So... Radiation, huh? Skyfall (the Russian thing that happened). Are you affraid? Good, you shouldn't be. Everything is basically normal. But how're you gonna know everything is fine? With a Geiger Counter, of course.

I've literally made this one in a couple of days, including the 3D printed case. I'm still waiting on a BNC connector 

I tried being all smart and making a high voltage supply, a pulse discriminator, blah blah.... And i've got the files and boards... And one of them even has a place for an Atmega 328. Meh, might do something about that.

But for now, ive made this: '

Small, rechargable and yellow. Same colour as the Gamma Scout, but rechargable and smaller. Oh, and it also works with a number of geiger muller tubes:

Ignore the High Voltage power supply. The big grill thing is an SBT-10A. It's a Russian pancake-style geiger tube, sensitive to both Alpha, Beta and Gamma rays. HUGE Mica Window, very fragile and very sensitive. The background on this thing is 180 Counts per Minute!!!!!

Aaaaand i've made it into a probe...

Aaaand i got 2 of them... 

The big cylinder tube is a SI-20G tube. It's a very good tube as well. Very sensitive to background but not as much to point-sources.  

The glass cylinders are a SI-22BG, SI-21BG and the very insensitive SI-3BG. The SI-3BG barely registers one count per minute at background but it goes to 300 Roentgen per Hour (Open Reactor Core levels).

I've made one into a very pretty probe: Complete with BNC connector. 

As you can see, the probe isn't that much bigger than the BNC itself.

If there's ever a nuclear catastrophe, I'll be dead, but ready :D.

Here it is, next to the scintillation detector