Γ 光子辐射探测器

比较器用来检测单个光子的伽马辐射。示意图、 设计注意事项和组件选择进行讨论。
Maxim/Dallas > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS AUTOMOTIVE
MEASUREMENT CIRCUITS

Keywords: gamma ray, photon, radiation detector, low noise op amp, PIN, photodiode, gamma radiation, Jul 21, 2003
operation amplifiers, op amps, comparator

APPLICATION NOTE 2236
Gamma-Photon Radiation Detector

A PIN photodiode, four low-noise op amps and a comparator are used to detect individual photons of gamma
radiation. The schematic, design considerations and component selection are discussed.


The circuit of Figure 1 includes a PIN photodiode that detects individual photons of gamma radiation. When a
photon strikes a depletion region created by reverse bias on the photodiode, it produces a small amount of
charge in proportion to the photon's energy. The resulting signal is then