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It is known that a collimator on
a gamma camera for low
energy 150 kev has a length of
2.5 cm, a hole diameter of
0.25 cm and an attenuation
coefficient of 1.91 cm^2 /g.
Calculate the percentage (%)
change in the minimum
thickness of the septal if the
collimator length is changed
to 3 cm!

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