photofission


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photofission

(ˌfəʊtəʊˈfɪʃən)
n
(General Physics) physics the simultaneous release of energy and splitting of a large nucleus into smaller ones, caused by the absorption of a high energy photon
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Specific activity (Bq/mg) [sup.238]U (n,f) [sup.58]Ni (n, p) [sup.54] Fe(n,p) [T.sub.1/2] 30 years 71 days 313 days Measured * 5.345E + 1 1.786E + 4 9.342E + 2 Reference 4.54 E + 1 1.71E + 4 8.69E + 2 (DORT) ARES 4.37E + 01 1.73E + 04 8.73E + 02 Specific activity (Bq/mg) [sup.46]Ti (n, p) [sup.63]Cu (n, [alpha]) [T.sub.1/2] 84 days 5.3 years Measured * 3.500E + 2 2.646E + 1 Reference 2.96E + 2 2.39E + 1 (DORT) ARES 3.62E + 02 2.67E + 01 * The specific activity of [sup.137]Cs produced by [sup.238]U should be reduced by 5% to compensate for the photofission contribution for the reason that the dosimeters in the capsule were covered by 0.508 mm Gd cover.
For example, they do not count neutrons or gamma rays that would be generated by photofission even though 9-MeV photons can cause that effect.
The proposed deuteron reactions, however, are either qualitatively or quantitatively inaccurate--barring an unnatural burst of high energy photons (photofission).
(3) If the basic system is augmented by the capability to detect neutrons and gamma rays resulting from photofission, neutron detectors in this system would be able to detect neutrons when the beam is on because of the low neutron background.