Making Ion Chamber Measurements - Radcal Accu Series User Manual

MAKING ION CHAMBER MEASUREMENTS

1. Allow the system to reach equilibrium by selecting dose rate mode and waiting at least three
minutes. Do not touch digitizer. One does not need to shut the system off when replacing
chambers, however, do not disconnect the chamber when actual measurements are being made.
Each time a new chamber is used, the system must re-stabilized
.
Note: For changing environments, allow 10 minutes per 10 C for the sensor/electronics to
equilibrate.
2. Ensure that the system is set to high sensitivity on
(Setup->Mode SELECT->High sensitivity->On). This ensures that the system performs a fine
zero (as opposed to a coarse zero) prior to every measurement.
3. Do not move or touch the digitizer or the ion chamber during the zero measurement interval. If
low-level measurements are being made and there is a significant delay between measurements
(> 2-3 minutes) it is prudent to force a full re-zero by exiting the mode and re-entering.
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