Oral Exam Prompt: Dosimetry 5
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TG-51 requires lead for beams of 10 MV and above, not only above 10MV as mentioned above. from the document:
“Thus the first step in specifying the photon beam quality for beams with energies of 10 MV or above is to measure the value of %dd(10)Pb with a 1 mm lead foil positioned to intercept the beam completely ~but remove it for the measurement of absorbed dose at the reference position!. For beam energies below 10 MV the lead foil is not needed and one measures %dd(10) in the open beam”