This sensor is no longer available. Information is presented for reference only.

Digital Radiation Monitor (DRM-BTD, discontinued)

• Specifications and User Guide
• Extended User Manual

Troubleshooting

• Primary Test: Turn on the Digital Radiation Monitor to audio position, and set the upper switch to CPM. Does the screen settle to a fluctuating small number (~0-20 cpm)? It should not always be zero, but might sometimes read zero.
• Secondary Test: Connect cable to Digital Radiation Monitor and a LabQuest interface (any model). Does the software recognize the Digital Radiation Monitor? Does the meter count increment?
• Tertiary Test: Set LabQuest App for time-based data collection (60 s count interval, 6000 seconds) and collect data. The time series should be random, neither increasing nor decreasing. FFT should be Gaussian.

Sensor Compatibility

Additional Troubleshooting

• What are the output signals of the Radiation Monitors?
• Can I monitor the radioactivity of red Fiestaware with your Radiation Monitor?
• My Digital Radiation Monitor won't produce count rates over 500 cpm.
• My Digital Radiation Monitor occasionally reads counts that are unreasonably high.
• Why doesn't the meter on the front of the Digital Radiation Monitor more closely match the software?
• Can I use a wired (BTD) Radiation Monitor with TI calculators?
• What sensors do not work with Go!Link?
• What is the difference between RAD-BTD and RCD-BTD, or the old and new radiation monitor cables?
• Does the Digital Radiation Monitor work with the TI-Nspire Lab Cradle?

Specifications

• Sensor: LND 712 (or equivalent) halogen-quenched GM tube
  ⚬ mica end window thickness: 1.5 to 2.0 mg/cm²
  ⚬ 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

Calibration

Calibrate? No. The sensor is calibrated for Cesium-137, but also serves as an excellent indicator of relative intensities for other sources of ionizing radiation. The Radiation Monitor does not detect neutron, microwave, radio frequency (RF), laser, infrared, or ultraviolet radiation.

Related Products

• Cable for Digital Radiation Monitor (RCD-BTD)
• Vernier Radiation Monitor (VRM-BTD)
• Go Direct^® Radiation Monitor (GDX-RAD)

Legacy Products

• Radiation Monitor Troubleshooting and FAQs
• Student Radiation Monitor Troubleshooting and FAQs