Radiographic Testing Level 2 (RT-2) General Practice Exam

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What is the approximate half-life of Cs-137?

15.1 years

30.1 years

The half-life of Cs-137, or cesium-137, is widely accepted to be approximately 30.1 years. This means that after this period, half of a given quantity of Cs-137 will have decayed into its daughter isotope, barium-137. Understanding the half-life is crucial in radiographic testing and other applications because it helps professionals estimate how long a radioactive material remains hazardous and informs safe handling and disposal practices.

Cs-137 is a byproduct of nuclear fission processes and is used in various applications, including medical treatments and industrial radiography. Knowing its half-life aids in planning exposure limits and understanding the longevity of its radiological impact on both equipment and human safety. In contrast, the other options represent half-lives associated with different isotopes or are simply inaccurate figures for Cs-137.

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45.6 years

60.1 years

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