Features
The ASM-990 series can detect alpha, beta, gamma, or x-ray radiation within an operating range of 1 µR/hr to 1 R/hr (1 to 5,000,000 CPM), depending on the selected probe (Geiger-Mueller, neutron, proportional counter, scintillation). With the proper probe combination, this meter can be used as a general survey meter, an area monitor, a wipe test counter, and a contamination monitor.
Designed to meet the high technology requirements of health physics, medical physics, and nondestructive testing applications, the ASM-990 series is well-suited for a wide range of end users, including: Radiation safety officers (RSO), nuclear medicine laboratories, diagnostic x-ray and hospital emergency room technicians, environmental health physicists, and emergency responders. The units, with purchased probe, are shipped calibrated, ready-to-use, and include a MHV connector to ensure compatibility with all Fluke Biomedical probes. The 992 includes a fully calibrated internal energy compensated 1 R/hr GM detector. The 993 features a fully calibrated internal pancake detector as well as an internal energy compensated 1 R/hr GM detector.
Features:
- Auto-scaling measurement of rate and dose simultaneously, with the capability to record peak rate
- Up to five different probes can be calibrated with one unit
- Data logging survey mode feature allows user to store up to 5 separate survey sequences
- Saved data can be uploaded to a PC via included Infrared Data (IrDA) transmitter
- Easy-to-use multifunction keypad for intuitive menu navigation
- Backlit analog/digital LCD display with full-range audio output capability
- Barcode scanner (optional)
- Auto Power-Down feature extends battery life
Specifications
ASM-990 and ASM-992
Operating modes
- Rate
- Integrate
- Scaler (dual option): “Based On Measurement” or “Based On Time”
- Timed Peak Hold
- Data Logging
Accuracy
Within 10 % of reading between 10 % to 100 % of full scale indication on any range, exclusive of typical energy dependence. Accuracy is probe dependent.
Detector
Accepts GM detectors and scintillation probes operating at high voltages between 500 and 1300 volts
Temperature range
*10 °C to +50 °C (14 °F to 122 °F)
Relative humidity
0 to 95 %, non-condensing
Warm up time
5 second diagnostic check
Power requirements
Two “D” cells, 150 hours operation, automatically indicates when battery is low
Housing material
Proprietary polycarbonate, splash-proof case
Display
Liquid crystal display, 5.6 cm x 5.6 cm (2.2 in x 2.2 in)
Weight (without probe)
ASM 990, 992: 2.1 lb (0.95 kg)
ASM 993: 2.4 lb (1.09 kg)
Dimensions 4.125 (w) x 10.91 (d) x 2.5 in (h) (10.47 x 27.71 x 6.35 cm)
Probe connector
The unit is available with a MHV connector The unit can be used with multiple probes (5 total) by selecting the appropriate probe from the main menu. All calibration data for each probe is stored in the unit’s EEPROM
ASM-992 and ASM-993
Range
0.1 mR/hr to 1 R/hr
Radiation detected
Gamma above 60 keV
Accuracy
± 10 % of reading between 10 % and 100 % of full scale on any range, exclusive of energy dependence
ASM-993
Radiation detected
Alpha above 3.5 MeV, beta above 35 keV and gamma above 6 keV
Range
Background to 80 mR/hr
Window
15 cm2 (1.75 in Ø) mica, 1.4 to 2.0 mg/cm2
Typical background
30 CPM
Protective screen
Stainless steel, hexagonal pattern providing 86% open area
Accuracy
± 10% of reading between 10% and 100% of full scale on any range, exclusive of energy dependence (protective cover open)
Efficiency
The internal pancake detector efficiency is shown below. In a recent performance check, the numbers shown represent typical results obtained:
14C 5%
99Tc 12%
137Cs 24%
90Sr 59%
36Cl 26%
241Am 8%
129I 2%
230Th 15%
239Pu 12%
NOTE: The efficiency formula used to calculate the % Efficiency is: Eff.%=(CPM x 100) /DPM
Product Number: ASM-990 Series
Options
990-IR-USB USB Port IrDA Adapter
990CC Carrying Case
990WM Wall Mounting Bracket
990PH Probe Holder for 489-110D
990UPH Universal Probe Holder
990SH Soft-Sided Holster
990SA Shoulder Strap Assembly
Note: The shoulder strap assembly is only available for the ASM-993 and must be ordered with the instrument and factory installed.
Note: The ASM-990 series, with the customer selected probe is calibrated to NIST standards. The ASM-990 series with GM probe standard calibration is in R, Sv, and rems. Scintillation detectors are calibrated in counts. Radionuclide specific efficiency calibrations are available upon request.
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