and attached natural uranium test

source. $380.00 plus shipping.

 

Made in USA

Make American manufacturing

great again!

 

 

 

INTRODUCING THE P3

HIGH-PERFORMANCE

PANCAKE PROBE

The "Pikes Peak Prospector" P3 probe

 

The world was amazed during February 2019 when

Elon Musk's SpaceX company launched its "Falcon

Heavy" rocket, which boosted Musk's car into

deep space, then landed the booster rockets on

their fiery tails back at the launch pad.  Now, the

geiger world will be equally amazed at the high

performance offered by the P3 large pancake probe,

developed by geiger inventor George Dowell.

Read on, and you will become convinced that the 

geiger counter is an accessory for the probe,

and not the other way around!

 

 

 

DEFICIENCIES OF THE
STANDARD PANCAKE PROBE

The standard pancake probe (e.g., Ludlum 44-9) is

favored by geiger enthusiasts because of its strong

sensitivity. Its detector/sensor, the LND #7311, is used 

in all prestige brands:  Bicron, Ludlum, Johnson, and

Eberline. The standard pancake is popular because it is

more sensitive than side-window or end-window probes.

But, standard pancakes have weaknesses! First, they are

fragile and are probe to breaking.  The thin mica window

behind the screen is easily punctured by objects that

penetrate the probe's screen: straw, thorns, cactus,

insect stings, etc.  Second, the standard pancake sensor

is altitude-sensitive:  The probe's sensor may burst

if carried to high altitudes above 8,000 ft, or if carried

in unpressurized aircraft.  In June 2017 while prospecting

at Poison Canyon NM (alt: 6500 ft) a standard pancake's

sensor-membrane burst while I used it!  Possibly, this may

have happened because of the borderline high altitude, or

the 100 degree dry heat, or a combination of both. Third,

the standard probe's #7311 sensor is difficult to replace

if damaged. Some users have ruined the expensive #7311

sensor ($120.00, factory-direct) while installing the 

replacement.

 

 

POSITIVE FEATURES OF THE

P3 LARGE PANCAKE PROBE

"a geiger probe on steroids"

The P3 large pancake probe is based on the Russian

sensor SI-8b, which is available now from sellers in

Russia or Ukraine.  It has notable advantages over the

American #7311 sensor.  First, its thin mica membrane

is thicker and more durable than the #7311.  Second, all

these sensors from Russia or Ukraine are new-old-stock,

and have NOT been used previously.  Third, their frontal

surface area is twice as large as with the #7311

American-made sensor, and this improves its sensitivity.

Fourth, the SI-8b is robust (durable) when used at various

elevations.  George Dowell dramatically demonstrated

this "altitude-resilience" by transporting a P3 probe to

the summit of "Pike's Peak," a 14,100 ft mountain at

Colorado Springs CO.  Pike's Peak is the tallest mountain

in the U.S. that has a paved highway to the summit.

Even at this high altitude, the SI-8b was unaffected.

Fifth, George Dowell's housing for the SI-8b detector

includes his original innovation: a circuit board that

adjusts the DC high voltage from the North American

standard of DC 900 volts, to the Russian / European

standard of DC 450 volts. All North American geiger

counters use DC 900 volts, so the step-down circuit

board allows the P3 probe to be used directly with

all U.S./Canadian geiger counter brands, giving

maximum electronic flexibility and versatility.

 

 

SUBTERRANEAN HIGH SENSITIVITY:

DETECTING URANIUM BURIED

BELOW THE GROUND SURFACE

In March 2018, two geiger people from Wisconsin

joined me for prospecting at Poison Canyon, 55 miles

east from my home at Gallup.  We located a remote

area of the canyon we renamed, "the field of buried

boulders."  This field has large rocks weighing five

lbs. or more, that are hidden completely below the

ground surface. The P3 geiger probe has such high

penetrating sensitivity that it can "sniff" the large

radioactive uranium rocks that are buried below the

ground surface at this site. The probe's sensitivity,

described in this ad's headline as "powerful," applies

especially to its ability to detect stimuli at further

distances than is possible with plain ordinary pancakes,

such as the Ludlum 44-9. the Bicron PGM, or the

Eberline HP-260.

 

 

YOUTUBE VIDEO COMPARING

A P3 LARGE PANCAKE TO AN

ORDINARY PANCAKE PROBE

View this 2:21 minute YouTube video

by geiger inventor George Dowell,

to see performance differences

between the P3 probe and an

ordinary pancake probe:

At YouTube, search for the

following video: 

GEO 310 vs. HP260

GEO310 is the P3 large pancake

probe, and HP260 is an Eberline 

ordinary pancake probe, identical

to the Ludlum 44-9 probe.

 

 

 

PROBE-DISTANCE EXPERIMENT:

SHOWING DISTANCE-SUPERIORITY

OF P3 PROBE OVER STANDARD

44-9 PANCAKE PROBE

 

Results of this experiment show that, compared with the

standard 44-9 pancake, the P3 large pancake probe is

superior in responsiveness to radiation, and that this

superiority is especially strong at greater distances.

 

A 6" Fiestaware plate, with 14% uranium in the orange

glaze, was the radiation stimulus. The same geiger

counter, a Ludlum Model 3, was used with each of the two

probes.  Measurements were done at six different distances

between stimulus plate and probe.  Results are shown below:

 

                                       DISTANCE  FROM             STANDARD        P3 LARGE     

                                        PLATE TO PROBE            44-9  PROBE    PANCAKE  PROBE

                                               0"                      40,000 cpm         52,000 cpm

                                               3"                      10,000 cpm         24,000 cpm

                                               6"                       5,000 cpm         13,000 cpm

                                               9"                       3,500 cpm          7,000 cpm

                                              12"                       2,500 cpm          5,000 cpm

                                              15"                       1,500 cpm          3,500 cpm

 

 

 

 

BRIGHT WHITE-COLORED LED LAMP

FLASHES IN SYNCHRONY WITH

CLICKS HEARD ON THE SPEAKER

This is my original innovation, which I install in prestige-

brand geiger counters: Bicron / Ludlum / Johnson. A

white LED lamp is installed on the left side of the

bathtub lower case; it is shown in one of the photos.

The LED lamp is very useful when using the instrument

in a very noisy environment, or if the user has a hearing

disability. The LED is BRIGHT!  If you have an auditory

disability, then this is the geiger instrument for you.

The flashing white LED lamp has no effect on the

operation of the geiger instrument. The LED lamp and

speaker can be turned off with the audio toggle switch.

 

 

 

GEIGER METER: FOUR MULTIPLIER

RANGES GIVE CPM RATINGS

AS HIGH AS 440,000 CPM

Ludlum's Model 3 is a deluxe version, with FOUR

multiplier ranges; most geiger counters have only

three ranges. The highest range, x100, enables

the instrument to evaluate rock samples that

give readings as high as 440,000 cpm.

 

 

CAN YOU CONSTRUCT YOUR OWN P3

LARGE PANCAKE PROBE, FROM PARTS?

Yes, but components will come from two separate

sources.  The metal case with voltage-drop circuitry,

is available from geiger inventor George Dowell,

@ $54.99 plus shipping. His parts are sold on

 with the brand name, GEO-ELECTRONICS.

Search for this item number:

352558866645

 

The SI-8b sensor must be purchased from suppliers in

either Russia or Ukraine. Previously, these sensors

cost only $45.00 each during 2015 or earlier, but

these prices have climbed greatly during recent

years. One seller now sells a lot of ten SI-8b

sensors for $2,999. ($299.90 each!)  The seller

"Any-devices" in Ukraine is trustworthy, having sold

me four lots of these SI-8b sensors, all working.

"Any-devices" now sells each SI-8b sensor for

$89.00 plus shipping costs from Ukraine. I

recommend him highly as a seller of SI-8b.

Search for this item number:

283482309053

 

 BONUS ADAPTER CABLE:

LUDLUM-C SOCKET TO BNC PLUG

Suppose that you already own a geiger probe,

and it has a Ludlum-C "male" plug. No problem! 

I have made a 12" adapter cable so that you can

use a Ludlum-C probe with this geiger counter!  Just

 insert that probe's plug into the "female" C-socket on

this short cable, then insert the cable's gold-plated BNC 

plug into the probe socket of this Ludlum Three. This

original plug-adapter is shown in photo # 6. Of course,

you also have the P3 pancake probe included with the

instrument. With this adapter cable, you can use ALL

North American geiger probes: those with BNC plugs

plugs or those with Ludlum "C" plugs. Total flexibility!

   

 

 

 

 

GEIGER COUNTER WILL

BE FULLY CALIBRATED

Prior to shipping, I will check and adjust the instrument's

calibration. My calibration tools are: (1) Ludlum Model 500

calibrator, (2) Eberline MP-2 pulse generator, (3) Fluke high

voltage DC probe, and (4) Sperry high-level DC voltmeter.