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Biomedical Engineering > GATE 2020 > Radiation Detection

In a nuclear imaging system, Sodium Iodide (Nal) crystals are used to detect gamma rays of 120 keV. The percentage (%) of gamma-rays that will pass through 1 cm of Nal crystal, assuming the Half-Value-Layer (HVL) of Nal as 0.2 cm, is _______ (rounded off to one decimal place).

Correct : 3.0 to 3.2

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GATE Biomedical Engineering 2020 GATE BM 2020 Q29 Half Value Layer HVL gamma ray attenuation nuclear imaging system Sodium Iodide NaI crystal radiation attenuation percentage

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