Digital Radiation Monitor

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Use the Digital Radiation Monitor to monitor alpha, beta, and gamma radiation for explorations in radiation statistics, measuring the rate of nuclear decay, and monitoring radon progeny.


The Digital Radiation Monitor consists of a Geiger-Mueller tube and a digital rate meter mounted in a small, rugged, plastic case. The unit is battery operated and can be used with or without an interface for measurement of alpha, beta, and gamma radiation. When used with an interface such as LabQuest, it can be used to study counting statistics, inverse-square relations, shielding effects, and other quantitative experiments. Without an interface, use the built-in counter and timer to measure count rates.



  • Sensor: LND 712 (or equivalent) halogen-quenched GM tube with a mica end window, 1.5 to 2.0 mg/cm² thick. Rated at 1000 counts per minute using a Cesium-137 laboratory standard.
  • Power: One 9-volt alkaline battery provides a battery life of 2000 hours at normal background radiation levels.
  • Accuracy: ±10% typical, ±15% max. (mR/hr and µSv/hr modes)
  • Dimensions: 150 x 80 x 30 mm (5.9″ x 3.2″ x 1.2″)
  • Weight: 225 g (8 oz) with battery installed
  • Energy Sensitivity: 1000 CPM/mR/hr referenced to Cs-137
  • Audio Output: Chirps for each count (operational in audio mode only–can be muted)
  • Temperature Range: –20°C to 50°C
  • Operating Range:

    • mR/hr: 0.001 to 110
    • CPM: 0 to 350,000
    • Total: 1 to 9,999,000 counts
    • µSv/hr: 0.01 to 1100
    • CPS: 1 to 3,500

Download the user manual for full specifications Download the extended user manual for additional specifications

Experiments and Lab Ideas

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What’s Included

  • Vernier Digital Radiation Monitor
  • Data-collection interface cable
  • User manual

Sensor Requirements

The Digital Radiation Monitor requires a compatible interface and software to collect data. Interface and software sold separately. Getting started with probeware »

Compatible Interfaces

The Digital Radiation Monitor is compatible with these interfaces:

Ordering Information

All prices are for U.S. educators.

    NameOrder CodePriceQuantity
    Digital Radiation MonitorDRM-BTD$299

    Related Products

    Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »

    Order Code DRM-BTD
    U.S. Educator Price $299

    Sample Data

    Radiation counts
    Radiation counts
    Counts/interval vs. time and distance
    Counts/interval vs. time and distance
    Counts/interval vs. thickness of filter
    Counts/interval vs. thickness of filter
    Radiation during an airline flight
    Radiation during an airline flight
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