Question

which of the following nuclides can be classified as positron emitter
hg, sn, ca, pb​

Answer 1

Explanation:

beta emitters are

49

Ca,

30

Al,

94

Kr, while positron emitters are

195

Hg,

8

B,

150

Ho

When the ratio

p

n

>1.5 , beta emission occurs which decreases

p

n

ratio.

When

p

n

<1, alpha emission or positron emission or K-shell electron capture occurs to increase

p

n

ratio.