One of the fission products that causes major concern is Sr - 90, since it is in

Question

One of the fission products that causes major concern is Sr - 90, since it is incorporated into milk and other high - calcium foods. Sr - 90 undergoes beta decay with a half - life of 28.1 years. What percentage of the Sr - 90 that was formed in the detonation of the first fission bombs in August 1945 is still present in the environment in August 1984? What is the ratio of enrichment of U - 235 after 38 diffusions of UF6 When 239Pu is used in a nuclear reactor, one of the fission events that occurs is The atomic mass of each atom is given below its symbol in the equation. Find the energy released (in kJ) when 7.50 g of plutonium undergoes this particular fission. Hint given in feedback.

Explanation / Answer

Q1 Step1 t1/2 = 28.1 yrs = ln2/k =.6931/k

Step2 39 = ( 2.303/k) log [Co/C]

Step3 Divide eq in step 2 by step 1

Step4 (2.303/.6931) log [Co/C]= 39/28.1 or C/Co =.3822 = 38.22%

Q2 Step1 U235/U238 = (M238/M235)^1/2

Step2 After 38 diffusions = (M238/M235)^(1/2)*38 = (M238/M235)^19 =(238.0508/235.0493)^19= 1.2726

Q3 Step1 Mass Defect = 3.219 amu = 2.997x10^3 Mev

Step2 Total Energy [= (7.50x6.023x10^23)/239.052 ] x 2.997x10^9 eV =5.663x10^31eV = 5.663x10^31 x 1.6x10^-19 J =9.061x10^12 J = 9.061x10^9 kJ

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