870 / 1228
6.3. Ionization chambers to be used
For HDR sources, chambers volumes > 0.5 cm
3
can be used (e.g. Baldwin-
Farmer 0.6 cm
3
chamber). For LDR sources, chamber volumes up to 1,000
3
b d f
ffi i
t i
l b t h l
if
it
ti
cm may e use or su c en s gna , u ave arge non-un orm y correc on
factor uncertainties. For
192
Ir, chambers should have air-kerma calibration
factors vary less than 5% between
60
Co and 60 keV.
6.4. Air kerma calibration of ionization chambers
6.5. Correction factors for free in-air measurements
6.6. Uncertainty of free in-air calibration
etc., etc.