An experiment is carried out with monoenergetic photons in the "good" geometry shown in Fig. 8.7. The relative count rate of the detector is measured with different thicknesses x of tin used as absorber. The following data are measured: NARROW BEAM x (cm) 0.50 1.0 1.5 2.0 3.0 5.0 Relative count rate 1.00 0.861 0.735 0.621 0.538 0.399 0.210 ОEТЕСТOR (a) What is the value of the linear attenuation coefficient? (b) What is the value of the mass attenuation coefficient? (c) What is the photon energy? d«R Fig. 8.7 Illustration of "good" scattering geometry for measuring linear attenuation coefficient u. Photons from a narrow beam that are absorbed or scattered by the absorber do not reach a small detector placed in beam line some distance
An experiment is carried out with monoenergetic photons in the "good" geometry shown in Fig. 8.7. The relative count rate of the detector is measured with different thicknesses x of tin used as absorber. The following data are measured: NARROW BEAM x (cm) 0.50 1.0 1.5 2.0 3.0 5.0 Relative count rate 1.00 0.861 0.735 0.621 0.538 0.399 0.210 ОEТЕСТOR (a) What is the value of the linear attenuation coefficient? (b) What is the value of the mass attenuation coefficient? (c) What is the photon energy? d«R Fig. 8.7 Illustration of "good" scattering geometry for measuring linear attenuation coefficient u. Photons from a narrow beam that are absorbed or scattered by the absorber do not reach a small detector placed in beam line some distance
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Transcribed Image Text:An experiment is carried out with monoenergetic photons in
the "good" geometry shown in Fig. 8.7. The relative count rate
of the detector is measured with different thicknesses xof tin
used as absorber. The following data are measured:
NARROW BEAM
x (cm)
0.50
1.0
1.5
2.0
3.0
5.0
Relative count rate 1.00 0.861
0.735 0.621 0.538 0.399
0.210
DETECTOR
(a) What is the value of the linear attenuation coefficient?
(b) What is the value of the mass attenuation coefficient?
(c) What is the photon energy?
d«R
Fig. 8.7 Illustration of "good" scattering geometry for
measuring linear attenuation coefficient u. Photons from a
narrow beam that are absorbed or scattered by the absorber do
not reach a small detector placed in beam line some distance
away.
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