Radiological Safety
XV
2.
Source Shutter closed - The radiation levels are less than 0.05
MR/HR at distances greater than 5 cm from any surface of the
gauge (including inside the tunnel).
3.
Source Shutter open - The extent of the main gamma beam is
completely contained within the tunnel formed by the
inspection head and shielding bar. All radiation levels outside
the main beam are less than 0.05 MR/HR.
4.
The exposure rate in the main beam is measured to be approxi-
mately 60 MR/HR at 5 cm from source enclosure containing
300 millicuries.
Industrial Dynamics Company, Ltd. Document 40255-0600
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