Fluke 481: Radiation Detection Meter



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The Fluke 481 Radiation Survey Meter is a portable and practical means for identifying irradiated goods, and for helping remediate contamination and safety issues while minimally impacting operations.
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.

Features Include:
• Detects skin-dose (beta particle) and deep-dose (gamma) and X-ray radiation
• Requires no adjustments; simple two button operation
• Delivers quickly read, correct value through autoranging capability
• Easily visible inside truck trailers and other low-light conditions with automated backlight
• Works reliably indoors or outdoors thanks to sealed case
• 30% more accurate than other available meters
• Delivers more than one week of continuous operation from 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
• Useful for contamination-detection, general radiation area surveys, radiation-level monitoring, and hazardous materials assessment
• Ruggedized Fluke design

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 100% 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/cm²
Beta slide 440 mg/cm²
Automatic Features Auto-zeroing, auto-ranging, and auto-backlight
Power Requirements Two 9 V alkaline, 200 hours operation
Warm-up Time One minute
Battery Life Four+ hours continuous use per battery pack
(assumes 50% brightness of LCD)
Dimensions (W x D x H) 10 x 20 x 15 cm (4 x 8 x 6 in)
Weight 1.11 kg (2.5 lb)
Display LCD Analog/Digital With Backlight
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. Digits are 6.4 mm (0.25 in) high. Low battery and freeze indicators are also provided on the display
Integrate 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
Temperature Range -4°F to 122°F
Relative Humidity 0% to 100% (at 140°F)
Geotropism < 1%

Additional information