| http://www.w3.org/ns/prov#value | - e normal high water level. (5) Irradiator pools must be equipped with a purification system designed to be capable of maintaining the water during normal operation at a conductivity of 20 microsiemens per centimeter or less and with a clarity so that the sources can be seen clearly. (6) A physical barrier, such as a railing or cover, must be used around or over irradiator pools during normal opera
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