Mt Sorpris

Mt. Sopris Instrument Corporation

Mt. Sopris Instrument Corporation was located at 1320 Pearl Street in Boulder, CO in 1955. They were contractors to the U.S.G.S. and A.E.C.

Mt. Sopris Logo 1955

Mt. Sopris Model SC-129-A 1950's

They offered the Model 129-P Portable Scintillation Counter. It had a 1.5” x 1” hermetically sealed sodium iodide crystal with magnesium oxide reflector. It had a Mu-Metal Magnetic Shield to eliminate errors due to the earth's magnetic field. The case was specially molded of seamless, unbreakable Boltaron. It had rugged, waterproof construction with an unbreakable case and weighed 7 lbs. It was hundreds of times more sensitive then a Geiger Counter. It had six ranges of 0.025, 0.05, 0.25, 0.5, 2.5 and 5 mR/h and two time constants of 1 and 10 seconds. It used two 67.5 volt, two 22.5 volt and three 1.5 volt batteries. The dimensions were 5" x 9" x 5.75". The company also manufactures aerial and carborne scintillators. The unit sold for $647.

Mt. Sopris Model SC-129-P 1955

Mt Sopris Model SC-129 1955

Mt. Sopris Model SC-129-P Ad 1955

Mt. Sopris Model SC-129P 1955

Mt. Sopris Model SC129P

The Model SC-130-GP was introduced in 1955 as a scintillation-Geiger counter. It had an external alarm meter for carborne surveys. The scintillation counter is for exploring on foot and the Geiger probe for spot probing. With one compact package you can conduct general exploration from a car or on foot, make grid surveys, probe shallow holes by hand and deeper ones with a portable reel and recorder, make spot surveys on the surface on in a mine with the hand probe, and add a beta tube for a versatile geophysical exploration or assay tool. It has a humidity proof, crystal hermetically sealed and guaranteed. It had a magnesium oxide reflector for high efficiency. It used Mu-metal magnetic shielding and had a rugged case made of Boltaron which could be washed. The Geiger Counter had a small, sealed, plug-in univibrator that permits direct reading through an independent calibration. The compact alarm meter is ideal for carborne work and hole probing. The meter connect to the unit and requires no additional power. The hole probe is ruggedly mounted and is a Type S Geiger tube from N. Wood Laboratory. The probe is 7/8 inch diameter and ideal for test holes and has a 2 lb brass slug so it will not float in water in the hole. The casing is aluminum providing minimum attenuation of gamma rays. Each probe is pressure tested up to 1000 psi. It has six ranges of 0.025, 0.05, 0.25, 2.5 and 5 mR/h and two time constants of 1 and 5 seconds. It used two 67.5 volt, two 22.5 volt and three 1.5 volt batteries. Total weigth is 7-1/4 lbs and dimensions of 9-3/4 in x 5-1/8 in x 7-3/4 in.

The hole probe length is 32 in and diameter 7/8 in. The weight with slug is 2-3/4 lbs. It comes with four and fifty foot cables. The external meter is 4-15/16 in x 5-3/8 in x 3-3/4 in and weighed 2 lbs. It came with 10 feet of cable.

Mt. Sopris Model SC-130-GP Ad 1955

Mt. Sopris Model SC-130 1955

The Model SC-132 is a Geiger counter. It has attachment ports for audible and external calibration. It has two switches, meter scale multiplier and off/bat. The top of the unit is machined aluminum. The unit is calibrated in cps.

Mt. Sopris Model SC-132

Mt. Sopris Model SC-132 1950's

Mt. Sopris Model SC130GP 1955

The Model DP-165 Scintillation Counter Gamma Hole Logging Probe and Ratemeter is used for detection of uranium, stratigraphy, lithography and in-hole spectrometry. Sensitivity can be adjusted for use with the stratigraphy to radiometric ore assay. The sodium iodide detector is hermetically sealed with magnesium oxide reflector. The probe sensitivity is 8 cps/microR/h. The detector is a Harshaw 1-1/8 in x 1-1/5 in NaI (Tl). Overall probe length is 47 inches with a 2 in diameter and weighs 20 lbs. The ratemeter ranges are 100, 200, 500, 1000, 2000, 5000, 10000 and 20000 counts per second. Time constants are 0.2, 0.5, 1.0 and 5.0 seconds.

Mt. Sopris Model DP-165 1955

Mt. Sopris Model SC-188 DA Airborne 1955