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Radiotherapy and diagnostic services

Diagnostic and mammographic X-ray dosemeters

Calibration to national standards

NPL's diagnostic and mammographic calibration service is for ionisation chambers, to be used intentionally as secondary standards, or for instruments required for measurement of the greatest accuracy. Calibration of either an ionisation chamber alone or of a complete instrument is also available.

Service features

  • Calibrated directly against the NPL air kerma primary standards.
  • X-ray qualities in accordance with BS IEC 61267:2006 Medical Diagnostic X-ray Equipment - radiation conditions for use in the determination of characteristics.
  • Air kerma rates in the range 5 mGy/hr to 50 mGy/hr.

Calibration service specification and availability

Calibrations are normally carried out between October and December each year, and are undertaken with X-ray qualities in accordance with BS IEC 61267:2006 as follows:

Table of x-ray qualities for the service

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