Page 89 - Quick Guide to Welding and Weld Inspection by S.E. Hughes, Clifford Matthews
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A Quick Guide to Welding and Weld Inspection
Figure 6.4 Radiographic testing
such as yturbium and (for thicker materials 40 mm+) cobalt
60. Cobalt 60 is incredibly dangerous and should only really
be used when iridium 192 is impracticable. It is a good idea to
finish having all the children you want before using cobalt 60
or, better still, get someone else to use it and keep well back.
On a more serious note – treat it with great respect. The
sources are contained in carriers made from depleted
uranium and are only wound out for the required exposure
time.
Quality of the radiographic film is measured using four
main parameters:
74
Woodhead Publishing Ltd – A Quick Guide to Welding and Weld Inspection
Data Standards Ltd, Frome, Somerset – 17/9/200906QG Welding chap6.3d Page 74 of 87
