Mercuric iodide (HgI2) is a red-colored, crystalline powder that is commonly used as a semiconductor material in radiation detection devices. It has a high atomic number and high density, which make it well-suited for detecting ionizing radiation, such as X-rays and gamma rays.
Mercuric iodide is used in various types of radiation detectors, such as Geiger counters, scintillation detectors, and solid-state detectors. When ionizing radiation interacts with mercuric iodide, it produces electron-hole pairs that can be detected as a signal. The properties of mercuric iodide, such as its high sensitivity, high energy resolution, and low noise, make it a valuable material for radiation detection applications.