Photodiode Gamma Detector

A pin photodiode four low noise op amps and a comparator are used to detect individual photons of gamma radiation. Gamma photon radiation detector sep 22 2003 abstract.

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Another requirement when using a photodi ode as a beta and gamma radiation detector is that light must be completely excluded as otherwise the photocurrent will over.

Photodiode gamma detector. At 100 kev in silicon detectors. The circuit of figure 1 includes a pin photodiode that detects individual photons of gamma radiation. That means that if a high energy gamma photon is absorbed a detectable signal of approximately 105 electrons is generated.

Youll have a very long wait if you want geiger tubes to go away. The photodiode is actually sensitive enough to detect the small amounts of gamma radiation produced from a smoke alarm americium source and also registers alans other more powerful. The schematic design considerations and component selection are discussed.

As shown in the schematic the photodiode and first stage of amplification need to be shielded with foil to eliminate light and electrical noise. The photodiode is considerably smaller than that normally obtained from a counter tube and so a very low noise instrumentation amplifier circuit is needed. Yet at the same time the amount of charge carriers released upon absorption of a gamma photon increases linear with gamma energy at a rate of about 1 pair per 37 ev.

This offers the possibility of cheap small and rugged radiation detectors of reasonable sensitivity. Because of this it can only detect gamma rays or cosmic radiation which is super charged alpha particles. Silicon diodes can only pick up certain types of energy mostly gamma.

This opengeiger device is mostly useless as a general purpose radation detection device. Photodiode gamma ray detector gamma photons interacting with cheap photodiodes produce small current pulses which are easily amplified and allow detection of individual photon events. Youre never going to pick up alpha radiation with a pin diode.

For fun lets discuss another way to think of this detector.

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