Iodine-131 (

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

Iodine-131 (

T_{1/2}=8.0\,\text{d}

, atomic mass

=131\,\text{g\,mol}^{-1}

) is to be prepared with an activity of

5.0\,\text{MBq}

just after production. What mass of

^{131}

I must be taken? (a)

0.76\,\text{ng}

(b)

1.1\,\text{ng}

(c)

11\,\text{ng}

(d)

0.046\,\text{ng}