If it were necessary to radiograph 18 cm (7 in.) thick steel product, – McqOptions

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1.	If it were necessary to radiograph 18 cm (7 in.) thick steel product, which of the following gamma ray sources would most be used?
A.	Cs 137
B.	Tm 170
C.	Ir 192
D.	Co 60
Answer» E.

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