The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
Phosphorus-32
Cobalt-60
Carbon-14
Iodine-131
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PHOSPHORUS-32 is used for the treatment of leukemia.
IODINE-131 is used for the treatment of cancer of the thyroid gland.
CARBON-14 also known as radio carbon dating is used to know the age of artifacts.
COBALT-60 used for checking faults in cast and welding, and also for the treatment of cancer.

Please I don't understand is understanding chemistry now wrong because they chose iodine-131

The selected answer is wrong:
Cobalt-60 is widely used for checking faults in welds and castings
REF: check:New school chemistry, page333

B is correct. why?
Cobalt-60 is commonly used in industrial radiography because it emits high-energy gamma rays that can penetrate thick materials, allowing for thorough inspection of welds and castings.





