Discussion
Liquid scintillation counting is used for measurement of radioactivity of :
Answer: A
Liquid scintillation counting is used for \(^{14}\text{C}\).
Carbon-14 (like tritium and sulphur-35) emits only weak beta particles, which travel a fraction of a millimetre in a sample and are absorbed before they could reach an external detector. In liquid scintillation counting the sample is dissolved in a cocktail containing a fluor, so every beta particle excites the solvent close to where it is emitted. The flashes of light are counted by photomultiplier tubes.
Iodine-131 and the chromium isotopes used as labels emit penetrating gamma rays and are measured in a gamma counter with a sodium iodide crystal. Uranium-235 is an alpha emitter used as nuclear fuel, not as a biological tracer.
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