Abstract
The majority of Canadian cancer clinics now offer brachytherapy treatments, but source calibrations currently require transfer chambers to be sent out of the country. The logistical difficulties involved in shipping delicate and crucial medical equipment internationally prompted the Canadian user committee to encourage the Ionizing Radiation Standards (IRS) group, Institute for National Measurement Standards, NRC, to develop brachytherapy standards in Canada and to provide brachytherapy calibrations to the Canadian radiation therapy community. The IRS group has undertaken the development of primary standards for brachytherapy. Using a technique similar to that employed by the French primary standards Laboratoire National Henri Becquerel (LNHB), the IRS version of the dosimetric standard realization for 192Ir will use a non-contact, indirect distance measuring method. The HDR calibration facility is under construction and should be operational in 2010. If there are no unexpected set-backs, HDR calibrations should be available in the beginning of 2011. In addition, IRS is actively searching for a Ph.D. candidate to begin development of an IRS LDR facility.
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