PRM-9000 Geiger Counter

Handheld Alpha, Beta, Gamma, X-Ray Geiger Counter – Nuclear Radiation Contamination Detector & Monitor

This is the PRM-9000 Geiger counter. It emits an audible chirp each time a radioactive particle is detected, and also has a user settable audible dose-rate alarm.
PRM-9000 Geiger Counter

The PRM-9000 Geiger counter includes the same two-inch (50.8 mm) pancake detector tube that is the gold-standard for radiation surveys. Such as, surveying areas for potentially harmful ionizing radiation levels and for detecting radioactive contamination of packages, items, equipment and people.

Further, this instrument is suitable for regulatory inspections, and for the detection, measurement and monitoring of broad spectrum, low energy radionuclides, including Naturally Occurring Radioactive Material (NORM).

In addition, the detection sensitivity combined with the feature-set outlined below is very capable. As a result, the PRM-9000 offers one of the most compelling price/performance values in the industry.

If using a Geiger counter and measuring nuclear radiation is new to you, click here for some useful information.

The PRM-9000 Geiger counter is accurate, reliable and made in the USA. Moreover, this nuclear radiation detector is an ideal solution for individuals, health physics professionals, educators, researchers, outdoor enthusiasts and rock collectors.

Unique 24/7 Monitoring Capability

This photo shows the backside of the instrument and the window for the two-inch pancake Geiger tube.
PRM-9000 Two-Inch Pancake Detector Window

The instrument is designed to continuously collect measurements and statistics enabling complete environment assessment. This vital capability is not available on similarly priced Geiger counter products.

Using only one key, users can scroll through several screens that display present, average, maximum and minimum measurements in uR/hr, mR/hr, uSv/hr, Counts per Second (CPS) or Counts per Minute (CPM).

This radiation meter not only records the maximum radiation measured, but also displays the time and date at which the maximum reading occurred. Conventional Geiger counters require the user to be looking at the radiation meter to capture such events.

Industry Leading Battery Life

The battery life of this radiation detector and monitor is over 4 1/2 years under normal conditions from a single, readily available, 9-volt lithium battery that is user-installable without soldering. Standard alkaline 9-volt batteries, available virtually everywhere, provide over 2-years of life under normal conditions.

Data Logging and USB Connectivity

With over 100K bytes of internal data logging memory included, this Geiger counter can autonomously (without the need for a PC) store up to 91,466 minutes or hours of time-stamped measurements. These measurements can then be uploaded later to a PC in CSV format for analysis.

A user-settable dose rate alarm sounds an audible alert when the measured radiation level exceeds that of the alarm level setting.

This Radiation Meter is Made in the USA

Designed by Mazur Instruments and manufactured in the USA, the PRM-9000 Geiger counter and nuclear radiation monitor includes abundant I/O options including support for headphones, external speakers, external power and USB data exchange (Requires Optional 3.5mm to USB Adapter Cable).

PRM-9000 General Purpose Geiger Counter


Battery Life1

Standard 9V Lithium42,850 Hours / 4.89 Years
Standard 9V Alkaline20,150 Hours / 2.30 Years (included)

Measurement Front End

DetectorLND 7317 Pancake Geiger-Muller tube, Halogen-quenched with mica window and 45mm (1.75 inch) effective diameter
Radiation Detectedalpha, beta, gamma and x-radiation
Energy Sensitivityalpha: minimum 2.0 MeV
beta: minimum 0.16 MeV with 25% efficiency at 1 MeV
gamma/X rays: min 10 keV (window)

gamma sensitivity: 3,500 CPM/mR/hr
calibrated to Cesium-137 (Cs137)
Accuracy±10% Typical, ±15% Maximum
Measurement Ranges0.001 to 125 mR/hr
0.01 to 1,250 uSv/hr
1 to 125,000 uR/hr
1 to 437,500 CPM (3,500 CPM/mR/hr)
0 to 7,291 CPS (58.33 CPS/mR/hr)
Total Count: 0 to 4,294,967,295 (32 Bit Integer)
Measurement StatisticsContinuous availability of Elapsed Time, Average, Minimum and Maximum dose rate in either uR/hr, mR/hr, uSv/hr, CPS or CPM

Time stamp on new maximum
Timed MeasurementSelectable 1, 5, 10, 20, 30, 60 and 90 minute interval
Dose Rate AlarmAlarm can be set in mR/hr or uSv/hr to any value within the measurement range

Internal Data Logging

Storage100,000 Bytes non-volatile memory
Logging IntervalsEvery Minute or Every Hour
Maximum Capacity91,466 Minutes or Hours
(90% Normal Background, 10% Full-Scale)
Minimum Capacity32,656 Minutes or Hours
(100% Full-Scale Measurement Levels)
Logging Output FormatStandard Comma Separated Value (CSV) with time stamp and CPM Data (3,500 CPM/mR/hr)

User Interface

Languages SupportedEnglish and Japanese
DisplayTwo-Line, 14 character transflective LCD with back light for low light conditions
KeypadWeather resistant commercial-grade membrane keypad
Visual IndicatorLED pulses on and off when a radiation detection event occurs. LED can be disabled.
Audio IndicatorTone beeps when a radiation detection event occurs. Audio three volume levels and can be muted.

Input / Output

Audio Output / Digital InterfaceStandard 3.5mm jack with three selectable volume levels for output to audio systems, computer speakers or media player headphones.

Jack can also be provisioned by the user for pulse output or as a USB Interface for logging data by PC or transferring internal data logging memory (requires optional cable)
External Power9 VDC at a minimum current rating of 100mA

Environmental / Physical

Temperature Range-20° to 51° C (-4° to 125° F)
Size143 x 83 x 35 mm (5.63" x 3.25" x 1.37")
Weight368 grams (13 oz.) including battery
ComplianceCE, Lead-Free

Independently tested and found to be substantially compliant with FCC requirements for home use. Approval to display FCC logo pending.


 One Year (120 Days on GM Tube)


    1. Assuming that background radiation is less than 85 CPM, the device is using the low-power setting and temperature of operation is 25° C (77° F).

All specifications are subject to change without notice.

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