Vernier Software and Technology
Vernier Software & Technology
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Go Direct Radiation Monitor Troubleshooting and FAQs

Go Direct® Radiation Monitor, order code GDX-RAD, $179
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Connect the Radiation Monitor and start Graphical Analysis. Verify that the Radiation Monitor is automatically identified. Next, place the Radiation Monitor near a radioactive source and collect data. Look at the LED, labeled αβγ, on the body of the Radiation Monitor - it will flash with each count; optionally turn on the audio signal to listen for counts. The total counts will accumulate in the data-collection software.

USAGE TIPS
- Tip 1: The Radiation Monitor measures total counts during the data-collection period, including any background radiation. A simple way to estimate the background radiation in your location is to run the Radiation Monitor without any radioactive source nearby for the same duration as your experimental trials. The total counts during that time interval will give you an idea of how much background radiation you can expect during each of your experimental trials.

- Tip 2: Alpha particles interact easily with other matter and may be intercepted by the air between the source and the Radiation Monitor. If you are using an alpha source, be sure to place the Radiation Monitor within 1/4" of the source. Likewise, alpha particles (and low energy beta particles and gamma radiation) do not have the energy to penetrate the plastic body of the Radiation Monitor. Place your source close to the wire screen at the end of the tube for the best reading.

RELATED ARTICLES
TIL 3206: What are the similarities and differences between radiation monitors?
TIL 2941: How can you tell whether you have alpha, beta, or gamma radiation?
TIL 793: Can I monitor the radioactivity of red Fiestaware with your Radiation Monitor?
TIL 1019: Where can I buy sources for nuclear radiation activities?

SPECIFICATIONS
Sensor: LND 712 (or equivalent) halogen-quenched GM tube with a mica end window, 1.5 to 2.0 mg/cm2 thick
Gamma sensitivity: 18 cps/mR/he referenced to Co-60
Temperature range: -20-50˚C
Operating range: CPS 0-3,500
Shortest count interval: 20 milliseconds

CALIBRATION
None.

WARRANTY
The GDX-RAD has a 5 year overall warranty, with a 1 year warranty on the GM tube. The GM tube has a finite life span, and it is normal that it must be replaced after a few years (although some tubes last much longer).
Tubes that fail within a year of purchase will be replaced under warranty.
Tubes that fail after a year will be replaced for a fixed fee of $89.
Tubes that are punctured will not be replaced under warranty.

RELATED VERNIER PRODUCTS
Nuclear Radiation with Vernier, order code NRV
Vernier Radiation Monitor, order code VRM-BTD, $169

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