- #1
Egomeh
- 5
- 0
Hi
I'm wondering if someone could help me out finding the Q-value fom a beta minus decay.
It's a
90Y → 90Zr + e
All sources I have says that the energy released is 2,28 MeV, but when i calculate i get 1,78 MeV
So far, I've looked up the mass of the 90Y and the Zr90 and the electron and done following:
Q=(m(90Y)-m(90Zr)-m(e))*c^2
According to my databook
m(90y) = 89,9071519u = 1,49294*10^-25 kg
m(90Zr) = 89,9047044u = 1,4929*10^-25 kg
m(e) = 9,10938*10^-31 kg
Giving a mass difference at 3,15323*10^-30 kg
resulting in a Q value of Q=2,83399*10^-13 J = 1,76883 MeV
If you can tell me what I am doing wrong, I would appreciate if you would let me know.
Thanks in advance.
I'm wondering if someone could help me out finding the Q-value fom a beta minus decay.
It's a
90Y → 90Zr + e
All sources I have says that the energy released is 2,28 MeV, but when i calculate i get 1,78 MeV
So far, I've looked up the mass of the 90Y and the Zr90 and the electron and done following:
Q=(m(90Y)-m(90Zr)-m(e))*c^2
According to my databook
m(90y) = 89,9071519u = 1,49294*10^-25 kg
m(90Zr) = 89,9047044u = 1,4929*10^-25 kg
m(e) = 9,10938*10^-31 kg
Giving a mass difference at 3,15323*10^-30 kg
resulting in a Q value of Q=2,83399*10^-13 J = 1,76883 MeV
If you can tell me what I am doing wrong, I would appreciate if you would let me know.
Thanks in advance.