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  • FLUKE-481



  • Detects skin-dose (beta particle) and deep-dose (gamma) and X-ray radioactivity
  • Requires no adjustments; simple two button process
  • Provides promptly read, correct value through autoranging capability
  • Easily visible inside truck trailers and other low-light situations with automated backlight
  • Works dependably inside or outside thanks to sealed case
  • 30% more precise than other available meters
  • Delivers more than one week of uninterrupted functioning with two 9-volt alkaline batteries
  • Proven in use by state and local governmental emergency response professionals, state inspectors, HAZMAT teams and nuclear power workers
  • Measures both dose and dose-rate
  • Valuable for contamination-detection, general radiation area metering, radiation-level monitoring, and hazardous materials assessment
  • Rugged Fluke design
Interested in a FREE demo? Call 1-800-884-4967 or complete this form to submit your request.


The Fluke 481 Radiation Survey Meter is a portable and practical means for discovering irradiated goods, equipment, surfaces or environments in industrial settings. Use of the device reassures employees that radiation risks are known, monitored and measured for their protection. If radiation is found, a clear and quantifiable result allows managers to comply with federal guidelines, without overreacting with unnecessary steps that might halt operations, impact productivity or lead to lost revenue.

The Fluke 481 Radiation Survey Meter detects beta, gamma and X-ray radioactivity and provides prompt readings of dose and dose-rate. The rugged meter requires no adjustments and utilizes a simple two button interface. The LCD display includes a 100 element bar graph as well as a 2.5 digital readout that displays the measurement at all times. The 481 is accurate to ±10% of full scale indication—nearly 30% better than comparable meters. The 481 includes auto-zeroing, auto-ranging, and auto-backlight functions.

Fluke 481 Radiation Survey Meter
General Specifications
Radiation detected Beta > 100 keV
Gamma > 7 keV
Operating ranges 0 mR/h to 5 mR/h (8 sec)
0 mR/h to 50 mR/h (2.5 sec)
0 mR/h to 500 mR/h (2 sec)
0 R/h to 5 R/h (2 sec)
0 R/h to 50 R/h (2 sec)
Accuracy Within 10% of readings between 10% and 10 % of full scale indication on any range, exclusive of energy response
Detector Chamber (cc volume air ionization) 349 cc
Chamber wall (phenolic) 246 mg/cm2
Chamber window (mylar) 6.6 mg/cm 2
Beta slide 440 mg/cm 2
Automatic features Auto-zeroing, auto-ranging, and auto-backlight
Power requirements Two 9V alkaline batteries
Battery life > Four hours continuous use per battery pack (assumes 50 % brightness of LCD)
Analog 100 element bar graph 6.4 cm long. Bar graph is divided into 5 major segments, each labeled with the appropriate value for the range of the instrument
Digital 2.5 digit display is followed by a significant zero digit depending on the operating range of the instrument. The units of measurement are indicated on the display at all times
Integrated mode Operates continuously 30 seconds after the instrument has been turned on. Integration is performed even if the instrument is displaying in mR/h or R/h
Freeze mode Will place a tick mark on the bar graph display to hold on the peak displayed value. The unit will continue to read and display current radiation values