Ariz. Admin. Code § R11-1-472 - Concentration of Radon Daughters
When radon daughters concentrations between 0.1 and 0.3 WL are found in an active working area, measurements representative of worker's breathing zone shall be determined as follows:
1. Where uranium is not mined -- at least
three months at random times until concentrations are below 0.1 WL and annually
thereafter.
2. Where uranium is
mined -- at least every two weeks at random times at all areas where persons
work, travel or congregate. If concentrations are found in excess of 0.3 WL in
an active working area, radon daughters concentrations shall be determined
weekly until such time as the weekly determinations have been 0.3 WL or less
for five consecutive weeks.
3.
Sample date, locations and results obtained shall be recorded and retained at
the mine office for at least two years and shall be made available for
inspection.
Notes
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