451B-DE-SI Ion Chamber Survey Meter with Beta Slide

451B-DE-SI Ion Chamber Survey Meter with Beta Slide
Ion Chamber Survey Meter with Beta Slide
Technical Data
The 451B state-of-the-art ion chamber survey meter
is a handheld battery operated unit designed for
use in both rugged and normal environments. The
451B-DE-SI is ideally suited for area monitoring to
insure radiation worker safety. The moveable beta
shield permits measurement of Deep-Dose Equivalent
(H*(10)) and Shallow-Dose Equivalent (H*(0.07))
exposure per United States Nuclear Regulatory Commission and International Commission on
Radiation Units & Measurements definitions. The
451B auto-ranges and measures radiation rate and
accumulated dose from various radiation sources
(alpha, beta, x-ray, gamma). The ion chamber detector
allows for a fast response time to radiation from
leakage, scatter beams, and pinholes. Additionally,
the low-noise chamber bias supply provides for fast
background-settling time.
The digital display features an analog bar graph,
2.5 digit readout, low battery indicator, freeze (peak
hold) mode indicator, and an automatic backlight function. User controls consist of an ON/OFF button and a
MODE button. The case is constructed of lightweight,
high strength materials and is sealed against moisture.
The RS-232 interface can be connected directly to
a computer for use with the Excel add-in for Windows
(451EXL), enhancing the functionality of the instrument. This software allows for data retrieval, user
parameter selection and provides a virtual instrument
display with audible (requires sound card) and visual
alarm indication.
Key features
• Measures skin dose (slide open) and deep dose (slide closed)
• High sensitivity measurement of rate and dose simultaneously, with the capability
to record peak rate
• Auto-ranging and auto-zeroing
• RS-232 communications interface with optional Windows-based Excel add-in for
data logging
• Ergonomic, anti-fatigue handle with replaceable grip, wrist strap and tripod mount
• Programmable flashing LCD display
• Easily-accessible battery door (operated by two 9-volt alkaline batteries) on the
outside of the bottom case
Radiation detected
> 7.5 MeV
> 100 keV
> 7 keV
Operating ranges,
response time
50 μSv/h (8 sec)
500 μSv/h (2.5 sec)
5 mSv/h (2 sec)
50 mSv/h (2 sec)
500 mSv/h (2 sec)
Within 10 % of readings between 10 % and 100 % of full scale indication on any range,
exclusive of energy response (calibration source is 137Cs)
Chamber (cc volume air
349 cc
Chamber wall (phenolic)
246 mg/cm2
Chamber window (mylar)
6.6 mg/cm2
Beta slide
440 mg/cm2
In order to achieve energy response consistent with
measurements of H*(10) as required by ICRU-47, aluminum
has been added to the back wall, 38 % of the side wall
area, and to the beta slide. With the Beta Shield open, the
451B-DE-SI can measure skin dose at 10*(0.07), and Deep
Dose H*(10) with Beta Shield closed
Automatic features
Auto-zeroing, auto-ranging, and auto-backlight
Warm-up time
One minute
Display LCD analog/
digital with backlight
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
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 μSv/h or mSv/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
2 Fluke Biomedical
451B-DE-SI Ion Chamber Survey Meter with Beta Slide
Temperature range
-20 °C to 70 °C (-4 °F to 158 °F)
Relative humidity
0 % to 100 % non-condensing (at 140 °F)
Typical energy
Power requirements
Two 9 V alkaline, 200 hours operation
Dimensions (WxDxH)
10 cm x 20 cm x 15 cm (4 in x 8 in x 6 in)
1.11 kg (2.5 lb)
Nitrogen gamma rays are 110 % to 120 % of indicated readings as determined at the
University of Lowell
451B-DE-SI-RYR Ion Chamber
Survey Meter with Beta Slide
and dose equivalent chamber
Optional accessories
451EXL 451 Assistant for
Excel, includes RS-232
interface cable
190HPS Single Unit
Carrying Case
62-103 Check Source,
Cs, 10 µCi. Flat disc,
1-inch diameter
450UCS Check Source,
Uranium, 0.064 µCi,
impregnated, 2 in x 2 in
yellow card
About Fluke Biomedical
Fluke Biomedical is the world’s leading manufacturer of quality
biomedical test and simulation products. In addition, Fluke Biomedical
provides the latest medical imaging and oncology quality-assurance
solutions for regulatory compliance. Highly credentialed and equipped
with a NVLAP Lab Code 200566-0 accredited laboratory,
Fluke Biomedical also offers the best in quality and customer
service for all your equipment calibration needs.
Today, biomedical personnel must meet the increasing
regulatory pressures, higher quality standards, and rapid
technological growth, while performing their work faster and more
efficiently than ever. Fluke Biomedical provides a diverse range
of software and hardware tools to meet today’s challenges.
Fluke Biomedical Regulatory Commitment
As a medical test device manufacturer, we recognize and follow certain
quality standards and certifications when developing our products. We
are ISO 9001 and ISO 13485 medical device certified and our products are:
• CE Certified, where required
• NIST Traceable and Calibrated
• UL, CSA, ETL Certified, where required
• NRC Compliant, where required
Fluke Biomedical.
Better products. More choices. One company.
Fluke Biomedical
6045 Cochran Road
Cleveland, OH 44139-3303 U.S.A.
Fluke Biomedical Europe
Science Park Eindhoven 5110
5692EC Son, The Netherlands
For more information, contact us:
In the U.S.A. (800) 850-4608 or
Fax (440) 349-2307
In Europe/M-East/Africa +31 40 267 5435 or
Fax +31 40 267 5436
From other countries +1 (440) 248-9300 or
Fax +1 (440) 349-2307
Email: sales@flukebiomedical.com
Web access: www.flukebiomedical.com
©2013 Fluke Biomedical. Specifications subject
to change without notice. Printed in U.S.A.
6/2013 6000302A_EN
Modification of this document is not permitted
without written permission from Fluke Corporation.
3 Fluke Biomedical
451B-DE-SI Ion Chamber Survey Meter with Beta Slide
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