Liquid scintillation counting (LSC) is a radiometric technique used to measure the activity of low-energy radioisotopes, particularly beta emitters such as tritium (³H) and carbon-14 (¹⁴C). The sample is mixed with a liquid scintillation cocktail that converts the energy of emitted particles into light pulses, which are then detected and quantified by a liquid scintillation counter. This method is essential in fields like biological research, environmental monitoring, pharmaceutical development, and nuclear safety.