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In natural uranium, only seven nuclei in every 1,000 are of this fissile sort.
The spectrometer can thus distinguish between, say, 235U (the fissile sort, from which bombs are made) and 238U (which has three extra neutrons in its nucleus and is much less fissile).
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That matters, because the nuclear reaction which turns the non-fissile form of uranium into fissile plutonium, from which bombs can be built, makes antineutrinos.
Another is to separate fissile uranium from the inert sort in a gas centrifuge.
Experts calculate that it would need about 1,500 P-1 centrifuges, configured to produce highly enriched uranium rather than the civilian sort, to produce enough fissile material for a bomb a year.
For instance, it is possible to discern whether a nuclear reaction consisted of fission (the splitting of heavy atoms) or also of fusion (the merging of light atoms), whether the fissile material was uranium or plutonium, and even, if both sorts of reaction took place, whether they began physically near or apart from each other.
That set off alarms, because a country that has mastered making low-enriched uranium for reactor fuel just has to spin its machines in different formation to produce the high-enriched stuff for a bomb; plutonium can be extracted from nuclear wastes and expensively reused in special sorts of fuel, but it can also be fashioned into the fissile core of a weapon.
The MSR is a sort of circulating fuel reactor (CFR), which adopts a molten halide salt mixture containing the fissile material and playing the distinctive role of both fuel and coolant.
MEND is a fissile organisation.
Is Saddam fissile or fissible?
Alternatively the fissile material can be made at home.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com