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| Geiger Counter Hand held battery powered Geiger counter for the measurement of gamma, X-ray and beta radiation. Radiation is becoming more of an issue in modern life. There are many sources of natural and man-made radiation sources. For example, intentional and accidental emission from nuclear power stations, hospitals, even dentists. There are also natural sources of radiation from geology, accumulation in animals, fruit and vegetables. The Dryden Aqua Geiger counter provides you with a means of measuring radiation levels. The information provides you with the opportunity to take remedial action, or re-assurance that your environment is safe. |
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| Safe Levels ? interpretation of
results There is a great deal known about the effects of radiation of man and animals, however it is very complex and and the theories and conclusions are constantly being up-dated as new information becomes available. The levels responsible for delayed results of low level exposure are not known, there are therefore no well defined low level limits for ionising radiation. The safe approach it therefore to err on the side of caution. The Geiger Counter will give a click every 1 or 2 seconds as a normal background level, 0.1mR/hr will give 5 clicks a second, an old 1930`s radium dial watch will give 3 mR./hr. It is completely arbitrary, but we would advise caution with sustained levels above back-ground levels of 1 to 2 licks per second.over a period of around 10 minutes. Occasionally you may get a high reading for a few seconds, this happens when two or more particles coincide, this is quite normal. We were involved in assisting with clean up of radiation fall out in the UK after Chernobyl, we have a product called ammosorb that will absorb caesium and strontium radioactive nucleotides. We therefore know that there are radiation hot spots and that many produce such as rhubarb will actually bioaccumulate radiation. It is easy to become paranoid, but common sense is always a good route to follow. There is no need to measure everything that you come in contact with or eat. However if you live or work in an area that is suspect, e.g. with 50 km of a nuclear power station, then our simple Geiger Counter could be a good investment for your safety.
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| Technical details | parameter | Technical details | parameter |
| Radiation | gamma & beta | typical accuracy | +/-20% |
| dual scale (logarithmetic) | 0 - 100uSv/hr, 0-10mR/hr | calibrated for gamma | in compliance with NCR |
| audible scale | continuous at 10mR | Gm tube thickness | 3mm |
| audible scale at 0.1mR/hr | 330 clicks per minute | Temperature | -10 to + 40 deg C |
| power supply | 9v pp3 | Humidity range | must be less than 90% |
Note.
The unit is housed in a tough plastic case, however the Gm tube is fragile and if it is dropped the internal tube may be get damaged.
Measurement of absorbed doses and biological damage:
The IS unit for the amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays, equivalent to a gray for x-rays.It measures the radioactive dose equivalent. One sievert is equal to one gray multiplied by a relative biological effective factor, Q, and a factor that takes into account the distribution of the radiation energy, N.
The sievert is the correct unit to use when you wish to monitor the biological danger of radiation.
The IS unit for the energy absorbed from ionizing radiation, equal to one joule per kilogram. An absorbed dose of one gray is equal to the absorption of one joule of radiation energy by one kilogram of matter.
The gray is the correct unit to use when you wish to monitor energy absorbed per unit mass.
Measurement of radiactivity:
Quantity of any radionuclide in which the number of disintegrations per second is 3.7 x 1010 .
1 Ci = 3.7 x 1010 disintegrations per second (dps)
The International System unit of radioactivity, equal to one disintegration per second.
1 Ci = 3.7 x 1010 Bq
1 Bq = 2.7 x 10-11 Ci
Radiation Measurement Units
- International (SI) System
| The curie (Ci) is replaced by the
becquerel (Bq)* 1 kilocurie (kCi) = 37 terabecquerel (TBq) 1 curie (Ci) = 37 gigabecquerel (GBq) 1 millicurie (mCi) = 37 megabecquerel (MBq) 1 microcurie (µCi) = 37 kilobecquerel (kBq) 1 nanocurie (nCi) = 37 becquerel (Bq) 1 picocurie (pCi) = 37 millibecquerel (mBq) |
Becquerel (Bq)* replaces the
curie (Ci) |
| The rad (rad) is replaced by the
gray (Gy) 1 kilorad (krad) = 10 gray (Gy) 1 rad (rad) = 10 milligray (mGy) 1 millirad (mrad) = 10 microgray (µGy) 1 microrad (µrad) = 10 nanogray (nGy) |
The gray (Gy) replaces the rad (rad) 1 gray (Gy) =100 rad (rad) 1 milligray (mGy) = 100 millirad (mrad) 1 microgray (µGy) = 100 microrad (µrad) 1 nanogray (nGy) = 100 nanorad (nrad) |
| The roentgen (R) is replaced by
coulomb/kg (C/kg) 1 kiloroentgen (kR) ~ 258 millicoulomb/kg (mC/kg) 1 roentgen (R) ~ 258 microcoulomb/kg (µC/kg) 1 milliroentgen (mR) ~ 258 nanocoulomb/kg (nC/kg) 1 microroentgen (µR) ~ 258 picocoulomb/kg (pC/kg) |
Coulomb/kg (C/kg) replaces the
roentgen (R) 1 coulomb/kg (C/kg) ~ 3876 roentgen (R) 1 millicoulomb/kg (mC/kg) ~ 3876 milliroentgen (mR) 1 microcoulomb/kg (µC/kg) ~ 3876 microroentgen (µR) 1 nanocoulomb/kg (nC/kg) ~ 3876 nanoroentgen (nR) |
| The rem (rem) is replaced by the
sievert (Sv) 1 kilorem (krem) = 10 sievert (Sv) 1 rem (rem) = 10 millisievert (mSv) 1 millirem (mrem) = 10 microsievert (µSv) 1 microrem (µrem) = 10 nanosievert (nSv) |
The sievert (Sv) replaces the rem
(rem) 1 sievert (Sv) = 100 rem (rem) 1 millisievert (mSv) = 100 millirem (mrem) 1 microsievert (µSv) = 100 microrem (µrem) 1 nanosievert (nSv) = 100 nanorem (nrem) |
