when uranium 238 is bombard by neutron >>> uranium 238
, undergoes B decay>>>Np 239 ,undergoes B decay
>>> Pu 239 finally undergoes alpha decay >>>
fissile U
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Usually boron is alloyed with steel, boron is a very good
neutron absorber.
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A boron steel alloy is the most common material used, boron is
the neutron absorber.