CDPH Lead Inspector/Assessor California State Practice Exam

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What is the half-life of Cobalt-57?

100 days
180 days
270 days
365 days

The correct answer is: 270 days

The half-life of Cobalt-57 is indeed approximately 271.79 days, which can be rounded to 270 days for practical purposes. Understanding half-life is essential in fields like environmental science and health, particularly when dealing with radioactive isotopes. Cobalt-57 is often used in medical diagnostics, particularly in nuclear medicine for imaging and radiotherapy, as well as in industrial applications. The specific half-life is critical for professionals, such as lead inspectors or assessors, to determine how long a radioactive substance remains active and poses a potential health risk. This knowledge helps in planning safe handling and disposal procedures, thus reinforcing safety protocols in environments that may have been exposed to radiation.