Chapter 8, Problem 8.6P

To determine

The inhalation DAC for Co-60 using ICRP 60(S) criteria

Answer to Problem 8.6P

The inhalation DAC is $2.87\times {10}^2\frac{Bq}{m^3}$

Explanation of Solution

Given info:

The particle size is $1\mu m$

The annual dose limit is $0.02Sv$

Formula used:

  $\begin{array}{l}ALI(inhalation)=\frac{Annualdoselimit}{Committedeffectivedosecoefficient}\\ DAC=\frac{ALI\frac{Bq}{yr}}{refferencewokerinhales}\end{array}$

The committed effective dose coefficient of Co-60 using ICRP 60(S) for $1\mu m$ size particle is $2.9\times {10}^{-8}\frac{Sv}{Bq}$

Calculation:

  $\begin{array}{l}ALI(inhalation)=\frac{0.02\frac{Sv}{yr}}{2.9\times {10}^{-8}\frac{Sv}{Bq}}=6.8966\times {10}^5\frac{Bq}{yr}\\ DAC=\frac{6.8966\times {10}^5\frac{Bq}{yr}}{2400\frac{m^3}{yr}}=2.87\times {10}^2\frac{Bq}{m^3}\end{array}$

Conclusion:

The inhalation DAC = $2.87\times {10}^2\frac{Bq}{m^3}$