Everything about Orange Herald totally explained
Orange Herald was the name of a
British nuclear weapon of the
1950s.
Technical
Orange Herald was a fusion boosted British
fission nuclear weapon, comprising a
U-235 primary surrounded by
Lithium deuteride. 'Herald' was suitable for mounting on a missile, utilizing 117 kg of U-235. However, Britain's annual production of U-235 was only 120 kg at this time, which would have made such weapons rare and very expensive.
This device yielded 720
kT of explosive power in the
Grapple 2/Orange Herald tests on
Malden Island in the Pacific, and remains the largest fission device ever tested. It is thought that the fusion boosting failed to increase the yield.
Orange Herald was the first British nuclear device to use an external neutron source.
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Britain rushed the development of these predicted-
megaton class weapons as in 1955 it seemed that atmospheric testing could soon be outlawed by treaty, and it wanted to demonstrate its capability before it wouldn't be able to do so legally.
Further Information
Get more info on 'Orange Herald'.
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