An example of a isotope that is predominantly a beta emitter is
**Core Concept**
Radionuclides are atoms with unstable nuclei that undergo radioactive decay, emitting radiation in various forms. Beta particles are high-energy electrons emitted from the nucleus, and certain isotopes predominantly emit beta radiation.
**Why the Correct Answer is Right**
Iodine-131 is a radioactive isotope of iodine that undergoes beta decay, emitting beta particles (β-) to become xenon-131. This process is a result of the unstable nucleus undergoing electron capture or beta minus decay, where a neutron is converted into a proton, and an electron is emitted. I-131 is commonly used in nuclear medicine for diagnostic and therapeutic purposes, particularly in the treatment of thyroid cancer.
**Why Each Wrong Option is Incorrect**
**Option A:** None provided (assuming blank).
**Option B:** None provided (assuming blank).
**Option C:** None provided (assuming blank).
**Clinical Pearl / High-Yield Fact**
Iodine-131 is a potent radioactive isotope that can be used therapeutically to destroy thyroid tissue, but it also has a relatively short half-life of approximately 8 days, requiring careful handling and administration to minimize radiation exposure.
**Correct Answer:** C. Iodine-131.