A two part system is included in this monitor with charcoal filter holder, second a scintillation counter/scaler. In practice, the pump and filter holder are taken to the area to be tested and air pulled through the filter for a period of at least 3 minutes. (Longer pull times increase the sensitivity but 3 minutes gives the sensitivity of 1 picoCi/liter.) Part two, the scintillator/scaler, recieves the sample and counts the activity. A 3 minute count based on a 3 minute sample achieves 1 pico Ci per liter. A ten minute count based on a ten minute sample achieves a 0.1 pico Ci/liter sensitivity. A waiting period of approximately one hour after taking the sample and before counting is required to maximize the sensitivy. Longer or shorter waiting times (from ten minutes to seven days) will still allow detection and accurate measurement of Radon in air but at lesser sensitivity than above.
1. Collectorn MODEL AS-2
Regulated Air Sampler complete with pump and flow meter and filter/cartridge holder.
Free air turbine pump capacity is 30 CFM, under constant surveillance by flowmeter.
10 cartridges are furnished as standard part of the AS-2.
It should be noted that cartridges may be resused if the count of the cartridge shows zero counts above backround.
2. Scintillation/counter consists of MODEL PRS-5 or cheaper scaler electron package coupled with MODEL STG-4 sheilded sample holder scintillator.
Note: Additional charcoal cartridges are available
SENSITIVITY: 1 pico Ci/literwith 3 minute air collection and 3 min count after 1 hour wait.
DAILY VARIATIONS: Radon concentration vaires dramatically during each day. To measure daily average value, leave pump operating in place for 24 hours, then wait at least one hour and make measurement. Quiet pump will nojt disturb most sleepers in adjacent rooms.
REUSE OF CARTRIDGE: The cartridge will rid itself of Radon in approximately 2 weeks with no action, or can be rid completely of Radon in 1 hour by heating in oven for 1 hour at 250 degrees F.
|Detector:||T-1190 GM Tube|
|Size/Material:||2`` dia. Pancake|
|Window:||Mica 1.5 - 2.0 mg/cm2|
Removal of Alpha Shield allows detection of Alphas.
|Detects Aerosol & Reactive Gases*:||Yes|
|Filter:||Charcoal Filter Paper 2`` dia.|
|Iodine Sensitivity: (30 min)||5 x 10-11 µCi/cc|
|Public Release: (1 x 10-10 µCi/cc) Iodine||1/2 x Public Release|
|*Detects all airborne activity except Noble Gases, H-3,C-14,S-35,Fe-55.|