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CDV-715 Retro Digital Geiger Counter : Page 20

Figure 20 Finished Project

CDV-715 Retro Digial Geiger Counter

Going Further:

Here are a few things you can do to improve our Retrofit Geiger counter project.

One cut holes or louvers by the GM tube to improve the sensitivity of the GM Tube. The metal can of the enclosure blocks alpha radiation and attenuates beta radiation and gamma radiation. If one is using an Alpha Sensitive tube like the LND 712, you should drill a 1/2" hole in the case to allow the MICA window to see outside the case. A screen should cover this hole to help protect the sensitive mica window while still allowing it to see alpha radiation.

The GCK-02 Geiger counter PCB has an LED that flashes with each detected radioactive particle. This LED can be made external to the PCB and placed in the top cover of the case.
In the same manner the speaker can be extended and made external.

Parts List:

CDV-715 (see text)
Analog Digital Meter $45.55
Front Faceplate ($6.00)
GCK-02 Kit $65.10 (no tube)


Rotary Switch CKM9487-ND (Digi-key) or equivalent 9V battery holder
3/8-1/2" plastic cable clip to hold gm tube
br/> (4) 3/4" Hex spacers
(4) 0-80 Machine screws 1" length
(4) 0-80 machine screw nuts.

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