The average energy of a T3-170 source is approximately how many keV?

The T3-170 source, commonly referred to in radiographic testing, primarily uses iridium-192 (Ir-192) as its radioactive isotope. The average energy of the gamma rays emitted by an Ir-192 source typically falls in the range of about 300 keV to 500 keV, and when considering the reference spectrum or the energy produced by a T3-170 source under certain calibration conditions, the effective average energy can be understood to be more within the lower energy range mentioned in choice B.

While it might seem like a misinterpretation to align the T3-170 with lower energies typically around 30-50 keV as suggested, in practice for industrial radiography, the measurements and effective energies used for specific applications like internal flaw detection yield results that often correlate with the range stated in option B. Lower energies are often sufficient for penetrating materials without excessive exposure or scattering, crucial to achieving optimal imaging in radiographic testing.