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However, the Geiger–Müller tube produces a pulse output which is the same magnitude for all detected radiation, so a Geiger counter with an end window tube cannot distinguish between α- and β-particles. [4]
Schematic of a Geiger counter using an "end window" tube for low-penetrating radiation. A loudspeaker is also used for indication. For alpha particles, low energy beta particles, and low energy X-rays, the usual form is a cylindrical end-window tube. This type has a window at one end covered in a thin material through which low-penetrating ...
The CD V-700 (often written as "CDV-700") is a Geiger counter employing a probe equipped with a Geiger–Müller tube, manufactured by several companies under contract to United States federal civil defense agencies in the 1950s and 1960s. While all models adhere to a similar size, shape, coloring and form-factor, there were substantial ...
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For instance, a Geiger end-window instrument cannot discriminate between alpha and beta, but moving the detector away from the source of radiation will reveal a drop off in alpha as the detector tube must normally be within 10mm of the alpha source to obtain a reasonable counting efficiency.
Schematic of a Geiger counter using an "end window" tube for low penetration radiation. A loudspeaker is also used for indication. Proportional counters and end-window Geiger-Muller tubes have a very high efficiency for all ionising particles that reach the fill gas.