HV adjust control moved from main circuit board to rear panel. Contact paper
added to top cover to reduce glare onto windshield.
The 1" x 1" Gamma scintillator is protected from scratches,
direct sunlight by placing it inside a sturdy cardboard shipping tube. The
tube is also covered with contact paper.
After driving around for a while I've established a base-line background count. The alarm is set
about 1.5 times the local background.
Attaching the unit to the dashboard with Velcro keeps it from sliding around in traffic. At first the tendency
was to watch the meter, BAD IDEA. Forget the meter, let the alarm do the work. It may only alarm a
few times a season, but it WILL catch your attention.
In the mountains I add an altitude meter, nav gear and GPS.
*Here are a few of the fish I've caught with it:*
Rad Waste, near Whiteman AFB in the Kansas City MO area>
For a while after metering this target, our vehicle was boxed in by several black SUV's with dark tinted windows!
UF6 being transported in Kentucky near Paducah>
Another UF6 shipment, this one in Illinois>
These drivers seem to take frequent visits to regular truck stops, so I never had to follow very long to get a
stationary target. In every case, they go inside and leave the truck totally unsupervised!
This year I'm adding a few new sensors to the Mobile Rad Lab.
One is the Home-Made Neutron Detector Probe, built around a Reuter-Stokes
20 atmosphere He-3 tube. The 300 PSI He3 is about 50+ times more sensitive than the Remball shown.
12.7 cps VS .25 cps/nv
Pictures of home made neutron detector using 20 atm He3
proportional neutron detector tube. Tube is 1/2" x 4 " active length, He3 is 300
PSI, moderator is 6.5" X 12.5" HDPE. Compare this to the N. Wood BF3 tube in the
9" Remball @ 1" active length. and .78 ATM or roughly equiv. to LND 20126.
A handle will be fitted when the final arrangement is decided.
A GE/ Reuter-Stokes RS-94-0404-253 and is equiv. to LND 25143, with thermal neutron sensitivity of 12.7 cps/nv.
An N. Wood G-5-1 as used in the Remball is rated at .25 cps/nv making the home made probe some 50 times more sensitive as the Remball and 4 times the active length.
Another is a handheld GAMMA SPECTRUM ANALYZER to grab spectra on the fly from the next target.
Shown are a few from which I can chose
The Exploranium GR-135 is Gamma only>
Quantrad RANGER PLUS does Gamma and Neutrons.>
BUBBLE DETECTORS> One for Gammas, one for Neutrons>
Finally for personal protection, a PM-1703 Pocket Scintillator Alarming Ratementer>
and a Rados-60 Pager sized electronic Dosimeter/Alarming Ratemeter.>