Radioactive particles are tiny bits of matter that emit radiation due to the instability of their atomic nuclei. These particles can come from various sources, including natural elements like uranium and radon, as well as man-made materials used in medical and industrial applications. When these particles decay, they release energy in the form of alpha, beta, or gamma radiation. Exposure to radioactive particles can pose health risks, as they can damage living cells and increase the likelihood of cancer. Safety measures, such as shielding and distance, are essential when working with or around these particles to minimize potential harm.