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Chemical standard (Fricke)
- dose determined by measuring chemical change in an
irradiated medium
- Fricke dosimetry: dosimeter consists of Fe
2+
in water
(solution highly water equivalent)
- due to ionizing radiation Fe
2+
Fe
3+
-
D =
M / (
·G(Fe
3+
))
-
M = mole Fe
3+
/liter
-
= 1.024 kg/liter for standard Fricke solution
- G(Fe
3+
) = 1.607·10
-6
mole Fe
3+
/J, for
60
Co
dosimetry: determine concentration of Fe
3+
in Mole/liter