The variable High-Voltage Power Supply 0-3kV

You’ll need a variable high-voltage supply to operate the detector.
The transformer is uncritical and easy to build. Use a E or EI core without air gap with an AL value of approx. 2000nH/W2. The primary coil has 25 windings of 0.7 - 1 mm magnet wire; the secondary coil has 500 windings of 0.2 - 0.3 mm magnet wire. Make sure that the insulation of the primary and secondary coil is well done. You should only use a plastic bobbin (Wickelkern in german) with 2 chambers - one for the primary coil the second chamber for the secondary coil.

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The variable High-Voltage Power Supply 0-3kV