Fluke 451B ionization chamber inspection instrument, ionizing radiation measuring instrument

451BThe ionization chamber detector is from the United StatesFLUKEThe company has launched a handheld, highly sensitive ionizing radiation detection instrument, which combines the latest research results and manufacturing processes, and adopts multiple industry-leading new technologies to effectively ensure451BUnder normal conditions, it has the best detection performance among similar products, and good protection equipment can ensure even in extremely harsh environments451BStill able to work normally.

451BThe ionization chamber inspection device is a battery powered handheld device that uses the latest technologyCMOSandLCDTechnology, measurable above4 MeVofαRadiation, higher than100 keVBeta rays, as well as those higher than7 keVofγandXRay.451BThe shell is made of high-strengthABSMade of plastic. The instrument is equipped with a gasket and desiccant packaging to prevent moisture from entering the device, and provides a cushion for internal components. The measurement readout device includes a high contrast LCD display screen and a100Segmental simulation bar chart. The bar chart includes a zero grid20Group by Group5Segmentation of grids. There is a permanent scale on the display screen. The large grid of the ruler represents the unit corresponding to the measurement range of the instrument. The measurement unit is directly displayed on the screen. When the instrument is in the corresponding mode, it will be displayed on the screen“LOW BAT”(Low battery level) and“FREEZE”(Freeze) symbol. The external control switch includes an on/off switch/Close button and one“MODE”(Mode) button. The instrument has automatic range and zero adjustment functions. When the on-site conditions are dim, the backlight will automatically activate.451BProvided a user configurable audio alarm function. Two sections9 VThe battery is located on the back of the instrument and can provide200A continuous working time of one hour. Provided a440 mg/cm2Resin shielding can shield against beta rays. This shielding can also provide a balanced thickness for optical quantum measurement and protect the polyester film window.

Instrument characteristics

1. overload

if451BThe instantaneous radiation rate measured by the inspection instrument exceeds50 R/h（0.5 Sv/h），R/hWithin the organization“R”reachSv/hWithin the organization“Sv”Flashing will indicate to the user that the radiation field exceeds the measurement range of the instrument. In addition, under such conditions, there may be potential errors in the measured integrated radiation values. After clearing the integral value, the display screen stops flashing.

2. Low battery level indicator

When it first appears on the screen“LOW BATTERY”When marking, you can also use approximately6One hour of working time. equal“LOW BATTERY”When the marker flashes, the working time is insufficient1An hour. These times refer to the installation of two batteries and are calculated from the first occurrence of these states. If the instrument is turned off when the battery is low, the battery will slightly recover some power, but the working time is still relatively short.

3. Audio alarm

The audio alarm setting point is connected to the calculationRS-232 COMThe port is set up using relevant software. The step size for setting the audio alarm setpoint is1%Full scale, that is, from the full scale1%～100%In the menu“A”The command can operate the scale and percentage setting points. When the reading reaches or exceeds the set point, an audio alarm will be triggered.

4. Integration Mode

In terms of points（Integrate）In the mode,451BIt can display the integrated radiation level. The maximum radiation dose can be integrated to999 R（9.99 Sv）.

5. freeze mode

Freezing（Freeze）In mode, a marker will be displayed on the bar chart to indicate the peak value and lock the maximum range. The instrument will continue to read and display the current reading.

6. Backlight

451BEquipped with backlight illumination function, it will automatically turn on when the ambient lighting conditions are below the preset value. When the environmental lighting conditions exceed the preset value, the backlight lighting will be turned off, and the preset value is set by the factory.

Application:

451BExcellent on-site inspection capabilities make it widely used in various industries, including police and fire departmentsXManufacturers of radiation equipment, government agencies, supervisory personnel, emergency response and hazardous material disposal personnel, nuclear medicine laboratories, hospital radiation safety officers, and nuclear power plant workers.

Main applications:

l Radiation Safety Advance Team

l emergency response team

l XOptical manufacturer

l Coast Guard Inspector

l Homeland Security Bureau

l hospitalXLight Room

l Department of Environmental Safety and Public Safety

l University laboratories, nuclear research institutes, etc

l Biomedical Research Laboratory

l nuclear power plant

……

Technical performance:

1.Detectable radiation:Alpha(Above)7.5 MeV）, Beta(Above)100 keV）, and Gamma(Above)7 keV）

2.Measurement range: 0 - 50µSv/h，0-500µSv/h，0-5mSv/h，0-50mSv/h , 0-500mSv/h

3.Accuracy: displayed on the full scale at any range10%To100%Between them is10%The calibration source is137Cs.

4.detector:Ionization chamber:349 ccair ionization chamber

Ionization chamber wall: 246 mg/cm2Thick, phenolic resin

Ionization chamber window: 6.6 mg/cm2 MylarPolyester film,Steel mesh protection,46 cm2 Detection area

Beta slide: 440 mg/cm2

451B-DE-SI:Based on complianceICR4-47Aluminum has been added to the rear and side wall areas to achieve the required measurement response38%AndBetaSkate. When activatedBetaSkate,451BIt is possible to measure skin dose, whileBetaMeasure deep dose when the skateboard is closed

5. Response time:0 arrive5 mR/h (0arrive50 µSv/h) – 8second

0 arrive50 mR/h (0arrive500 µSv/h) – 2.5second

0 arrive500 mR/h (0arrive5 mSv/h) – 2second

0 arrive5 R/h (0arrive50 mSv/h) – 2second

0 arrive50 R/h (0arrive500 mSv/h) – 2second

6.hold control:Automatic reset, automatic range, and automatic backlight illumination

7.electricity source: 9VAlkaline battery, two sections 200Hour operation time

8.Warm-up time: 1minute

9.model type:

1)accumulation mode:exist451BAfter starting up, work continuously30In seconds. That is, the display unit ismRperhapsR/hWhen, the accumulation mode can still be executed

2)freeze mode:Place markers on the bar chart to maintain peak values.451BWill continue to read and display the current radiation dose value

10.Display: LCD simulation with backlight/digital display

11.Simulation: 100Barcode displays density and length6.4cmThe barcode area is divided into5A major region, reference451BThe measurement range is indicated by appropriate identification values for each area.

12.Number: 2The half display is followed by a valid zero position (see451BDepending on the operating range. The measurement unit will always be displayed. Measure the digital height as6.4mmLow battery and freeze indicators are also provided on the display.

13.Environmental requirements - 20°arrive+ 70°C0arrive100%,exist+ 60°C Less than1%

14.Physical dimensions 10 x 20 x 15 cm

15.weight:1.11kg