Radiation measurement is a critical component in environmental chemistry because it allows the detection, quantification, and monitoring of radioactive contaminants in air, water, soil, and biota. Various instruments are employed to measure radiation, each with specific sensitivities, operational principles, and applications. The choice of instrument depends on the type of radiation being measured—alpha (α), beta (β), gamma (γ), or neutron radiation—as well as the required accuracy and environmental matrix. One of the most widely used instruments is the Geiger-Müller (GM) counter, which is a versatile device capable of detecting alpha, beta, and gamma radiation. It consists of a gas-filled tube with electrodes; when ionizing radiation passes through the tube, it ionizes the gas, producing a pulse of current that is counted and displayed. GM counters are highly useful for quick surveys of radiation contamination, field measurements, and area monitoring due to their portability and ease of use. However, they provide limited information on energy levels and are less sensitive to low-level radiation. Another commonly used instrument is the scintillation detector, which relies on the principle of scintillation, where certain materials emit light (photons) when exposed to radiation. Sodium iodide (NaI) crystals doped with thallium are typical scintillators used for gamma-ray detection. The emitted photons are converted into electrical signals by a photomultiplier tube. Scintillation detectors offer higher sensitivity than GM counters and can differentiate between different types of radiation based on energy spectra. They are frequently used in environmental monitoring of water and soil samples for radionuclide contamination,