+1 862 207 3288 1. What is the percent depth dose (also sometimes called DDR or depth dose ratio) for each of the following situations. Assume 100 cm SSD. See appendices in Kahn.
a. 4 MV photons, 10×10 cm field, d = 2 cm
b. 10 MV photons, 12×12 field, d = 3.5 cm
c. 10 MV photons, 8×8 field, d = 7.3 cm
d. 4 MV photons, 13×13 field, d = 5 cm
2. Recalculate the value in problem 1b for SSDs of 110 cm and 80 cm.
3. A dose of 200 cGy is prescribed at dmax for a 10×10 field, 100 cm SSD, and 4 MV photons. What is the dose 5 cm beyond dmax?
4. A dose of 150 cGy is prescribed at a depth of 7 cm for a 6×6 field, 100 cm SSD, and 10 MV photons. What is the dose at dmax?
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