A 10 cubic meter particulate air sample collects 0.1 millicurie of cobalt-60 on

Question

A 10 cubic meter particulate air sample collects 0.1 millicurie of cobalt-60 on its filter. What is the airborne radioactivity concentration? Using 10 CFR 20, if the particles are composed of cobalt oxide, how many DAC does this represent? A radiochemist wants to carry a small vial containing 1 times 10^9 Bq of cobalt-60 solution from one laboratory fume hood to another. If the estimated carrying time is 3 minutes, what would be the minimum length of the tongs used to carry the vial in order that his dose not exceed 30 mrad during the operation?

Explanation / Answer

Volume of air particulate=10m3

Amount collected in filter=0.1millicurie of cobalt-60

Air borne radioactivity concentration=0.1/10=0.01millicurie/m3

When 10CFR20 is used and when particles are found to be composed of cobalt oxide,the amount of DAC present will be more because cobalt oxide consists of more amount of particulate matter and is radioactive in nature and the concentration increases than normal value.

Amount of cobalt-60=1*109Bq

Time taken=3minutes

Minimum length of tongs=(109/3)=36.33

The dose should not exceed 30mrad=36.33/30=1.211

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