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Magnitude of the unit of Gray / ICRU report No. 90
Съгласно ICRU report 90 : Референтните стойности за Air Kerma по Cobalt-60 са намалени с 0.7 %.
Calibrations at PTW-Freiburg are being done with reference to this new standard from Friday, September 20, 2018. This results in the calibration factor differing from earlier calibrations by about this amount. Further information please find in the ICRU abstract.
For questions regarding this calibration at PTW please contact Dr Holger Georg under email@example.com.