ARPANSA provides calibration services for radiotherapy dosemeters. These dosemeters are used by radiotherapy providers to calibrate the output of linear accelerators and kilovoltage X-ray tubes for patient treatment.


We calibrate electrometers which are used for radiotherapy dosimetry.

Megavoltage linac photons

Radiotherapy ionisation chambers can be calibrated directly in megavoltage photon beams from a medical linear accelerator.

Megavoltage linac electrons

<p>This service is aimed at parallel plate ionisation chambers of the type used to measure electron beams.</p>

Cobalt-60 calibration

Calibrations are performed with the ionisation chamber in a water phantom using ARPANSA’s Eldorado teletherapy head.

Medium energy X-rays (MEX)

Ionisation chambers are calibrated directly against the primary standard of air kerma for medium-energy X-rays, the Medium Energy Free Air Chamber (MEFAC).

Low energy X-rays (LEX)

The low energy X-ray calibration service is intended for thin-window plane-parallel chambers required for the dosimetry of superficial X-ray beams (typically less than 70 kVp).


Information on available for clinics seeking traceable measurements for brachytherapy sources.

Recommended chamber types

The most common chamber types currently in use in Australia include the 2571 Farmer chamber, the IBA FC65‑G and the PTW 30013.

Recommended chamber voltages

Guidance on the recommended voltage for each chamber type.

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