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Monitor 4 Geiger Counter

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Brand:
Price:
$369.00
SKU:
M4
Weight:
2.00 LBS
Quantity:
  • Product Description

    m4casetn.jpgThe Monitor 4 detects Alpha, Beta, Gamma, and X-radiations. It also offers 3 operating ranges, a battery check feature, and includes a padded carrying case (right) with belt clip.

    m4panel.jpgA red count light flashes with rising radiation levels, along with an audible click which can be switched off for silent operation (see photo at left).

    Radioactivity also registers on a dual scale analog meter adjustable for 3 operating ranges up to 50 mR/hr or 50,000 CPM (see photo below right).

    Play this sound file to hear the audible clicks of  the Monitor 4, recording 3 different tones, depending on which of the 3 operating ranges is set.mrhr.jpg

     

    In addition to detecting X, Gamma, and Beta radiation, the Monitor 4 is capable of detecting  Alpha radiation by virtue of a thin mica window at the end of the Geiger-Mueller tube.  It is located strategically at the top of the instrument which,  combined with the ergonomic enclosure design, makes aiming the unit at a specific source for Alpha detection that much easier.  See photo at left.m4windowtn.jpg

    This unit also has a Data Output port to record counts on a computer or data logger, as shown in the picture at right.  Click on this link for more on the on data output, and the optional Software accessories.m4dataport.jpg

    The Monitor 4 runs on a single 9 volt alkaline battery (included) which will last up to three months on continuous use at background levels.

    The Monitor 4 is an excellent all-around Pocket Geiger Counter.  The switchable operating range is an especially nice feature if you are dealing with low levels of radioactivity - you can set it to the most sensitive operating range so the meter is easier to read, i.e. the needle will "jump" that much farther for the same level of radioactivity.

    usvhr.jpgFor the same price, the Monitor 4 is also available in a dual-scale meter that reads in µSv/hr (in lieu of CPM), in addition to mR/hr (see picture).  Readouts in µSv/hr are more popular in Canada and overseas.  So please specify which meter configuration you wish to order.

    This item typically ships within 1 business day.m4-response-curve.gif

    Specifications for the Monitor 4 Geiger Counter:  

    Detector

    Halogen-quenched, uncompensated Geiger-Mueller tube with thin mica end window

    Window Size

    1.5 to 2.0 mg/cm² thick; effective diameter is .360”

    Radiation Detected Alpha, Beta, Gamma, X-ray

    Sensitivity

    Detects alpha down to 2.5 MeV; efficiency at 3.6 MeV > 80%

     

    Detects beta at 50 keV w/35% efficiency, at 150 keV w/75%


    Detects gamma and X rays down to 10 keV thru window, 40 keV minimum through case; gamma sensitivity is 1,000 CPM/mR/hr

    Accuracy

    ± 10% of full scale, referenced to Cs-137

    Operating Ranges

    0-.5, 0-5, 0-50 mR/hr. and 0-500, 0-5,000, 0-50,000 CPM

    Optional Meter Range 0-.5, 0-5, 0-50 mR/hr. and 0-5, 0-50, and 0-500 µSv/hr.

    Calibration

    At factory to NBS standard Cesium 137 gamma source

    Anti-Saturation

    Holds full scale in fields as high as 100X maximum reading

    Power Required

    One 9-volt alkaline battery (included in price of the unit)

    Battery Life

    Up to 2,000 hours use at normal background levels

    Temperature Range

    - 20° to + 55° C (- 4° to + 131° F)

    Weight

    215 grams (7.6 oz.) with battery

    Size

    206 x 71 x 48 mm (8.1 x 2.8 x 1.9 in.)

    Indicators

    LED indicator, internally mounted audible beeper for count rate

    Warranty One year limited, includes CE mark

    Country of Make

    USA

    Click on this link for the Operating Manual for the Monitor 4 and Monitor 4EC 

     

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