It takes 0.357 days to produce 1 kilogram of 239Pu if the time period reaction is finished so when product is 90% 239Pu.
The half-life of the a radioactive isotope is the length of time it takes for one half of the isotope to decay. A particular radioactive isotope's half-life is constant, unaffected by environmental factors, and irrespective of the initial concentration of the isotope.
2.35 days make up the half-life of 239Pu.
K = ln2/t0.5 = 2.35 ln 2/ K = 0.294956/day
N₀ = 1 kg
Na = 0.91 kg, and K = 1/t ln. N0/Na t=1/K ln(N0/Na) t=0.357 days
As a result, the duration is 0.357 days.
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