What is the penumbra of a cobalt 60 machine with a source size of 3 cm,an SSD of 80 cm,and a source-to-diaphragm distance of 30?
A) 1 cm
B) 2 cm
C) 4 cm
D) 5 cm
Correct Answer:
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A) electrons
B) photons
C) protons
D)
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