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Radiotherapy services

Alanine dosimeter reference service

Achieve maximum accuracy with your dose measurements 

NPL operates a mailed alanine reference dosimetry service for 60Co γ-ray and megavoltage photon beams. A phantom set enables the small alanine dosimeters to be irradiated alongside ionisation chambers in radiotherapy photon beams. On return to NPL, the dose received by the alanine is determined by measuring the concentration of stable free radicals using electron paramagnetic resonance spectrometry.

Phantom plate showing alanine dosemeters and an ionisation chamber

Features include:

  • Convenient mailable solid-state alanine dosimeter (cylinder 11.5 mm diameter, 17 mm height)
  • Near tissue equivalence and very low energy dependence
  • Precision of single dosimeter measurement better than ±1% at 1σ for doses between 5 Gy and 10 Gy
  • Internationally recognised calibrations traceable to NPL, the UK's national standards laboratory
  • Can be used in stacks to give dose distribution information
  • Can be used in small fields, for instance as used in IMRT
  • Availability on demand throughout the year

We can provide a variety of holders and phantoms in which to place the alanine pellets. Our service is complemented by a team of experienced dosimetry specialists providing expert advice to help you achieve maximum accuracy with your dose measurements.

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Contact our Customer Services team on +44 20 8943 7070