9. a) kev) absorbed in a Nal(TI) crystal. Compute the A Tc-99m (140 photon is b
ID: 1998774 • Letter: 9
Question
9. a) kev) absorbed in a Nal(TI) crystal. Compute the A Tc-99m (140 photon is b number of light photons at the photocathode and 30% coversion Assuming 100% light collection efficiency to electrons, compute the number of electrons released at the photocathode. an average dynode c) Consider a fourteen stage photomultiplier tube with multiplication factor of three, compute the number of electrons and the charge collected at the anode. d) Assuming the main amplifier gain is adjusted to output a one volt pulse for 100 kev deposited in the crystal, compute the voltage for Tc-99m and I-131 photons deposited in the crystal.Explanation / Answer
Solution 9(a):
Fact: We know that to produce one light photon, NaI(Tl) crystal absorb about 30 eV of incoming energy.
Given: Energy absorbed by NaI(Tl) , E = 140 keV = 140 X 103 eV
using above fact and given data, number (N) of light photons produced will be:
N = (140 X 103 ) / 30 = 466.67 =466 photons
Answer: 466 light photons
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