Mst-17 / Mct-17 Geiger Mller Counter Tube W/ Mica Window Nos & Tested

US $37.00

Stevens Point, Wisconsin, United States
Jul 2nd

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MST-17 / MCT-17 Geiger-Mller Counter Tube w/ mica window and removable cap. NOS & Tested. Sensitive to alpha, beta (>0.16 MeV), and gamma radiation. The data and certification sheet is in Russian. To the best of my knowledge, the following are the tube's specs: Voltage of start of counting: < 1600V Operating voltage (recommended): 1620 – 1740V Length of flat part of counting curve (plateau): 150 V Slope of the counting curve: < 0.05% Own background: < 0.41 counts/s Maximum radiation: 10,000 counts/min Load resistance: 7-10 MegOhm Allowable stray input capacitance: < 10 pF Working temperature range: -30…+50 C Anode material: Platinum Mica window thickness: < 5 mg/cm2 Weight: ~20g Dimensions: counter length 100mm, diameter 40mm Mica window diameter: 20 mm. I tested the tube near the middle of the recommended operation voltage range (1,700V) with a Nucleus Model 500 Nuclear Scaler (not included in this auction). As the pictures show, the background radiation, measured over a 10-minute period, amounted to about 180 impulses (or 18 impulses/minute) here in central Wisconsin. Predictable for this measurement, the presence or absence of the metal cap made no significant difference. A uranium-oxide glazed pepper shaker next to the side of the tube resulted in 1,271 impulses/minute. When a small amount of Americium-241, emitting about 1 uC of alpha radiation with particle energies of about 5.4 MeV, was placed about 1 cm away from the uncovered window, the counter registered 1,536 impulses/minute. The count dropped to125 impulses/minute with the cap, which contains a small hole, covering the mica window. (The remaining above-background radiation may be due to the small hole or the beta and gamma emissions In the decay chain.) While the tube is NOS, there are some signs of tarnish on the brassy part (front of tube that frames the window and cap). I polished the outside of the cap with very fine sandpaper to remove the tarnish. I will NOT send this tube via airmail since I'm worried that a non-pressurized cargo environment might cause damage to the mica window. (It happened to a similar type of tube I had purchased in Europe.)

Condition:	New – Open box: An item in excellent, new condition with no functional defects. The item may be missing original packaging and may have been used for testing or demo purposes. The item includes accessories found with the original product and may include a warranty. See the seller's listing for full details and description. ...	Model	MCT-17/MST-17
Radiation Detector Type	Geiger Counter
Country/Region of Manufacture	Russian Federation
MPN	Does Not Apply
Custom Bundle	No
Brand	Unbranded
UPC	Does not apply