as dry, moist, wet, and saturated for each test location.
1-36. RADIATION SAFETY
Draw "contour" lines between the values to enclose each
Density is not a factor on the roof, therefore the shutter
given value area. A moisture pattern is immediately
will be kept closed and gamma radiation beneath the
tester is negligible.
For additional clarity, color the enclosed areas with a
A typical industrial built-up roof will be more than 8'
specific color pencil to designate the various moisture
above head height of occupants of space beneath the
0.025 mrem/hr. Since the tester is constantly being
Intelligent action can now be taken as to where repairs
moved from test spot to test spot, there is no radiation
should be commenced on the roof and over what area.
danger presented to occupants of the building during
It may be obvious where the moisture is coming from...
testing and no special provisions should be taken for
flashing, a previously unobserved puncture, crack, or low
spot, once the pattern is drawn.
The operator will take many readings in a day, however,
and good practice dictates stepping back from the tester
5' or more while the tester is counting.