|
Detector |
Halogen-quenched, long thin cylindrical Geiger-Mueller tube (LND712)
with side wall of .012" #446 stainless steel, and with thin mica
end window |
|
Window Size |
1.5 to 2.0 mg/cm²
thick; |
| Radiation Detected |
Alpha, Beta,
Gamma, X-ray |
| Sensitivity |
Detects alpha down to 2.5 MeV; efficiency at 3.6 MeV > 80% |
| |
Detects beta at 50 keV w/35% efficiency, at 150 keV w/75% |
| |
Detects gamma and X rays down to 10 keV thru window, 40 keV minimum
through case; gamma sensitivity is 1,000 CPM/mR/hr
referenced to Cs-137 |
| |
Normal
background is approximately 10 to 20 CPM |
|
Accuracy |
± 10% typical; ± 15% max. |
|
Operating Ranges |
.001 to 110 mR/hr; .01 to 1,100 µSv/hr; 0 to 350,000 CPM; 0 to 3,500
CPS; Total from 1 to
9,999,000 counts; Timer: up to 40 hours |
| Anti-Saturation |
"Jam" protection allows readout out
to hold at full scale in high radiation fields |
| Indicators |
LED display, red LED count light,
audible beeper for count rate, and audible alert |
| Display |
4-digit liquid crystal display with mode indicators; updates every 3
seconds |
| Count Light |
Red LED flashes with each count |
| Beeper |
Chirps for each count (can be muted) |
| Alert |
User-adjustable alert level to 50 mR/hr & 160,000 CPM, set using three buttons -
default is 100 CPM |
|
Calibration |
At factory to NBS standard Cesium 137 gamma source |
| Temperatur Range |
-10 deg. to +50 deg. C, 14 deg. to
122 deg. F |
|
Power Required |
One 9-volt alkaline battery (included in price of the unit) |
|
Battery Life |
About 2,160 hours at nomal background
radiation; about 625 hours at 1 mR/hr
with beeper off |
|
Weight |
225 grams (8 oz.) including battery |
|
Size |
150 x 80 x 30 mm (5.9 x 3.2 x 1.2 in.) |
| Output Port |
Stereo 3.5 mm jack on side sends
counts to computers, data loggers, other CMOS-compatible devices, and
headphones |
| Input Port |
Mono 2.5 mm jack provides
electronic calibration input |
| Options |
Computer cable and software (See Software) |
| Warranty |
One year limited on instrument, 90
days on Geiger-Mueller tube; includes CE mark |
Country of Make |
USA |
