National Physical Laboratory

HDR and LDR brachytherapy

Calibration Service for 192Ir High Dose Rate (HDR) Brachytherapy Dosemeters

Brachytherapy - Well Chambers
Well chambers

NPL's 192Ir HDR brachytherapy calibration service is for ionisation chambers used as secondary standards or instruments required for measurement of the greatest accuracy. Calibration of either an ionisation chamber alone or of a complete system including an electrometer is available.

Service Features

  • Calibration directly against the NPL air kerma primary standard
  • Reference air kerma rate (RAKR) of the 192Ir source up to 50 mGy/h

Specification and Availability

Brachytherapy - Calibration Jig
Thimble chamber calibration jig
  • Calibration of well-type (re-entrant) chambers suitable for HDR sources
  • Calibration of thimble chambers with customer provided calibration jig
  • Electrometer calibration (charge or current calibration)
  • Calibrations are normally carried out in spring, and are undertaken using a microSelectron 192Ir HDR source
  • Calibration conforms to IPEM Code of Practice (2010)

For more information, please contact Thorsten Sander or our Radiation Dosimetry Team

Calibration Service for Low Dose Rate (LDR) Brachytherapy Sources

Fidelis secondary standard radionuclide calibrator
Fidelis secondary standard
radionuclide calibrator

NPL's LDR brachytherapy service includes the calibration of 125I seeds and 192Ir wires and pins. The sources are calibrated with the Fidelis secondary standard radionuclide calibrator.

Service Features

  • Source calibration traceable to the NPL air kerma primary standard

Specification and availability

  • Source calibrations in terms of μGy/h at 1 m or MBq
  • Calibration of 125I seeds and 192Ir wires and pins, including 125I seeds (e.g. IMC 6711 OncoSeedTM, IMC 7000 RAPIDStrandTM)and 192Ir wires and pins (e.g. Amersham ICW-series)
  • Calibrations of other source types/configurations possible
  • Calibrations are available by arrangement throughout the year


Customer Services tel: +44 20 8943 8695

Last Updated: 9 Aug 2016
Created: 17 Apr 2007


Please note that the information will not be divulged to third parties, or used without your permission