© International Commission on Radiation Units and Measurements 2007
APPENDIX A: IMPLEMENTATION OF THE TRS 398 CODE OF PRACTICE FOR IONIZATION CHAMBER DOSIMETRY
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A.1 CALIBRATION OF IONIZATION CHAMBERS
When an ionization chamber or dosimeter is sent to a standards laboratory for calibration, stability-check measurements (using a suitable check device) should be carried out by the user before and after the calibration. This will ensure that the chamber response has not been affected by the transportation. A reference ionization chamber should be calibrated at a reference quality Q0 at intervals not exceeding 2 or 3 years, or whenever the user suspects that the chamber has been damaged. If directly measured values of kQ,Q0 (or ND,w,Q0) for the chamber have been obtained previously, a recalibration to verify the quality dependence of the chamber should be made at least every third time that the chamber is calibrated. The chamber should be recalibrated at
A.1.1 Calibration in a 60Co beam
A.2 REFERENCE DOSIMETRY IN THE USER PROTON BEAM
A.2.1 Determination of the absorbed dose to water
A.2.2 Practical considerations for measurements in the proton beam
A.2.3 Corrections for influence quantities
A.2.3.1 Temperature, pressure, and humidity
A.2.3.2 Electrometer calibration
A.2.3.3 Polarity effect
A.2.3.4 Ion recombination
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