|Ludlum Ion Chamber Survey Meter.|
APPLICATION: Gamma and X-ray exposure survey meter with beta response.
RANGE: 0 - 50 R/hr
ENERGY RESPONSE: +/- 20% of true value from 40 keV - 2 MeV
LINEARITY: Reading within 10% of true value
RESPONSE TIME: Approximately 5 seconds for 90% of final meter deflection on the x1 and x10 scales, and 3 seconds on the x100, x1k and x10k scales
BETA RESPONSE: Factor of 4.8 difference betwen window open and closed measurements when exposed to a uranium slab.
CHAMBER VOLUME: 220 cm3
CHAMBER CONSTRUCTION: Carbon coated acrylic
SIDE WALL: 1000 mg/cm² aluminum and acrylic
BETA SHIELD: Retractable 1000 mg/cm² phenolic slide with side button control
| WINDOW: 7 mg/cm² aluminized mylar|
WINDOW AREA: 40 cm²
COMPENSATION: Automatically corrects for temperature and pressure changes in atmosphere
TEMPERATURE RANGE: -4°F to 122°F (-20°c to 50°C). Temperature compensation maintains calibration within 15% of 25°C reading
PRESSURE COMPENSATION RANGE: 70 kPa to 106 kPa
METER: 2.5" (6.4 cm) arc, 1 mA, pivot-and jewel suspension
METER DIAL: 0 - 5 mR/hr, BAT TEST
POWER: 2 each "D" cell batteries housed in a sealed externally-accessible compartment
BATTERY LIFE: 400 hours
CONSTRUCTION: Cast and drawn aluminum with beige powder-coating
SIZE: 9.2" H x 3.5" W x 8.5" L (23.4 x 8.9 x 21.6 cm) including instrument handle
WEIGHT: 4.2 lbs (1.9 kg) including batteries
|Ion Chamber Survey Meter with Beta Slide.|
The Model 451B state-of-the-art ion chamber survey meter is a hand-held battery operated unit designed for use in both
rugged and normal environments. The Model 451B measures alpha, beta, gamma and x-ray radiation. The Model 451B employs
microprocessor and LCD technology and 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 and enables beta
discrimination. 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. The user must specify R or Sv when ordering.|
The display features an analog bar graph, 2.5 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 Police and Fire Departments, x-ray manufacturers, government agencies, state inspectors, emergency response and HAZMAT teams, nuclear medicine labs, hospital radiation safety officers, and nuclear power industry.
Radiation Detected: Alpha above 4 MeV, Beta above 100 keV, and Gamma above 7 keV.DETECTOR:
ACCURACY: Within 10% of reading between 10% and 100% of full scale indication on any range, exclusive of energy response. Calibration source is 137Cs.
Chamber: 349 cc volume air ionizationControls: ON/OFF and MODE.
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
|Automatic features: Auto-zeroing, auto-ranging, and auto-backlight|
Power requirements: Two 9 V alkaline, 200 hours operation
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.Modes:
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 0.25 in (6.4 mm) 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.Environmental:
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 + 158°F (-20°C to +70°C)
Relative humidity: 0 to 100%, @ + 60°C
Geotropism: Less than 1%
Typical energy dependance: Shown on graph presented here.
Dimensions: 4 (w) X 8 (d) X 6 inches (h) (10 X 20 X 15 cm)
Weight: 2.5 lbs. (1.11 kg)
|Excel Assistant for 451 Series Meters.|
The 451 Assistant for Excel is an Excel Add-in, a program that adds optional commands and features to Microsoft® Excel. The 451 Assistant provides remote control for many of the 451 functions, real-time data logging with user defined alarm parameters and a real time virtual instrument display. The 451 Assistant automatically loads with Excel once it is installed.
The 451 Assistant data logging function automatically records real time measured data in an active Excel worksheet. Each measurement in the data log is automatically placed in the active worksheet cell, then the active cell moves down to the next row of cells where it will place the next set of measured data. Each recorded measurement is time and date stamped. The 451 Assistant provides user configurable audible and visual alarms for the real time logged data. The picture and data shows radiation levels above the preset alarm in red, the blue data represents the radiation level below the alarm
|that has not been acknowledged. The black data shows when the alarm was acknowledged. See Control Options for more
The 451 Assistant for Excel allows the user to configure the 451's internal data logging and alarm settings. It may also be used to download the 451's internal data log and saves it in an Excel worksheet where it can be easily graphed for quick trend analysis.
The 451 Assistant provides automatic timed integrated dose measurement over a user defined integration period or user controlled integrated dose measurement. After the integration timer has expired or the user has stopped integration, the 451 Assistant retrieves the integrated dose from the 451 and inserts the integrated dose in the active worksheet cell and the average dose rate is placed in the next cell to the right.
This Model 451EXL information management software program is ideal for the facility Radiation Safety Officer or anyone responsible for maintaining a permanent record of spills and accidents for adjerence to state and NRC requirements. The remote control of the 451 series of Ion Chambers may be accessed by any computer on your facility network providing remote information management.
The 451 Assistant menu and toolbar provide an interface for the user to remotely control the 451, configure the 451, download the 451's internal data log and start / stop real time data logging and integrated dose measurements
Connect / Disconnect Connects or disconnects the 451 to the computer's communication port
Start / Stop Starts and stops computer data logging. When data logging is started, logged data is placed in the active Excel worksheet and the worksheet is protected to provide data security
Logging Properties Allows the user specify computer data logging parameters. The data logging sample interval (2 seconds to 999 hours), total data logging period (2 seconds to 49 days) and computer date log alarms may be specified
|through this menu. These parameters are independent of the 451's internal data logging functions|
Integrate... Allows the user to select timed integrated dose measurement or user controlled integrated dose measurement. The user may also specify the integration period for timed integration from 1 minute to 999 hours. When timed integrate mode is selected, the 451 Assistant for Excel stops the integrated dose measurement after the specified integration period has expired.
When timed integrate mode is not selected, the user controls the integration period and the integration time is displayed in real time. The integrated dose and average dose rate are recorded in the active Excel worksheet when integration is complete
Download Log The 451 is capable of internally logging data at a user defined interval from 1 to 255 seconds with a total capacity of up to 2700 data points. This feature allows the user to download the 451's internal data log into the active Excel worksheet
Options Allows the user to change many properties of the 451 Assistant for Excel and several of the 451's properties. The user may configure the various visual and audio alarm features of the 451 Assistant for Excel for each data point that is logged. The 451 Assistant can be configured to use 2 or 4 alarm states. The four alarm states are acknowledged normal (below alarm level), unacknowledged normal, acknowledged alarm and unacknowledged alarm. The user may also select the communication port used by the 451 (default is COMI). The 451's internal data logging parameters and alarm settings may also be changed from the Options menu