Physics Athens 2016

How to measure absorbed dose in water:

- put ionisation chamber in H 2

O in reference conditions

- irradiate with photon beam  reading M Q

(Q = quality of your beam)

calculate dose to H 2

O in absence chamber:

∙  k i

D w,Q

= M Q

∙N D,w,Co

∙k Q,Co

N

: chamber calibration factor, delivered by standards

D,w,Co laboratory (N D,w,Co

specific for each individual chamber)

k Q,Co

: correction of N D,w,Co

for use in quality Q instead of Co

(depends on chamber type and beam quality Q)

corrections for deviations from reference conditions other than Q, e.g. temperature, air pressure, recombination, etc.  k i : i