In radiotherapy applications the dosemeters and electrometers are calibrated using:

• Air Kerma (K_air) for γ and Χ rays (the N_k calibration factor is provided) and
• Absorbed Dose to water (D_w) for γ rays and electrons (the N_D,w calibration factor is provided)

Dosimetric Quantities:

• Air Kerma (Gy) for γ and Χ rays.
• Air Kerma rate from ⁶⁰Co: 3,9 mGys^-1(*) at SCD=1m
• Air Kerma rate from X rays: 0,1 - 10 mGys^-1 at SCD=1m for various combinations of kV - HVL
• Expanded uncertainty (**) u = 1,2% at 95% CL (k=2)
• Absorbed dose to water (Gy) for γ rays
• Absorbed dose to water from ⁶⁰Co: 3,9 mGys^-1(*) at SCD=1m
• Range of absorbed dose in water: 2 10^-2 έως 0,5 10²(*) Gy
• Expanded uncertainty (**) u = 1,4% at 95% CL (k=2)
• Absorbed dose to water for electron beams (Gy)
• The calibrations are performed at the user’s electron beams
• Absorbed dose rate and range depends on the user’s linac
• Expanded uncertainty (**) u = 2,0% at 95% CL (k=2)

(*) July 2018
(**) Best measurement capability

 Radiation sources

• ⁶⁰Co PICKER (110 TBq - April 2012)
• X ray PANTAK (high voltage up to 225 kVp, anode W)
• User’s linear accelerators (electron beams)

 Qualities of energies used

•  ⁶⁰Co (S-Co)
• X rays: 0,1 - 2,0 mm Cu HVL (100 - 220 kV)
• X rays: 0,2 - 1,0 mm Al HVL (32 - 50 kV)
• Electron beams of user’s linear accelerators: 4 - 20 MeV

 Traceability

• BIPM, France, for S-Co and electron beams 4 - 20 MeV
• PΤΒ, Germany, for low and medium energy X rays.