91Ó°ÊÓ

$mrad$corresponds to the dose absorbed.

(part a) $mrad$: A typical unit for measuring absorbed dose is the $mrad$.

$1$$rad$equals $1,000$$mrad$.

$Gray$is the $SI$unit for absorbed dosage ($Gy$).

The following is the relationship between $grey$and $rad$:

$1Gy=100\mathrm{rad}$

As a result, option $\left(a\right)$corresponds to option $\left(2\right)$.

$gray$corresponds to the dosage absorbed.

(part b) $Gy\left(gray\right)$Sl unit for absorbed dosage is $gray$$\left(Gy\right)$.

The $rad$is a popular unit for measuring absorbed dosage.

The absorbed dose is measured in $rad$.

The following is the relationship between $gray$and $rad$:

$1Gy=100\mathrm{rad}$

As a result, option $\left(b\right)$corresponds to option $\left(2\right)$.

$becquerel$corresponds to activity.

(part c) $becquerel$: is a unit of measurement for radiation activity.

$Curie$is a popular unit of activity measurement. The $becquerel$is the $Sl$unit for activity.

The following is the relationship between Curie and Becquerel:

$1\mathrm{Ci}=3.7×{10}^{10}\mathrm{Bq}$

As a result, option $\left(c\right)$corresponds to option $\left(1\right)$.

Biological harm matches $Sv$.

(part d) $sievert\left(Sv\right)$: is a biological damage measurement unit.

The $sievert$is a unit of measurement for biological harm.

$1sievert=100rem$

As a result, option $\left(d\right)$is compatible with option $\left(3\right)$.