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SPER
SCIENTIFIC

RADIATION MONITORS

840007, 840026

INSTRUCTION MANUAL

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Summary of Contents for 840007

Page 1: ...SPER SCIENTIFIC RADIATION MONITORS 840007 840026 INSTRUCTION MANUAL ...

Page 2: ...Although housed in a high impact case the Geiger Mueller tube that senses radiation is fragile If the unit is dropped the G M tube may break Exposure of the unit above 40 C 100 F may also cause the G M tube to stop functioning The electronic circuitry is sensitive to high hu midity over 90 R H CAUTION DO NOT put the unit in a very hot place such as a car s glove box especially on a summer day DO N...

Page 3: ...humb over the pushbutton see Figures 1 and 2 The LED just above the pushbutton indicates that the unit is on and will give an indication of battery condition When the unit is turned on a faint buzz may be audible in a quiet room This is normal and is caused by the transformer that powers the G M tube In most parts of the world background radiation will cause the speaker to click at random interval...

Page 4: ... X rays can penetrate the plastic case with comparative ease Beta radiation can most efficiently enter the case through the slots Although Beta radiation is easily detected it is difficult to measure accurately Therefore when a radioac tive object is being searched for Beta radiation the open slots in the case should be positioned in such a way that they are exposed to the object see Figure 1 If t...

Page 5: ...rror The error caused by this is usually very little Note that in the case of X rays the unit is very sensitive and subsequently meter readings should be di vided by about 5 The 840026 was calibrated For how often you have to cali brate your unit check with your local NRC However you must calibrate after each repair or change of G M tube Since the 840026 radiation monitor has an oscillator it can ...

Page 6: ... from occupational exposure animal studies and events like Hiroshima and Nagasaki have fairly well established the maximum safe exposure limits for man Whether low level radiation causes cancer and birth defects is still being debated Delayed effect which could take years to develop is difficult to study and therefore there are no well defined lower limits on ionizing radiation Two publications en...

Page 7: ...remely energetic while others are not Geiger 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 some millions of times more energetic than anything found here on earth The...

Page 8: ...e the same in every atom of a par ticular element Atoms of an element with different numbers of neutrons are called isotopes Every atom of a particular element has the same atomic number but different iso topes of a given element have different atomic weights It is the variable number of neutrons in the nucleus of an atom that leads to a process called nuclear decay that causes radiation When an a...

Page 9: ... rays and gamma rays can all be described as quanta the difference being the total energy packed into each bundle In nuclear decay some energy in the unstable nucleus is dissipated to its surroundings in the form of heat and radia tion in the instant that it decays The nucleus may remain in its unstable state for billions of years and then suddenly decay spontaneously The time required for half of...

Page 10: ...rgy is expressed in elec tron Volts or eV The energy of beta and alpha rays is in vested in the particles speed A typical beta particle from Cesium 137 has an energy of about 500 000 eV and a speed that approaches that of light Beta energies can cover a wide range and many radioisotopes are known to emit betas at energies in excess of 10 million eV The penetration range of typical beta particles i...

Page 11: ...s is specialized and beyond the scope of typical Geiger count ers but most possible neutron sources also emit gamma and beta radiation affording detection of the source The highly energetic X ray and gamma rays lose their en ergy as they penetrate matter X rays have an energy of up to about 200 000 eV compared to gamma radiation which can be as energetic as several million eV One million eV gamma ...

Page 12: ...ICE Sper Scientific believes the Geiger Counter to be accurate within reasonable standards of acceptance and includes instructions that if followed will yield accurate measure ments Manufacturer assumes no liability for damages consequential or otherwise that may arise from the use of the Geiger counter by any person under any circum stances This Geiger counter is sensitive to gamma beta and X ray...

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