Obtain approximately the ratio of the nuclear radii of the gold isotope 19779Au and the silver isotope.

Q11 of 32 Page 462

Obtain approximately the ratio of the nuclear radii of the gold isotope ¹⁹⁷₇₉Au and the silver isotope.

We know that, R A^1/3 (where R is nuclear radii and A is the mass number)

∵ Hence,

So, the ratio of their radii will be

= 1.2256

Obtain the amount of ⁶⁰₂₇Co necessary to provide a radioactive source of 8.0 mCi strength. The half-life of ⁶⁰₂₇Co is 5.3 years.

The half-life of ⁹⁰₃₈Sr is 28 years. What is the disintegration rate of 15 mg of this isotope?

Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of (a) ²²⁶₈₈Ra and (b) ²²⁰₈₆Rn

Given m (²²⁶₈₈Ra) = 226.02540 u, m (²²²₈₆Rn) = 222.01750 u,

m (²²²₈₆Rn) = 220.01137 u, m (²¹⁶₈₄Po) = 216.00189 u.

The radionuclide ¹¹C decays according to

The maximum energy of the emitted positron is 0.960 MeV.

Given the mass values:

m (¹¹₆C) = 11.011434 u and m (¹¹₅B) = 11.009305 u,

calculate Q and compare it with the maximum energy of the positron emitted.