Postal dose intercomparison of 60Co dosimetry using thermoluminescence dosimeters among secondary standard dosimetry laboratories

A postal dose intercomparison of 60 Co dosimetry at the radiotherapy level was carried out in the Secondary Standard Dosimetry Laboratory (SSDL) Network using LiF. The deviations between the dose quoted by the 22 Secondary Standard Dosimetry Laboratories taking part and that measured by the International Atomic Energy Agency's dosimetry laboratory were all less than 5% and in 16 cases were less than ±2%, the estimated uncertainty in the method.