity Description Units Comments
ADCF
Air Density
Correction
Factor
None
Calculated by instrument and depends on front panel
Temperature and Pressure settings.
QExposure
Charge during
exposure
C
Electrical charge delivered to readout in response to
radiation incident upon detector since the last
exposure.
QAccum
Accumulated
Charge
C
The sum of all charge accumulated due to exposures
since the RESET/MEASURE button was last pressed.
QAccum_previous
Previous
Accumulated
Charge
C
The sum of all accumulated charge not including the
current exposure since the RESET/MEASURE button
was last pressed.
QElectrometer
Electrometer
Charge
C Factory calibrated electrical charge.
Q
Charge C Calibrated electrical charge.
QScaleFactor
Charge Scale
Factor
C / C
Calibrates the charge measured by the electrometer.
Viewed on a Test Function screen.
QOffset
Charge
Leakage
C
The electrical charge measured when no incident
radiation is present.
I
Current A Calibrated electrical current.
IAvg
Average
Current
A
The constant electrical current required to accumulate
charge Q over time TStart to T.
ICCF
Ion Chamber
Calibration
Factor
Ion
Chamber
Calibration
Units
/ A or C
Values are field programmable via Customization
Software.
ILeakage
Leakage
Current
A
The electrical current measured when no incident
radiation is present.
IScaleFactor
Current Scale
Factor
A / A
Calibrates the current. Viewed on a Test Function
screen.
RateMultiplier
Rate Units
Multiplier
s
Specifies the number of seconds the rate divisor is
equal to 1(s), 60(min), 3600(hr).
T
Q Sampling
Time
s The time corresponding to Q and I.
Time
Effective Time
of Exposure
s
The time required to accumulate charge QExposure
with a constant electrical current IAvg.
TOffset
QOffset
Sampling Time
s The time corresponding to QOffset and ILeakage.
QTimed
Timed Charge C
The electrical charge delivered during the timer
interval.
QTimed_Predicted
Predicted
Timed Charge
C
The total amount of timed charge that should be
accumulated at the completion of the timer interval,
based on the observed delivery rate.