The product is by Golden Engineering, called Inspector 200.Andrew Seltzman wrote: ↑Sun Apr 26, 2020 7:33 pm150kVp, 50ns pulses. 2.5mR/pulse at 12"
These are cold cathode tubes, unfortunately they use a positive pulse so they can't be used to drive a pulsed fusor.
Seller will take $120 best offers, possibly lower.
The one I got works fine, it can run off of 24-29Vdc by connecting to the battery terminals.
https://www.ebay.com/itm/Golden-Enginee ... 2749.l2649
A week later, Alan Sailer replied that he bought one to mess with.
There was some back and forth about detection, concluding that GM tubes (and pretty much any other detector-counter system) will report any 50 ns pulse of x-rays as one count.
Dosimeters and other detectors based on an ionization chamber, with no charge multiplication in the medium, work.
As would a fluorescent screen or scintillator followed by measurement of total light output (e.g. eyes or camera).
May 14:Rich Feldman wrote: ↑Wed May 06, 2020 5:06 amThank you for the tip, Andrew. I just ordered a unit myself, perhaps the penultimate specimen in that lot.
Got anxious about competition and offered $160, which was accepted.
In previous post I mentioned a billion photons per cm^2, as a SWAG value.
Ran the numbers properly today and got values between 10 to 100 million, depending on the x-ray spectrum. .
The least potent photons, for exposure (roentgens) or air kerma (grays), are at about 60 keV.
Those with more energy naturally pack more of a punch.
Those with less energy lose it in a much smaller mass of air.
Online literature generally agrees that at 0.060 MeV, it takes about 30 billion photons/cm^2 to get 1 roentgen, and 14% more to get 1 rad = 1 centigray.
For chart above, mass energy-absorption coefficients, μen/ρ, come from
https://physics.nist.gov/PhysRefData/Xr ... b/air.html
Conversion to kerma K and exposure X follows references like
https://www.utoledo.edu/med/depts/radth ... andout.pdf
Break time.Rich Feldman wrote: ↑Thu May 14, 2020 7:09 pmMy "The Inspector" arrived on May 13. Time to figure out how to connect power, turn it on, make it go, etc. It was surprising that the field-emission x-ray tube has a "film" window, visibly concave on the air side.
Why not something more substantial, like the beryllium in this stock picture of a tube by L-3, used in Fexitrons and Febetrons?
 found and downloaded a manual more complete (?) than the one in Andrew's OP. ...
For later: shortened story of my unit having been mis-assembled by some previous custodian, but working (with x-ray detection 3 ways) after fixing the obvious thing.
And the follow-up on June 1 about commercial Marx banks, which Alan Sailer suggested privately as possible implementation of step-up to 150 kVp in the portable devices we are talking about.
If voltage multiplication is by Marx, it might be not too hard to get -150 kV out of same module, e.g. for a pulsed fusor.
Hey AS #1, are you set up to get a radiograph of the multiplier section?