Hi,
I think the machine of above is not, formerly speaking, an LRL. Sure the topic is relevant to remote sensing... but that kind of machines are not LRL as intented here, I mean for treasure hunting.
Why ? Simple, the machine rely on a statistical principle that if
enough mass of target of interest, e.g. gold in treasure hunters case, is buried/dispersed under ground it will have enough interaction with e.g. natural in-ground radioactive sources (e.g. radon gas and similar stuff) and elements in a way you can detect with scintillator etc etc the faint decaying signal of gamma-emission from unstable gold isotopes , counting that emissions etc in the time unit (over e.g. a minute or similar stuff).
What is stupid and also presumptuous is assuming this kind of stuff could be used to find a buried treasure !
This is geo-survey stuff... and people using that stuff play with (often) hundred of tousands tons of stuff (think e.g. at oil reservoir) and radioactive behaviour due to that enormous presence of stuff under soil... not some gold chain or platinum ring!
So, unless you know there's the Moctezuma's treasure of many tons of gold buried under say 10cm soil you will do nothing even owning one of these pearls.
I'm not discussing it could work on-board on a satellite or similar e.g. on an exploring well drill head.... but LRL for THs is not that thing guys! Wake up and forget about unprobable LRL dreams !
That's why I think people playing with LRL like some folks I don't wanna direct call (but I'm sure you understand who I mean) still continue selling snake oil here and CRAP to the
FOOLS!
It's very nice for pseudo-scientists or pseudo-nothing building theories upon existing, working techologies with direct assumption that same technologies and some other exotic stuff (like the pendulum crap) will work joint forces to make you find the buried pile! 
Kind regards,
Max