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Question

(A) The activity of $1 \ g$ of $^{226}Ra$ is defined as $1 \ Ci = 3.7 	imes 10^{10} \ 	ext{disintegrations per second (dps)}$.Therefore,the activity

Vedclass · Accepted Answer

$3.62 	imes 10^4 / \sec$

Vedclass · Answer

(A) The activity of $1 \ g$ of $^{226}Ra$ is defined as $1 \ Ci = 3.7 	imes 10^{10} \ 	ext{disintegrations per second (dps)}$.Therefore,the activity of $1 \ \mu g$ $(10^{-6} \ g)$ of $^{226}Ra$ is $3.7 	imes 10^{10} 	imes 10^{-6} = 3.7 	imes 10^4 \ dps$.Since each disintegration of radium emits one alpha particle,the number of alpha particles emitted per second is approximately $3.7 	imes 10^4 \ dps$.Comparing this with the given options,the closest value is $3.62 	imes 10^4 / \sec$.

How many alpha particles are emitted per second by $1 \ \mu g$ of radium?

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