**1 Ci = 3.7 x 10 ^{10} disintegrations per second **

**1 rad = 0.01 or 10 ^{-2} J/kg**

**1 rem = QF x rad**

**Biological damage factor (alpha particle) = 20**

$\mathbf{2}\mathbf{}\overline{)\mathbf{pCi}}\mathbf{\times}\frac{{\mathbf{10}}^{\mathbf{-}\mathbf{12}}\mathbf{}\overline{)\mathbf{Ci}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{pCi}}}\mathbf{\times}\frac{\mathbf{3}\mathbf{.}\mathbf{7}\mathbf{\times}{\mathbf{10}}^{\mathbf{10}}\mathbf{}\mathbf{disintegrations}\mathbf{}\mathbf{per}\mathbf{}\mathbf{second}}{\mathbf{1}\mathbf{}\overline{)\mathbf{Ci}}}\mathbf{=}$**0.074 disintegrations per second**

**Absorbed dose (rad):**

Tests on human subjects in Boston in 1965 and 1966, following the era of atomic bomb testing, revealed average quantities of about 2 pCi of plutonium radioactivity in the average person.

If each alpha particle deposits 8 x 10^{ - 13} J of energy and if the average person weighs 76 kg , calculate the number of rads and rems of radiation in 4 yr from such a level of plutonium.

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