Urgernt please Urgernt please Urgernt please Urgernt please Urgernt please Urger

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2. A radionuclide decays from 360 Ci to 135 Ci in 50 years. What is its decay constant ( A) 0.0196/year; B) 0.0196 year; C 3 year; D 3/year 3. In UNF, the amount of which elements increases with cooling time from 3 years to 5 years () A. U-234; B)Pu-238; C)Am-241; D)Pu-240 4. The two main functions of voloxidation in PUREX are: ( A. reducing the size of fuel particles; B) converting U dioxide into UF6; C) removing tritium; D) Separating actinides from fission products. 5. A radionuclide decays from 360 Ci to 135 Ci in 50 years. What is the radionuclide half- life() A) 35.3 years; B) 50.6 years; C) 50.6/year; D)35.3/year 6. The mass in grams of 1 Ci of Am-241 (half-life-4327 years) ?s( ) A) 0.133 g; B) 0.458 g; C) 0.630 g; D) 0.288 g 7. The biological half-life of Se-75 is 150 days and the radiological half-life is 120 days What is the effective half-life ( A 86.1 days; B) 93.5 days; C) 66.7 days; D)57.6 days 8. Which processes (s) need(s) off-gas treatment system () A. Fuel shearing; B) Voloxidation; C) Dissolution; D) UNF transportation 9. During PUREX, where the special nuclear material is measured for safeguarding purpose: () A. Shearing system; B) dissolution tank; C) Centrifugal contactor; D) accountability tank 10. For standard voloxidation, which sentence (s) is (are) right: () A. The operation temperature is 1000 oC B. Some Carbon (C-14) is released C. Some I-129 and Kr-85 are released D. Preventing Tritium from entering into the separation facility

Explanation / Answer

Ans 2

For the decay of radioactive substance

Nt = N0 x exp (-kt)

No = Initial amount of radioactive substance = 360"Ci

k = decay constant =?

t = time taken = 50 years

Nt = Amount of radioactive substance present after time t

= 135 Ci

135 = 350 x exp(-50k)

0.3857 = exp(-50k)

0.9527 = 50k

k = 0.01905 / year

Option A is the correct answer

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