Question

Problem 2) Suitcase Bomb

Calculate how many grams of Plutonium-239 would be needed to build
a ’suitcase bomb’ with a yield of 2 kilotons. Assume 3 neutrons are
generated per fission, that every atom fissions, and that each
fission produces 212 MeV.

Answer #1

A yield of 1 kiloton is equivalent to of energy thus a yield of 2 kiloton is equal to of energy.

Also

Thus net energy required in MeV is,

Also 1 fission produces 212 MeV.

Thus number of fission's required is

and thus N number of atoms are required for it and converting it to moles we get,

Thus the grams of Plutonium atoms required will be,

where 239 is the atomic weight of Plutonium

is required for the sitcase bomb yield of 2 kilotonnes.

A 53 kiloton atomic bomb is fueled with pure 235U,
4.0% of which actually undergoes fission. (a) What
is the mass of uranium in the bomb? (It is not 53 kilotons - that
is the amount of released energy specified in terms of the mass of
TNT required to produce the same amount of energy.)
(b) How many primary fission fragments are
produced? (c) How many neutrons generated in the
fissions are released to the environment? (On average, each fission...

QUESTION 1
Calculate the k-factor, to 2 decimal places, for a reactor in
which:
3% of the neutrons are fast neutrons which produce a fission
in the fuel,
5% of the fast neutrons escape from the reactor,
3% of the slow neutrons escape from the reactor,
29.8% of the neutrons are absorbed in the moderator before
becoming thermal,
31.8% of the thermal neutrons get absorbed into the moderator
and other material,
Each original thermal neutron produces, on average, 2.08
fissions...

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