RE: [fluka-discuss]: What is really happening when requesting Cf-252 decay?
Dear Joachim,
Thank you for looking into that. It helps.
This is interesting and gives an answer to my onw issue : photon
exposure from a Cf-252 source. The alpha/beta decay products are not the
main issue.
Thanks to the decay schemes you attached, we can see that the
probability of contributing to the exposure of a 2614.5 keV photon (from
Tl-208 decay) with a Cf-252 is 0.035 %.
I did an experiment of my own with a little Cf-252 source which is
almost one half life old today (~ 6 kBq).
Almost no chance to see the decay products till Tl-208, did not even
detect Ac-228.
I measured the photon spectrum with a HPGe detector.
I only measure various fission products (a lot of Eu isotopes which
might be contributing to photon exposure) and Cf-249 of course.
Of course neutron exposure is the main issue here but I wondered if I
could somehow evaluate photon exposure as well.
Best Regards.
Sebastien.
Le 2014-06-23 18:15, Joachim Vollaire a écrit :
> Dear Sebastien
>
> I was looking at pending questions in the list and here is a follow-up
> of your post from a couple of weeks ago.
>
> Emission of alphas and spontaneous fission is not treated when using
> Cf-252 as a source. Also for some reason it seems that for A > 245
> flair considers the entry as invalid in the HI-PROPE card as you are
> pointing out (even though FLUKA runs fine). I am speculating but this
> limit may rather come from ion transports for which the HI-PROPE card
> is used to specify the charge and mass of the transported ions.
>
> Otherwise I ran a case similar to the one you ran but simpler (source
> in vacuum). I score an electron and photon spectrum and besides the
> peak of Tl-208 I could see many other peaks in the PHOTON spectrum
> (239 keV Pb-212, 338 keV/463 keV/583 keV... Ac-228, 554 keV
> Np-240m....) below 1 MeV. For the electron spectrum, I have a
> continuous beta- spectrum with an endpoint around 2.250 MeV which
> seems to correspond to Bi-212. There are two discrete electron at
> ~2.520 MeV and ~2.590 MeV which I could not correlate anything looking
> quickly (but the branching ratio seems low....). Thus I would conclude
> that photon and beta emission of the decay products seems to be
> produced from the spectra I have observed.
>
> Hoping this help
> Greetings
> Joachim
>
>
> Decay modes:
> Alpha Diso: 0 BR: 96.910% Qval: 6.2168
> SpontFiss Diso: 0 BR: 3.090% Qval: 207
> === Chain with 96.91 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248
> === Chain with 88.9052 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244
> === Chain with 88.7985 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240
> === Chain with 88.7985 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212
> === Chain with 88.7009 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212
> === Chain with 56.8094 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (64.046% BetaMinus) T1/2=3630
> 84-Po-212
> === Chain with 56.8094 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (64.046% BetaMinus) T1/2=3630
> 84-Po-212 (100% Alpha) T1/2=2.99e-07
> 82-Pb-208
> === Chain with 0.0124181 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (0.014% BetaMinus+Alpha) T1/2=3630
> 82-Pb-208
> === Chain with 31.8791 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (35.94% Alpha) T1/2=3630
> 81-Tl-208
> === Chain with 31.8791 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (99.89% BetaMinus) T1/2=433
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (35.94% Alpha) T1/2=3630
> 81-Tl-208 (100% BetaMinus) T1/2=183
> 82-Pb-208
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212
> === Chain with 0.0976784 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212
> === Chain with 0.0625591 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (64.046% BetaMinus) T1/2=3630
> 84-Po-212
> === Chain with 0.0625591 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (64.046% BetaMinus) T1/2=3630
> 84-Po-212 (100% Alpha) T1/2=2.99e-07
> 82-Pb-208
>
> === Chain with 0.0351056 %
> 98-Cf-252 (96.91% Alpha) T1/2=8.34e+07
> 96-Cm-248 (91.74% Alpha) T1/2=1.07e+13
> 94-Pu-244 (99.88% Alpha) T1/2=2.55e+15
> 92-U-240 (100% BetaMinus) T1/2=50800
> 93-Np-240m (0.11% IsoTrans) T1/2=433
> 93-Np-240 (100% BetaMinus) T1/2=3710
> 94-Pu-240 (100% Alpha) T1/2=2.07e+11
> 92-U-236 (100% Alpha) T1/2=7.39e+14
> 90-Th-232 (100% Alpha) T1/2=4.43e+17
> 88-Ra-228 (100% BetaMinus) T1/2=1.81e+08
> 89-Ac-228 (100% BetaMinus) T1/2=22100
> 90-Th-228 (100% Alpha) T1/2=6.03e+07
> 88-Ra-224 (100% Alpha) T1/2=316000
> 86-Rn-220 (100% Alpha) T1/2=55.6
> 84-Po-216 (100% Alpha) T1/2=0.145
> 82-Pb-212 (100% BetaMinus) T1/2=38300
> 83-Bi-212 (35.94% Alpha) T1/2=3630
> 81-Tl-208 (100% BetaMinus) T1/2=183
> 82-Pb-208
> -----Original Message-----
> From: owner-fluka-discuss_at_mi.infn.it
> [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of wurth
> Sent: 02 June 2014 14:29
> To: fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: What is really happening when requesting
> Cf-252 decay?
>
> Dear Fluka users and developers,
>
> I’m interested in Cf-252 photon external exposure.
>
> One way I tried to: by activating fluka decay semi-analogue mode and
> defining Cf-252 as a source with BEAM card and SDUM=ISOTOPE.
>
> First, Flair does not like very much my HI-PROPE value for A (= 252.
> (invalid input value)), but FLUKA runs anyway (with Z = 98. & A = 252.
> in HI-PROPE are recognized in the echo output in *.out).
>
> Did a simple setup, cylindrical isotropic source in Teflon vessel,
> nothing complicated (files attached if needed).
>
> And I got results, some decay scheme is clearly simulated ; it seems
> to work just fine, but… I’m not sure what is really calculated here
> and I was hoping that someone could share some wisdom on that matter.
>
> I know that so far decay mode doesn’t involve alpha and fission
> products decays, only beta + and – decays with associated photon
> emissions.
> So the first non alpha emitter daughter of Cf-252 chain is U-240 (after
> 3 alpha decays) which is beta – emitter, this goes on by various
> decays till joining Th-232 decay chain.
>
> When I score photon fluence in a usrtrack card in a region containing
> my source I got a peak at ~ 2614.5 keV which is a known peak from
> Tl-208 related to Thorium.
>
>
> Thanks in advance for any hint, comment.
>
> Cheers.
> Sebastien.
Received on Wed Jun 25 2014 - 11:05:32 CEST
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