The maximum exposure time for which one can be safely subjected to UV radiation is the threshold limit value (TLV).
HANDHELD UV HAZARD METER
The maximum exposure time for which one can be safely subjected to UV radiation
is the threshold limit value (TLV). The Handheld UV Hazard Meter's digital
display indicates the number of exposure hours to reach the TLV for the
UV source being measured. Areading above 8 hours indicates that there is
no hazard in a working day.