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Quantum Mechanics is the branch of physics dealing with discrete, indivisible units of energy called quanta as described by the Quantum Theory. It explores phenomena on a very small scale, such as molecules, atoms and subatomic particles like electrons, protons, and photons. Radiation itself can be explained through quantum mechanics - for instance, gamma rays, which are high-energy photons, follow quantum mechanical principles. Quantum Mechanics also delves into the behavior of matter and energy at this scale, encompassing concepts like wave-particle duality, superposition, and quantum entanglement. The field is fundamental to understanding modern physics, including nuclear physics, particle physics, and condensed matter physics, thereby solidifying its place within the Science/Physics/Radiation hierarchy.