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[Shongololo]

My 9 year old son bought this home today.

def decay(what, halflife, *modes):
    what.decays = apply(ratedDecay, (what, halflife) +
                        tuple(map(lambda m: (m[0], m[1] * eV) + tuple(m[2:]), modes)))

def photon(erg):
    return Photon(energy= erg * eV)

positron = electron.anti

# NAS table NUC, pp 37--41 lists conflicting data; not sure whence these come !
# In places I've adjusted data to match what NAS said
decay(Isotope(1, 2).atom.nucleus, 12.35 * year,
      (1, 18.62e3, electron, Isotope(2, 1).atom.nucleus))

decay(Isotope(2, 4).atom.nucleus, .81 * second,
      # NAS gave energy as 5e6
      (1, 3.51e6, electron, Isotope(3, 3).atom.nucleus))
decay(Isotope(2, 6).atom.nucleus, .122 * second,
      # 88% beta- 9.7; 12% n; 88% gamma .981
      (.98, 9.7e6 -.981e6, electron, photon(.981e6), neutron, Isotope(3, 4).atom.nucleus),
      (.02, 9.7e6, electron, neutron, Isotope(3, 4).atom.nucleus))

decay(Isotope(3, 5).atom.nucleus, .844 * second,
      (1, 13.1e6, electron, Isotope(4, 4).atom.nucleus))
decay(Isotope(3, 6).atom.nucleus, .178 * second,
      # NAS gives 13.6 MeV beta-, followed 75% of the time by a .76 MeV neutron
      # 65% beta- 13.6; 35% n, 2 alpha ?? [the 2 alpha shall be (3,5)'s decay via (4,4)]
      (.65, 13.6e4, electron, Isotope(4, 5).atom.nucleus),
      (.35, 0, neutron, Isotope(3, 5).atom.nucleus))
decay(Isotope(3, .atom.nucleus, 8.5e-3 * second,
      # 39% beta- 20.4; 61% n
      (.39, 20.4e6, electron, Isotope(4, 7).atom.nucleus),
      (.61, 0, neutron, Isotope(3, 7).atom.nucleus)) #

Isotope(4, 2).atom.nucleus.halflife = .4 * second # unspecified decay
decay(Isotope(4, 3).atom.nucleus, 53.3 * day,
      # 100% K; 10% gamma .477
      (1, 47.7e3, positron, Isotope(3, 4).atom.nucleus))
decay(Isotope(4, 4).atom.nucleus, 7e-17 * second, (1, 0, alpha, alpha))
decay(Isotope(4, 6).atom.nucleus, 1.6e6 * year, # NAS gives 2.5e6 * year
      (1, 556e3, electron, Isotope(5, 5).atom.nucleus))
decay(Isotope(4, 7).atom.nucleus, 13.6 * second,
      # NAS gives 11.5 MeV beta-, followed 32% of the time by a 2.14 MeV gamma
      # 57% beta- 11.5; 33% gamma 2.12; 5% gamma 6.79; 2% gamma 5.85
      (.57, 11.5e6, electron, Isotope(5, 6).atom.nucleus),
      (.33, 2.12e6, Isotope(4, 7).atom.nucleus),
      (.05, 6.79e6, Isotope(4, 7).atom.nucleus),
      (.02, 5.85e6, Isotope(4, 7).atom.nucleus))
decay(Isotope(4, .atom.nucleus, .0114 * second,
      # NAS gives 12 Mev beta- plus a photon
      (1, 0, electron, neutron, Isotope(5, 6).atom.nucleus))

decay(Isotope(5, 3).atom.nucleus, .77 * second,
      # 93% beta+ 13.7; 100% 2 alpha
      (.93, 13.7e6, positron, Isotope(4, 4).atom.nucleus),
      (.07, 1.6e6, alpha, Isotope(3, 1))) #
decay(Isotope(5, 7).atom.nucleus, .02 * second,
      # 97% beta- 13.37; 2% alpha; 1% gamma 4.439
      (.97, 13.37e6, electron, Isotope(6, 6).atom.nucleus),
      (.01, 13.37e6 -4.439e6, electron, photon(4.439e6), Isotope(6, 6).atom.nucleus),
      (.02, 0, alpha, Isotope(3, 5).atom.nucleus))
decay(Isotope(5, .atom.nucleus, 17e-3 * second,
      # 92% beta- 13.44; 8% gamma 3.68
      (.92, 13.44e6, electron, Isotope(6, 7).atom.nucleus),
      (.08, 13.44e6 -3.68e6, electron, photon(3.68e6), Isotope(6, 7).atom.nucleus))
decay(Isotope(5, 9).atom.nucleus, 16e-3 * second,
      # 87% beta- 14.5; 90% gamma 6.09; 9% gamma 6.73
      (.87, 14.5e6, electron, Isotope(6, .atom.nucleus),
      (.9, 14.5e6 -6.09e6, electron, photon(6.09e6), Isotope(6, .atom.nucleus),
      (.09, 14.5e6 -6.73, electron, photon(6.73), Isotope(6, .atom.nucleus))

decay(Isotope(6, 3).atom.nucleus, .127 * second,
      # NAS gives 8.2 MeV p followed by 0.05 MeV alpha
      # beta+; 100% p
      (1, 0, positron, proton, Isotope(4, 4).atom.nucleus))
decay(Isotope(6, 4).atom.nucleus, 19.15 * second,
      # 99% beta+ 1.87; 99% gamma .718; 1% gamma 1.022
      (.99, 1.87e6, positron, photon(.718e6), Isotope(5, 5).atom.nucleus),
      (.01, .848e6, positron, photon(.718e6), photon(1.022e6), Isotope(5, 5).atom.nucleus))
decay(Isotope(6, 5).atom.nucleus, 20.38 * minute,
      (1, .96e6, positron, Isotope(5, 6).atom.nucleus))
decay(Isotope(6, .atom.nucleus, 5730 * year,
      (1, .156e6, electron, Isotope(7, 7).atom.nucleus))
decay(Isotope(6, 9).atom.nucleus, 2.45 * second,
      # 32% beta- 9.77; 68% beta- 4.47; 68% gamma 5.299
      (.32, 9.77e6, electron, Isotope(7, .atom.nucleus),
      (.68, 4.47e6, electron, photon(5.299e6), Isotope(7, .atom.nucleus))
decay(Isotope(6, 10).atom.nucleus, .75 * second,
      # NAS gives only beta- followed by neutron
      # 84% beta- 5.4; 100% n
      (.84, 5.4e6, electron, neutron, Isotope(7, .atom.nucleus),
      (.16, 0, neutron, Isotope(6, 9).atom.nucleus))

decay(Isotope(7, 5).atom.nucleus, .011 * second,
      # NAS only gives the beta-, followed 3% of the time by 3*alpha
      # 94% beta+ 16.3; 4% alpha; 2% gamma 4.439
      (.94, 16.3e6, positron, Isotope(6, 6).atom.nucleus),
      (.04, 0, alpha, Isotope(5, 3).atom.nucleus),
      (.02, 4.439e6, Isotope(7, 5).atom.nucleus))
decay(Isotope(7, 6).atom.nucleus, 9.96 * minute,
      (1, 1.19e6, positron, Isotope(6, 7).atom.nucleus))
decay(Isotope(7, 9).atom.nucleus, 7.14 * second,
      # 26% beta- 10.42; 68% beta- 4.29; 69% gamma 6.129; 5% gamma 7.115; 1% gamma .871
      (.32, 10.42e6, electron, Isotope(8, .atom.nucleus),
      (.68, 10.42e6 -6.13e6, electron, photon(6.13e6), Isotope(8, .atom.nucleus))
decay(Isotope(7, 10).atom.nucleus, 4.17 * second,
      # NAS gives 8.68 MeV beta-, followed 95% of the time by 1.21 MeV neutron
      # 2% beta- 8.7; 50% beta- 3.3; 95% n; 3% gamma .871
      (.02, 8.68e6, electron, Isotope(8, 9).atom.nucleus),
      (.5, 3.3e6, electron, neutron, Isotope(8, .atom.nucleus))
decay(Isotope(7, 11).atom.nucleus, .63 * second,
      # NAS gives 9.4 MeV beta- followed by 1.98 MeV gamma
      # 100% beta- 9.6; 100% 1.982; 72% gamma .82; 72% gamma 1.65
      (1, 9.6e6, electron, Isotope(8, 10).atom.nucleus))

decay(Isotope(8, 5).atom.nucleus, 8.7e-3 * second,
      # NAS gives beta+ always followed by 6.97 MeV proton
      # beta+ 16.7; 12% p
      (.88, 16.7e6, positron, Isotope(7, 6).atom.nucleus),
      (.12, 16.7e6, positron, proton, Isotope(6, 6).atom.nucleus))
decay(Isotope(8, 6).atom.nucleus, 70.6 * second,
      # 1% beta+ 4.12; 99% beta+ 1.81; 99% gamma 2.313
      (.01, 4.12e6, positron, Isotope(7, 7).atom.nucleus),
      (.99, 1.81e6, photon(2.313e6), positron, Isotope(7, 7).atom.nucleus))
decay(Isotope(8, 7).atom.nucleus, 122.1 * second,
      (1, 1.73e6, positron, Isotope(7, .atom.nucleus))
# NAS has more data ...

what = Isotope(110, 159).atom.nucleus
what.decays = ratedDecay(what, .27 * milli * second,
                         (1, None, alpha, Isotope(108, 157).atom.nucleus))

del what, Isotope, alpha, eV, Photon, proton, neutron, electron, positron, \
    ratedDecay, decay, photon, second, minute, day, year, milli











  kidding    anybody explain what it means and I'll by you a beer

[ZX10R-RACER]

yeah thats easy its all about electrons , protons and stuff

[davmail]

I knew a mathematician who got constipated................










He worked it out with a pencil.................

Sorry.

[Dale]

I can't believe you can't work it out.............a nine year old could do it.

[scooby]

yep, it's Decay data relating to unstable isotopes of elements.


next.........

[HammyUK]

Its all greek to me..................................................

[ZX10R-RACER]

is it me or could they be teaching more useful things?
skills that would help with a real world job

[doug_zx10r]

Since they're planning a lot of new nuclear power stations this stuff could be just the ticket for kids getting a job when they leave school.

[gr8t1]

[big_gaz]

[davemfox]

[gr8t1]

No i work at Sellafield Nuclear plant
i'm one of a team that stop west cumbria getting very effin hot very effin quickly - lol

no mad professor look - none of us have - we leave that to the nuclear physicists we're just neclear engineers - we jim'll fix it

and i love road racing been on bikes since i was 14yrs old - started with trials and crossing bought my first bike at 17 a nsr 125 and had loads since

currently without bike but loved me 10 so much am wanting another one as soon as pennies allow and after ryan faquaar's run on the superstock race at nw200 i'm very tempted for a new 10