Digital Radiation Monitor (DRM-BTD, discontinued)
Specifications and User Guide
Extended User Manual:

– Primary Test:
Turn on the DRM 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.

Connect cable to DRM and LabQuest, LabQuest 2, LabQuest Stream, or LabQuest Mini. Does the software recognize the DRM? Does the meter count increment?

– Secondary Test:
Set LabQuest 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.

Product Overview
What are the output signals of the Radiation Monitors?

Data Collection
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 my Radiation Montior with TI calculators?

Hardware Compatibility
What sensors are not compatible 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?

Legacy Products
Radiation Monitor Troubleshooting and FAQs
Student Radiation Monitor Troubleshooting and FAQs

– order code: DRM-BTD
– 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 �Sv/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
     ï¿½Sv/hr: 0.01 to 1100
     CPS: 1 to 3,500

– Calibrate? No.
It 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.