Question

6. The isotope plutonium- 239 undergoes alpha decay. Write the reaction equation and determine the identity of the daughter nucleus.

7. The isotope silver- 107^{*} undergoes gamma decay. Write the reaction equation, and determine the identity of the daughter nucleus.

14. Iodine-131, a beta emitter, has a half-life of 8 days. A 2-gram sample of initially pure iodine-131 is stored for 32 days. How much iodine-131 remains in the sample afterward?

15. An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life of 3 days. If the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe to enter?

Answer 1

239 Q.b espu u + He whon plutonium- 239 under go alph decay a dauguter nucleous coranium-735 is of querated- - D A7 + 8 radiation B.14 Here half life Ty2 = 8 day houce in 32 days there are 4 haff life. So, after 32 day remaining amount is given as 6x2 gram = 17/18 = 3 gram Q. Is here (oxyth=x n=3, hence 3 half life is require meant 3x3=9 day