CALIBRATION: MEASURED URANIUM ROCKS VARIETY 6 LBS. .00 + .75 s/h

Description

.00 plus .75 shipping
CALIBRATION:
MEASURED
URANIUM
VARIETY
ROCK SET
This is a specially measured
uranium rock assortment, to enable
you to do this accuracy-adjustment
yourself, without fancy equipment,
on your own geiger counter!
OVERVIEW OF GEIGER
COUNTER CALIBRATION
Calibration is a measurement and adjustment
procedure to check and restore the accuracy
of the geiger instrument when found rocks
are measured. In most instances, calibration
is repeated every one to three years. Usually,
your instrument is shipped away for adjustment
which uses fancy instruments. I have two such
instruments: a Ludlum 500 calibrator and an Eberline
MP-2 geiger calibrator (photos 3, 12). These fine
instruments
generate precisely timed pulses, which
are fed into the probe socket; then the technician
makes adjustments on the geiger to improve its
accuracy. When calibration is done commercially
the user pays a calibration
fee, plus shipping
expenses in both directions. However, with this
special
uranium rock set, calibration costs
can be minimized or avoided!
ROCK ACTIVITY PROPORTIONS
The proportions in the activity level groups
are based on rock weight, NOT on numbers
of rocks. These are the proportions:
15% upper-level  40000 to 55000 cpm
70%  mid-level   6000 to 39000 cpm
15%  low level   2000 to 5000 cpm
UNPACKING THE URANIUM ROCK
SET WHEN IT ARRIVES
On arrival, read the two-side enclosed sheet
on health safety recommendations for handling uranium
(photos 4, 5).
The front side has my own health safety
advice;
the other side
is by a Ph.D. geologist who
authored
a book on radioactive minerals.
Remove and
discard the metal foil that encloses each uranium
rock, then transfer each rock to a zip-lock clear
poly bag. Label the poly bag with the CPM activity
level of its enclosed rock.  The collection of rocks,
all with different CPM activity labels, should be
stored in the supplied metallic bag. When not being
used, store your collection of assorted uranium rocks
in the metallic shield bag on a high shelf. This way,
the rocks will be beyond reach of children or pets and
you will always be aware of where the rocks are kept.
MEASUREMENTS ON ENCLOSED
ROCKS ARE HIGHLY ACCURATE
After the uranium rocks were collected from
their field, they were taken to my home where
activity levels were measured using a pancake probe
and a Ludlum 2200 geiger/scaler (photos 9, 10),
which is the most accurate geiger instrument
that is widely available on Ebay. For each
rock, the surface location with the most
active response is designated with a round
1/4" dot of white typing correction fluid.
The user will identify this most active spot,
then adjust the multiplier-potentiometer
("adjuster") to show the same number as
that written on the rock's enclosure.
Locations of the adjusters are shown
for Johnson, Bicron, and Ludlum geigers
in these photos: 6, 7, and 8. Do the
adjustments when the pancake probe is
positioned on the rock's most active spot.
WHEN MEASURING A ROCK, CHOOSE
A
MULTIPLIER-SCALE THAT PUTS
THE METER'S
NEEDLE NEAR
MIDWAY
ON THE SCALE
Every geiger counter has three or four
"multiplier-scales" such as  x1  x10 x100 or
x1000.
To measure a rock most accurately,
select the multiplier-scale that places the
meter's needle close to halfway.
Errors are
most likely to occur when the meter needle
goes to either extreme (low end or high end)
of the meter's analog scale. Digital measure-
ment, on a geiger scaler such as Ludlum 1000
or Ludlum 2200, avoids "extreme" meter errors.
To adjust the geiger counter's calibration,
a pancake probe is required
. Pancakes are
especially sensitive to radiation: an "end-
window probe" is approximately 30% as
sensitive as a pancake, and a side-window
probe is about 15% as sensitive as a pan-
cake probe. Pancake probes of different
brands are very similar in their measurements,
because most of them have a 2" diameter
sensor, and most pancake probes' sensors
are identical, # 7311, made by LND Co. at
Oceanside NY.  I visited LND Co. in June 2016.
.00 plus .75 shipping
THE CANYON IS AN IMPRESSIVE REMOTE SITE
These rocks were found at or near the ground surface at the Jurassic Canyon
uranium field,
located 20 miles N.W. of Grants NM. The canyon is situated
just 14 miles north of I-40 freeway exit # 79 at Milan NM, on paved state
highway # 605, yet it is unmarked.  The rocks are a variety of geological
types: Jurassic
todilto
limestone, tyuyaminite, uraninite (pitchblende), carnotite,
or coffinite.  All federal
regulations
that pertain to uranium rocks are fully
obeyed. Jurassic Canyon is part of the famed
Morrison
Formation,
the richest
surface-level uranium source in the entire USA.  The uranium
rocks
were formed
nearly entirely during the Jurassic geological era, 200 million to 146 million years
ago. This
site is the world center for uranium-in-limestone.  Dinosaur skeletal
fossils
are found occasionally in the larger uranium rocks. Recently, I found a
fossilized
head of a juvenile
velociraptor
dinosaur in a uranium rock (Jurassic
todilto
limestone),
with a 180,000 cpm level. The
Uranium Mining Museum
in Grants
NM has an
impressive display of dinosaurs living among uranium,
near the
then-active
Mount Taylor volcano. The uranium canyon near Grants
was well described in these two books:  (1)  Michael A. Amundson:
Yellowcake
Towns: Uranium Mining Communities in the American West.
Boulder CO:
University Press of Colorado, 2002. Ch. 5: Uranium Capital of the World:
Grants. pp. 77-104.  (2)  Roger D. Saunders:
Underground and Radioactive:
Adventures of a Uranium Miner in 1970s New Mexico.
McFarland Publishers:
Jefferson NC, 2017, 210pp.
BONUS 40-MINUTE DVD VIDEO,
NOT FOUND ON YOUTUBE!
Enclosed with the uranium rock will be
my original DVD video disk
dated March
2017 and July 2019. This
40-minute
video provides a narrated video tour of the
NM locale where many rocks can be found
through prospecting. This exclusive DVD
video program is
enclosed at no extra cost.
(This
video
is
NOT
to be uploaded to YouTube.)
ACTIVITY LEVELS OF THE ROCKS
These rocks were measured with a pancake probe on a
Ludlum 2200
ratemeter / scaler, the most accurate
geiger instrument available.
The terms LOW / MIDDLE /
HIGH
activity are by comparison only
with other natural
uranium rocks; these terms
DO NOT
compare any of the
rocks with medical, industrial, or military applications.
ALL FEDERAL AND POSTAL
REGULATIONS
ARE FOLLOWED
These regulations allow rock collectors to
own and to mail natural uranium rocks. The
federal Bureau of Land Management (BLM)
owns uranium fields and allows hobbyist "rock
hounds"
to gather rocks at those fields. The
rocks must be properly labeled, and must be
double-boxed when mailed.  The federal Nuclear
Regulatory Commission (NRC) does not allow any
manufacturing
from the rocks without an advance
NRC
license.
The rock parcels can be mailed
to
addresses
within the
USA but are
NOT allowed
to be exported
to any foreign country.
SHIPPING COST: ONLY
THE ACTUAL USPS POSTAGE
Many sellers conceal the actual postage cost;
I have boldly instructed the mailing software to
display
on the shipping label the actual postage
amount spent.
If the actual postage cost is
{{detail_product_description}}.20
or more below what you paid, I will fully
refund
the amount overpaid, back to your Ebay account,
as soon as the package is mailed.
SHIPPING NOTES
I do combined shipping, so look at my
other
ads, also. If you order two or
more items,
pay the postage as stated
in the ad. Then,
when the parcel is
mailed,
I will refund
any overpayment
on postage above
the actual cost of
postage. The
parcel will be wrapped and
shipped in
accordance with all regulations.
The following postal statement
will be included in the package:
NATURAL UNPROCESSED ORE
This package conforms to the standards of the
Nuclear Regulatory Commission's rules 40.13
and 40.22, as well as USPS Packaging Instruc-
tion 7A
and USPS Publication 52, Section 347.22
Price:  .00 plus .75 shipping
HHHHHHHHHHHHHHHHHHHHH
Stephen Buggie, Ph.D.
Psychology Professor Emeritus
Univ. of New Mexico, Gallup