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ASM-990 Advanced Survey Meter

 Victoreen® ASM-990 advanced radiation survey meter

ASM-990 Advanced Survey Meter

The Victoreen® 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, 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.

Key Features
  • Auto-scaling measurement of rate and dose simultaneously, with the capability to record peak rate
  • Up to [5] different probes can be calibrated with one unit
  • Survey Mode data logging 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
Product Specifications for ASM-990 and ASM-992
Operating modes
• Rate
• Integrate
• Scaler (dual option): “Based On Measurement or “Based On Time
• Timed Peak Hold
• Data Logging
Operating rate ranges (dependent on selected probe)
µR/hr, mR/hr, R/hr, µrem/hr, mrem/hr, rem/hr, µSv/hr, mSv/hr, Sv/hr, CPM, CPS, DPM 99mTc, DPS 131I, Bq 125I, kBq 123I, MBq 201Tl, µCi 67Ga, mCi 18F, Ci 57Co

µR, mR, R, µrem, mrem, rem, µSv, mSv, Sv, C (counts), kC, MC, D (distintigrations), kD 99mTc, MC 131I

Complementary units in the integrade mode with the integrated time value in seconds
Within 10% of reading between 10% to 100% of full scale indication on any range, exclusive of typical energy dependence. Accuracy is probe dependent
Accepts GM detectors and scintillation probes operating at high voltages between 500 and 1300 volts
Temperature range 14° to 122°F (- 10° to + 50°C)
Relative humidity 0 to 95%, non-condensing
Warm up time
5 second diagnostic check
Check source*
Natural uranium, mounted on the case
* Due to recent international airline shipping policies/restrictions, radioactive “Check Source will not be shipped with the main unit outside the US
Power requirements
Two “D cells, 150 hours operation, automatically indicates when battery is low
Housing material
Proprietary polycarbonate, splash-proof case
Liquid crystal display, 2.2 x 2.2 in (5.6 x 5.6 cm)
Data logging modes
The ASM-990 series’ Log Data feature can easily be accessed via the Setup Sub-menu The unit can log/save a maximum of 500 data points in any of three separate modes (Manual and Survey modes can utilize the optional barcode scanner)
Manual Individual rate data points can be saved by pressing the Start/Stop/Rst/Save button
Timed A data point will automatically be saved at user selectable time intervals in the range of 1 to 255 seconds
Survey Programmed sequences can be accessed via the menu system. Pressing the Start/ Stop/Rst/Save button saves the current reading and displays the next survey location Programming of survey sequences, as well as retrieval of logged data, is accomplished via the built-in IrDA port Label names up to 20 characters can be programmed into the unit to identify the individual survey locations
Weight (without probe)
ASM 990, 992: 2.1 lb(0.95 kg)
ASM 993: 2.4 lb (1.09 kg)
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


Product Specifications for ASM-992 and ASM-993 internal energy compensated 1 R/hr GM detector
0.1 mR/hr to 1 R/hr
Radiation detected
Gamma above 60 keV
± 10% of reading between 10% and 100% of full scale on any range, exclusive of energy dependence


Product Specifications for ASM-993 internal pancake detector
Radiation detected
Alpha above 3.5 MeV, beta above 35 keV and gamma above 6 keV
Background to 80 mR/hr
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
± 10% of reading between 10% and 100% of full scale on any range, exclusive of energy dependence (protective cover open)
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
Model NameDescription
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.

Carrying Cases
990CCCarrying Case (part# 990CC)

Service Packages
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