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Approximations in PK dose calculations

Infinite slab approximation: doses at phantom boundaries

The depth (

z

) is generally

assumed to be constant within

the lateral integration plane

during calculation of the

scatter dose to a point.

Scatter underestimated

Calculation

point

0

Primary

deposition

volume

z

Errors cancel (roughly)

Calculation

point

0

Primary

deposition

volume

z

Scatter overestimated

Calculation

point

0

Primary

deposition

volume

z

Calculation

point

0

Primary

deposition

volume

z

Backscatter overestimated

Calculation

point

0

Primary

deposition

volume

z

Ideal case