Fluke Biomedical 451B-RYR Ion Chamber Radiation Meter Detector

Fluke BioMedical 451B-RYR Ion Chamber Survey Meter with Beta Slide and standard chamber


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 includes a sliding beta shield to serve as an equilibrium thickness for photon measurements and enables beta discrimination. 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 and visual alarm indication.


Key features:
• Measures skin dose (slide open) and deep dose (slide closed)
• High sensitivity measurement of rate and dose simultaneously
• Records peak rate using “Freeze Mode”
• 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
• Available with dose equivalent energy response (SI units)

Specifications
Radiation detected
Alpha	> 7.5 MeV
Beta	> 100 keV
Gamma	> 7 keV
Operating ranges, response time	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
Warm-up time	One minute
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
Modes
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
Environmental
Temperature range	-20 °C to 70 °C (-4 °F to 158 °F)
Relative humidity	0 % to 100 % (at 140 °F
Geotropism	< 1 %
Typical energy dependence	16Nitrogen gamma rays are 110 % to 120 % of indicated readings as determined at the University of Lowell
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)
Weight	1.11 kg (2.5 lb)

For full FLUKE 451B product specifications, please click here: Fluke 451B

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