[morninglight]

Do a search for "MightyOhm Geiger Counter Kit Bundle" and you will find a stand alone version of the same circuit along with photos. Although the PCB has a "High Voltage" label, it is powered by 2 X AAA batteries which are might be very lethal if ingested.\s

[morninglight]

Here it is -

https://mightyohm.com/files/geiger/images/6275026497_3cf9f17...

[vegadw]

Powered by 2x AAA batteries != not high voltage. Boost converters can reach high voltages pretty easily. That's why you can get USB powered nixie clocks, for example.

[QuinnyPig]

You can shock the hell out of yourself with the capacitors for the flash in a disposable camera, so the AAA battery source isn't exactly exculpatory...