Fluke 481 Data Sheet

Fluke 481

Radiation Survey Meter

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.

Technical Data

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

Fluke 481 Radiation Survey Meter

Detector

End users •

Radiation detected

Specifications

Radiation detected

Operating ranges,
response time

Accuracy

Detector

Automatic features

Power requirements

Warm-up time

Display LCD
analog/digital
with backlight

Modes

Environmental

Dimensions

(W x D x H)

Weight

Ion chamber

X-ray manufacturers

•

State inspectors

•

Government agencies

•

Police and fire departments

•

Emergency response and hazmat teams

•

Nuclear medicine labs

•

Hospital radiation safety officers

•

Nuclear power workers

beta, x-ray, gamma

Beta > 100 keV

Gamma > 7 keV

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)

Within 10 % of readings between 10 % and 100 % of full scale
indication on any range, exclusive of energy response

Chamber (cc volume air

349 cc

ionization)

Chamber wall (phenolic) 246 mg/cm2

Chamber window (mylar) 6.6 mg/cm2

Beta slide 440 mg/cm2

Auto-zeroing, auto-ranging, and auto-backlight

Two 9 V alkaline, 200 hours operation

One minute

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 %

10 cm x 20 cm x 15 cm (4 in x 8 in x 6 in)

1.11 kg (2.5 lb)

Fluke. Keeping your world
up and running.

Fluke Corporation

PO Box 9090, Everett, WA 98206 U.S.A.

Fluke Europe B.V.

PO Box 1186, 5602 BD
Eindhoven, The Netherlands

For more information call:

In the U.S.A. [phone] or
Fax [phone]
In Europe/M-East/Africa [phone] or
Fax [phone]
In Canada (800)-36-FLUKE or
Fax [phone]
From other countries [phone] or
Fax [phone]
Web access: http://www.fluke.com

©2011 Fluke Corporation.
Specifications subject to change without notice.
Printed in U.S.A. 4/2011 4022637A D-EN

Modification of this document is not permitted
without written permission from Fluke Corporation.

®

2 Fluke Corporation Fluke 481 Radiation Survey Meter