Question

Classify each of the following nuclides as either "beta $\left({}_{-1}^0\beta \right)$ emitter", or "positron $\left({}_{+1}^0\beta \right)$ emitter" :

${}_{20}^{49}\text{Ca}$	${}_5^8\text{B}$	${}_{13}^{30}\text{Al}$
${}_{80}^{195}\text{Hg}$	${}_{67}^{150}\text{Ho}$	${}_{36}^{94}\text{Kr}$

Note : ${}_{36}^{84}\text{Kr}{;}_{80}^{200}\text{Hg}$ and $\_{67}^{165}\text{Ho}$ are stable

• A. beta emitter : ${}^{49}Ca,{}^{30}Al{,}^{94}Kr,$ positron emitter : ${}^{195}Hg{,}^{8}B{,}^{150}Ho$
• B. beta emitter : ${}^{49}Ca,{}^{8}B{,}^{94}Kr,$ positron emitter : ${}^{195}Hg{,}^{30}A{,}^{150}Ho$
• C. beta emitter : ${}^{150}Ho,{}^{30}Al{,}^{94}Kr,$ positron emitter : ${}^{195}Hg{,}^{8}B{,}^{49}Ca$
• D. beta emitter : ${}^{49}Ca,{}^{30}Al{,}^{195}Hg,$ positron emitter : ${}^{94}Kr{,}^{8}B{,}^{150}Ho$

Answer 1

The correct option is A beta emitter : ${}^{49}Ca,{}^{30}Al{,}^{94}Kr,$ positron emitter : ${}^{195}Hg{,}^{8}B{,}^{150}Ho$

beta emitters are ${}^{49}Ca,{}^{30}Al{,}^{94}Kr,$ while positron emitters are ${}^{195}Hg{,}^{8}B{,}^{150}Ho$

When the ratio $\frac{n}{p}>1.5$ , beta emission occurs which decreases $\frac{n}{p}$ ratio.

When $\frac{n}{p}<1,$ alpha emission or positron emission or K-shell electron capture occurs to increase $\frac{n}{p}$ ratio.