The Monitor 200 Radiation Detector features an internal end window detector and digital display. This detector measures alpha, beta, gamma, and x-rays. Choice of units include counts per minute (CPM), CPS, µSv/hr, mR/hr, or scaler / accumulated counts. With USB interface Observer Software included, the user can download accumulated data from the Digilert200’s internal memory, set alarms, and calibrate the instrument.

Specifications:
Detector Halogen-quenched GM tube with thin mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.
Operating Range mR/hr - .001 (1µR) to 200 mR/hr, µSv/hr - .01 to 2000, CPM - 0 to 214,000, CPS - 0 to 3575
Total Counts - 1 to 9,999,000 counts
Accuracy Typically ±15% from factory, ±10% (NIST)
Energy Sensitivity 1070 CPM/mR/hr referenced to Cs137, Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%., Detects beta at 50 keV with typical 35% detection efficiency., Detects beta at 150 keV with typical 75% detection efficiency., Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.
Anti-Saturation Readout will OVERRANGE in radiation fields as high as 100 times the maximum reading.
Selectable Alert Set Range mR/hr .001 - 100 and CPM 1 - 350,000. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. 70db @ 1m. Alarm will sound when in Timer Mode when set alarm threshold is reached.
Energy Response Curve

Energy Response Curve for Monitor 200 Radiation Detector
Display Graphic LCD with Backlight.
Count Light Red LED flashes with each count.
Audio Indicator Sounds with each count (can be switched off for silent operation)
Outputs USB for use with Observer USB Software Family
Power Requirements Two AA alkaline batteries (included)
Size 140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)
Includes Carrying Case, Xtreme Boot, Stand, Mini-USB Cable, Observer USB Software Download , Certificate of Conformance
Options NIST Calibration
Limited Warranty 1 year limited warranty