April 2016
Intermediate to advanced
548 pages
19h 23m
English
Content preview from Ecological Sustainability
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227Mitigations of Human Impacts through Technology
4
He* → γ +
4
He + 24 MeV (probability ≅ 10
−6
) helium product
+ gamma ray (high-energy photon) (4.52)
When 1 W of nuclear power is produced from deuteron fusion consistent
with the known branching ratios, the resulting neutrons (n) and tritium
(
3
H) production are easily measured. The neutron ux for a 1 W reaction is
approximately 10
12
neutrons/s.
In T-T fusion, the reaction is
3
H +
3
H →
4
He + 2n + 11.3 MeV (4.53)
The tritium can come from the rst D-D fusion reaction. High-energy neu-
trons plus helium are produced.
Yet another fusion reaction uses two light helium atoms:
3
He +
3
He →
4
He + 2
p
+
+ 12.9 MeV (4.54)
Helium plus two positrons at 12.9 MeV are produced. The
3
He is produced ...
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