 High sensitivity (µR measurements 451P) measurements of exposure and exposure rate- Available with dose equivalent energy response (SI units)
- Fast response to measure radiation from leakage, scatter beams, and pinholes
- Ergonomic, anti-fatigue handle with replaceable grip and wrist strap
- Sliding shield for alpha and beta discrimination (451B)
- Excel add-in for Windows® for data logging and selection of instrument operating parameters (optional)
- Low noise chamber bias supply for fast background settling time (451B) or reading (451P)
- Easy touch keys
Features
- Ideal for wide range of applications including NDT, X-ray, and environmental
- Battery operated
- Auto-ranging and auto-zeroing
- RS-232 communications interface
- Measures rate and dose simultaneously
- Tripod mount for stationary, area monitor application
- Freeze mode indicates peak reading
- Programmable flashing display and audible alarm (451B)
- Automatic, ultra-bright LCD display
- Separate integrate mode (451P)
- Excel add-in for Windows® (optional)
• Real-time data logging
• Downloading of 2700 data sets stored in instrument
• Virtual instrument display with audible and visual alarm indication
• Supports user instrument configuration and parameter selection
• User selectable modes
Model 451B and 451P state-of-the-art ion chamber survey meters are hand-held battery operated unit designed for use in both rugged and normal environments. Both models employ microprocessor and LCD technology.
Model 451B measures alpha, beta, gamma and X-ray radiation. This survey meter features a rugged ionization chamber with a mylar window and protective steel mesh. An integral beta shield serves as an equilibrium thickness for photon measurements.
Model 451P features a pressurized ionization chamber providing enhanced sensitivity and improving energy response to measure gamma and x-ray radiation.
The ergonomic handle, features a large diameter cushioned grip and is designed to reduce fatigue associated with extended use. The case is constructed of lightweight, high strength materials and is sealed against moisture.
On both models the display features an analog bar graph, 2 1/2 digit digital readout, low battery and freeze mode indicators. User controls consist of an ON/OFF button and a MODE button. The unit is auto-zeroing and auto-ranging. The display features circuitry that automatically activates the backlight in low ambient light conditions.
The RS-232 interface can be connected directly to a computer for use with the Excel add-in for Windows®, enhancing the functionality of the instrument. The software allows for data retrieval, user parameter selection and provides a virtual instrument display with audible (requires sound card) and visual alarm indication. The software may be customized by the user for specific applications.
Applications
The Model 451B is ideal for site surveys and a wide range of medical and health physics applications. It is regularly used by
X-ray manufacturers, nuclear medicine labs, and hospital radiation safety officers
Model 451P is used in a wide range of medical and health physics applications. The Model 451P was designed to measure leakage and scatter around diagnostic X-ray and radiation therapy suites. Also, the Model 451P is ideal for site surveys and is regularly used by X-ray manufacturers and biomedical technicians.
Specifications for both 451B and 451P
Accuracy: Within 10% of reading between 10% and 100% of full scale indication on any range, exclusive of energy response. Calibration source is 137Cs.
Controls: ON/OFF and MODE
Automatic Features: Auto-zeroing, auto-ranging, and auto-backlight.
Power: Two 9-volt alkaline, 200 hours operation.
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 1/2 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 1/4 in (6.4 mm) high. Low battery and freeze indicators are also provided on the display.
Dimensions: 4” W x 8” D x 6” H
Weight: 2 lb 7 oz.
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.
Specifications 451B - Item 343-451 & 343-452
Radiation Detected:
Alpha above 4 MeV
Beta above 100 keV,
Gamma above 7 keV.
Operating Ranges:
0-5 mR/h or 0-50 µSv/h
0-50 mR/h or 0-500 µSv/h
0-500 mR/h or 0-5 mSv/h
0-5 R/h or 0-50 mSv/h
0-50 R/h or 0-500 mSv/h
Detector:
Chamber: 349 cc volume air ionization.
Chamber wall: 246 mg/cm2 thick phenolic.
Chamber window: 1.7 mg/cm2 mylar, protected by steel mesh, 46 cm2 detection area.
Beta slide: 440 mg/cm2.
Response Time:
Range: 0-5 mR/h (0-50 µSv/h) - 8 seconds
Range: 0-50 mR/h (0-500 µSv/h) - 2.5 seconds
Range: 0-500 mR/h (0-5 mSv/h) - 2 seconds
Range: 0-5 R/h (0-50 mSv/h) - 2 seconds
Range: 0-50 R/h (0-500 mSv/h) - 2 seconds
Warm-Up Time: One Minute
Environmental:
Temperature Range: -40°C to + 70°C
Relative Humidity: 0 to 100%, @ + 60°C.
Geotropism: Less than 1%
Specifications 451P - Item 343-455 & 343-456
Radiation Detected: Beta above 1 MeV
Gamma and X-rays above 25 keV
Operating Ranges: 0-500 µRh or 0-5 µSv/h
0-5 mR/h or 0-50 µSv/h
0-50 mR/h or 0-500 µSv/h
0-500 mR/h or 0-5 mSv/h
0-5 R/h or 0-50 mSv/h
Detector: Chamber: 300 cc volume pressurized air ionization chamber to 6 atmospheres
Response Time:
Analog response time from 10% to 90% of reading for a full scale step increase is dependent on operating range. Response time for a step increase in radiation exposure rate from background:
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