 Radiation detection

Radiation detection makes interactions of ionizing radiation with matter into observable signals. An ionization chamber collects charge created in a gas; a scintillation detector converts deposited energy into light; a semiconductor detector measures charge carriers created in a solid. The instrument detects interactions, so its response depends on radiation type, energy and geometry.

For an ideal counting model, expected detected events satisfy $N=\epsilon Rt$, where $R$ is the relevant incident event rate, $t$ is observation time and $\epsilon$ is detection efficiency. Background adds counts, while dead time can lose them. Estimating a source's radioactive activity therefore requires calibration and a model of emissions and transport, rather than equating the displayed count rate with decay rate.

Radiation detection refers to the methods and technologies used to identify and measure the presence of ionizing radiation, which can include alpha particles, beta particles, gamma rays, and X-rays. The goal of radiation detection is typically to assess radiation levels in the environment, monitor exposure to individuals, safeguard against radiation hazards, and ensure compliance with safety regulations. Radiation detection devices, known as radiation detectors, come in various types, each suited for specific applications.