(a) What is the absorbed dose in the cavity air, known to have a mass of 4.31 x 10-¹g? (b) What is the absorbed dose in the polystyrene at 2-g/cm² depth?
(a) What is the absorbed dose in the cavity air, known to have a mass of 4.31 x 10-¹g? (b) What is the absorbed dose in the polystyrene at 2-g/cm² depth?
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Transcribed Image Text:A flat polystyrene-air ion chamber with 1-mm plate separation is positioned
with the inner surface of its front wall at a depth of 2.0 g/cm2 in a polystyrene
phantom. A beam of 15-MeV electrons incident on the phantom makes a charge
reading of 6.42 x 10-8 C, where p = 765 torr, T = 25.2°C, and the ion col-
lection efficiency is 0.973.
(a) What is the absorbed dose in the cavity air, known to have a mass of 4.31
10.
x 10-* g?
(b) What is the absorbed dose in the polystyrene at 2-g/cm² depth?
Ans: (a) 5.20 Gy (b) 5.04 Gy
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