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Iodine-131 is a radioactive isotope that is used as a medical tracer to study and treat the thyroid gland. This radioactive element emits both beta particles and gamma waves. To effectively stop both beta
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Iodine-131 is a radioactive isotope that is used as a medical tracer to study and treat the thyroid gland. This radioactive element emits both beta particles and gamma waves. To effectively stop both beta particles and gamma waves, scientists use a chamber composed of...

A) concrete.
B) lead.
C) metal. (Not this one)
D) plastic. (Not this one)

I believe the answer is B, can someone confirm?

User Brent Heigold
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bonjeur monseur, la french are here! it seems you have a problem with the elements on earth. lead seems correct since it is indeed a harmful material
User Barry Carlyon
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