- #1
melissaaa
- 3
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The question is: The activity of a source of Tc-99m (half-life = 6.01 hours) is counted in an ionization
chamber in a radiopharmacy.
(b) 44989345 counts are counted in 5.0 seconds. What is the activity of this
sample and what is the error on this measurement?
(c) A nearby hospital carries out a procedure which requires 6.0 MBq of Tc-99m
radiolabelled to a phosphate analogue in order to perform a bone scan. What
is the maximum amount of time that can be taken to transport the sample so
that enough activity reaches the hospital?
I did b but I'm not sure how to do this question but this is how I answered it, i got the 9 from part b:
N= No x e^(-λt)
6 = 9 x e ^ ( - 0.0013 x t)
ln (2/3) = -0.0013 x t
t = 311.9 s
chamber in a radiopharmacy.
(b) 44989345 counts are counted in 5.0 seconds. What is the activity of this
sample and what is the error on this measurement?
(c) A nearby hospital carries out a procedure which requires 6.0 MBq of Tc-99m
radiolabelled to a phosphate analogue in order to perform a bone scan. What
is the maximum amount of time that can be taken to transport the sample so
that enough activity reaches the hospital?
I did b but I'm not sure how to do this question but this is how I answered it, i got the 9 from part b:
N= No x e^(-λt)
6 = 9 x e ^ ( - 0.0013 x t)
ln (2/3) = -0.0013 x t
t = 311.9 s