7
Parts and Accessories
REF
72722
72193
Description
A17 6 MeV Buildup Cap, 12.2 mm Delrin
In-Air Comparison Jig (REF 72722 mounts
directly to post of Jig)
General Operation Continued
MAX-4000 Electrometer, allow the user to zero the device
at any time. If desired, perform this system zeroing now.
7. Check the system leakage. Take a reading without ex-
posing the chamber to radiation. This reading should be
less than 0.1% of the nal signal expected. If it is not, the
leakage should be subtracted from the signal.
8. Measure atmospheric temperature and pressure.
9. Position the A17 chamber as desired, and take at least
3 measurements. Generally, the measurements should
not be moving in only one direction (i.e. three readings that
continue to drop and hence may not yet be stabilized). If
a current measurement is done, allow sufcient time for
value to stabilize.
10. Analyze the data taking into account the average
of the readings, system leakage, temperature/pressure
corrections, calibration factors and any other appropriate
corrections to be made. Keep in mind that the calibration
factor consists of the electrometer calibration and the ion-
ization chamber calibration factor.
11. When all measurements are completed, set bias volt-
age to 0 VDC, turn off the electrometer and disconnect the
ionization chamber.
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