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23

energy

E

Bremstrahlung production cross

section, Z=74, 10 MeV

0

2

4

6

8

MeV

1

10

100

1000

barn

/

Sr

0

10

20

30

40

50

0.05

0.1

0.5

1

5

10

attenuation coefficient, Z=74

cm

2

/g

MeV

Beam energy spectra

- spectral filtering by the flattening filter

Direct beam spectrum, principal shape.

Spectrum distorted offaxis

towards lower

energies due to less filtration & decreasing

energy with increasing brem angle