**Core Concept**
Phosphorus-32 (P-32) is a radioactive isotope of phosphorus that undergoes nuclear decay. It is a beta emitter used in various medical and scientific applications, including research and diagnostic imaging.

**Why the Correct Answer is Right**
Phosphorus-32 decays by beta minus (β-) emission, which involves the conversion of a neutron to a proton, an electron, and a neutrino. This process results in the emission of a beta particle (an electron) from the nucleus of the phosphorus atom. The beta particle is emitted with a specific energy, which is a characteristic of the radioactive isotope.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because phosphorus-32 does not emit alpha particles, which are positively charged particles emitted by certain radioactive isotopes, such as radon-222.
**Option B:** This option is incorrect because phosphorus-32 does not emit gamma rays, which are high-energy electromagnetic radiation emitted by radioactive isotopes during their decay.
**Option C:** This option is incorrect because phosphorus-32 does not emit positrons, which are positively charged particles emitted by certain radioactive isotopes, such as carbon-11.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that radioactive isotopes like phosphorus-32 have specific half-lives and decay modes, which are crucial for their safe handling and use in medical and scientific applications.

**Correct Answer:** C. Beta particle