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Radiotherapy and diagnostic services

Therapy level electron absorbed dose to water calibration

Accurate and traceable calibration

Calibration of an ionisation chamber in terms of absorbed dose to water, based on primary standard electron-beam graphite calorimeter is available in Spring and Autumn each year.

This service is designed to be used with the current IPEM Code of Practice (2003), which is based on this service. The IAEA Technical Report No.398 can also be used, but this report is not recommended by the IPEM.

Calibration of NACP-02, Roos, Roos type chambers (PTW, IBA and Sun Nuclear) and graphite-walled Farmer type chambers (NE2571, PTW30004). This uses R50 alone as beam quality specifier to define reference depth. Beam qualities presently covered in the range R50=1.6 cm to 8 cm (nominal incident electron energies 4 MeV to 20 MeV). Uncertainties for direct calibration ±2 % at the 95 % confidence level. Characterisation of recombination behaviour of each chamber in terms of dose per pulse.

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