Not sure if this falls in this category.
I am trying to duplicate a paper simulation for Lu-177, just a surface source of 2.5mm diameter sphere.
While my simulation results the dose drop-off seems much quicker than the paper.
I run some point source and seems mean range and max penetatrion are shallower.
I attached my code and wondering did I set something wrong?
Thanks.
Lu177Surface.flair (2.2 KB)
Lu177Surface.inp (1.8 KB)
I also simulated a point source in water, the max range seems off (less than 1mm). Really confused on what the problem is.
Lu177MeanMax.flair (2.2 KB)
Lu177MeanMax.inp (1.6 KB)
I simulate a 497keV electron isotropic source, which is the mean beta energy for Lu-177 decay. The result is very similar to the publication. But the Lu-177 simulation is off. Is something wrong here?
It seems like the Fluka decay scheme for Lu-177 is not correct.
I had an earlier thread and now I sampled the beta spectrum and it seems the Fluka data is wrong.
Betas from 177Lu (6.734 d 12)
Eb endpoint (keV) Ib (%) Decay mode
176,98 12.2 7 b-
248,63 0.053 22 b-
385,35 9.1 13 b-
498,3 78.6 11 b-
Hallo,
the Lu-177 decay data in FLUKA is actually correct, as indicated by the resulting spectrum (thanks to @pschoofs)
where the peaks are photons and the background, extending towards the ~500 keV endpoint, is due to electrons. Note that the energy you took above is in fact the endpoint of the ~80% emission, which is not at all representative of the spectrum, being three times higher than the respective mean beta energy.
Thank you so much, really appreciate.
