Used as a scintillator material in high-energy physics experiments due to its high density, fast light emission, and radiation hardness. Commonly found in electromagnetic calorimeters, especially in particle detectors like those at the Large Hadron Collider (LHC), where it helps measure the energy of photons and electrons. Its ability to operate in strong magnetic fields and withstand high radiation levels makes it ideal for use in collider experiments. Also investigated for applications in medical imaging and X-ray detection due to its good stopping power and fast response time. Additionally, it is used as a yellow pigment in ceramics and glass products, though its application is limited due to the toxicity of lead.