Which type of gamma ray source would be used to radiograph a weld in 150 mm thick steel plate?

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Mr. Dubey

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Q. Which type of gamma ray source would be used to radiograph a weld in 150 mm thick steel plate?

(A) Ir-192
(B) Co-60
(C) Tm-170
(D) Cs-137

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✅ Correct Answer: (B) Co-60

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