26
Appendix A
Technical Specifications
Sensor:
Halogen-quenched Geiger-Mueller tube
with mica end window (LND 712 or
equivalent). Mica window density 1.5-
2.0 mg/cm
2
. Side wall is .012” #446
stainless steel.
Display:
4-digit liquid crystal display with mode
indicators
Operating Range:
mR/hr:
.001 to 110
CPM:
0 to 350,000
Total:
1 to 9,999,000 counts
µ
Sv/hr:
.01 to 1100
CPS:
1 to 3,500
Energy Sensitivity:
1000 CPM/mR/hr referenced to Cs-137
Accuracy:
±
10% typical,
±
15% max. (mR/hr and
µ
Sv/hr modes)
Alert Range:
mR/hr:
0 to 50
CPM:
0 to 160,000
Beeper sounds the alert.
Count light:
Red LED flashes with each count
Beeper:
Chirps for each count (operational in
audio mode only – can be muted)
Ports:
Dual miniature jack sends counts to
CMOS-compatible devices, including
computers, data loggers, earphones, and
educational data collection systems.
Submini jack provides calibration input.
Output:
Dual 3.5 mm jack provides output pulse
for each count for interface to computers,
data loggers, earphones, and educational