TG39 Flashcards
1
Q
what is TG39 on?
A
The Calibration and Use of Plane-Parallel Ionization Chambers for Dosimetry of Electron Beams
2
Q
3 ways of calibrating plane parrallel chambers
A
-high energy electrons
-60Co with chambers in air
-60Co with chambers at depth in phantom
first one is done locally. Last 2 can be done at NIST/NRC
3
Q
formula for Npp,gas for cross calibration with cylindrical chamber
A
Npp,gas = (MNgasPionPrepl)cyl/(MPion)pp
4
Q
relating dose to medium to dose to water
A
-multiply by ratio of stopping power ratios
-account for fact that depth in water will be different than depth in the material (ie multiply depth med by R50,water/R50,med to get depth in water)
