Model 451B®

Ion Chamber Survey Meter

The Model 451B® is the successor to the highly successful Model 450B® rugged, light-weight portable survey meter featuring a thin window ionization chamber with a sliding beta shield, microprocessor technology and an auto-on backlit analog/digital liquid crystal display.

The ionization chamber has a thin mylar window for excellent low-energy X-ray response and detection of alpha and beta particles.  The window is protected by a stainless steel mesh and a beta slide that provides buildup.

It is simple to operate; only ON/OFF and MODE buttons are needed because the microprocessor controls both auto-ranging and auto-zeroing.

The display of the 451B® is unique: the 2-1/2 digit display provides reading accuracy for shielding studies while the 100 element analog bar graph, with a faster time constant, makes the instrument ideal for surveying changing radiation levels.  The integrate (dose) mode registers scatter doses from the shortest radiographic exposures.  Integration begins 30 seconds after the instrument has been turned on and it operates continuously even while in the rate mode.  Just press the MODE button to switch to integrate and read the dose that has accumulated during the survey.

The RS-232 interface used with Excel add-in for Windows® allows for data retrieval and user parameter selection while providing virtual instrument display.

The rugged case is sealed against moisture and is available in red/yellow/red (RYR suffix).  The 451B® is also available in Dose Equivalent SI units (specify DE-SI suffix).

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