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Summary of Contents for Sper scientific 840007
- Page 1 RADIATION MONITORS 840007, 840026 INSTRUCTION MANUAL SPER SCIENTIFIC...
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Page 2: Table Of Contents
(do not place in an oven or microwave). DO NOT open the unit (except for battery replacement). There are no adjustments inside for the 840007 that can be made by the user, since the unit is calibrated at the factory. -
Page 3: Battery Replacement
BATTERY REPLACEMENT The unit is powered by a 9-volt battery. With the on button activated, the LED should be brightly lit. When the LED is no longer bright or when the LED dims in the presence of a radiation source, replace battery. To replace the battery: 1. - Page 4 sonable average time should be at least two minutes or more. The Geiger-Mueller tube is located behind the slots in the upper edge of the case. The surface of the tube is very thin (0.004"). This allows beta radiation to penetrate and to be detected with greater efficiency.
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Page 5: Readings
This calibration should be done at a li- censed laboratory. In addition to the analog meter, a special extended range has been designed into the 840007 unit. At radiation levels that are in excess of the meter scale, the unit will emit... -
Page 6: Interpreting Readings
beeps, at a rate that increases as the radiation level in- creases. Although this range is not as accurate as the dis- played range, beeping will begin approximately at 15mR/hr. A continuous beep occurs approximately at 20mR/hr. These built-in ranges greatly simplify operation and allow reasonably quick and accurate measurements to be made. - Page 7 Counters cannot determine the energy of the impinging ray, they only detect its presence. Sper Scientific models 840007 and 840026, detect Beta and gamma radiation starting at approximately 30KeV and up to 1.5 MeV. The opposite is the case for cosmic rays, which have enor- mous energy —...
- Page 8 Atoms are composed of three basic particles: protons, neu- trons and electrons. Electrons are extremely light, nega- tively charged particles that exist as a cloud around the center, or nucleus, of the atom. Sometimes the electrons are said to occupy orbits around the nucleus. These elec- trons are attracted to the nucleus because of the positively charged protons that, along with the neutrons, make up the nucleus.
- Page 9 The energy released in each decay can be enormous. This decay process is utilized in atomic reactors and bombs. When certain very heavy isotopes of uranium or plutonium (or several other isotopes) decay, they may split apart. This process is called fission. In fission, the entire nucleus splits apart, causing two new atoms and releasing a very large amount of energy.
- Page 10 given off from natural radioactive minerals in the earth's crust is a major constituent of background radiation. For the most part, it is quite low, due to the long time required for the remaining radioisotopes to decay. In atomic reactions (either natural or forced by man) the decay process is sped up by the effect of neutrons given off in the fission process interacting with more unstable isotopes to cause immediate...
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Page 11: Specifications
SPECIFICATIONS Min/Max Calibration Typical Detection model Radiation Range Accuracy Energy 840007 Gamma* 0~10 mR/hr +20% 30 KeV ~ 1.5 MeV 840026 Gamma* 0~100 mR/hr +15% 30KeV ~ 1.SMeV *(Cesium 137) 1mR/hr=10µS/hr... -
Page 12: Limited Warranty
LIMITED WARRANTY The 840007 and 840026 Geiger counters are warranted for 5 years on electronics and 1 year for G-M tube from the date of purchase. If a unit fails to function properly within the warranty period, Sper Scientific will repair or replace the unit, at its option.
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