Monitor for radioactive radiation based on STS-6 (CTC-6) Geiger tube. Sensitive to gamma and hard beta. Transmission every 60 seconds. Dose rate is estimated from pulse rate with fixed factor. Normal level is just below 0.1 µS/h.
Radioactivity readings with a Geiger Müller kit from Landshut in germany. Measured with a SBM20 tube.