Instrumentation & Measurement Magazine 23-9 - 41

Fig. 6. (a) Node-red flow implemented in the LoRaWAN Gateway for testing the IoT monitoring platform. (b) Example of messages sent to the dashboard of final
IoT platform.

into the detector chamber. As shown in Fig. 5b, three peaks of
emission can be seen, one associated with Plutonium-239 centered at 5.17 MeV, another with Americium-241 centered at
5.55 MeV, and the last one associated with Curium-244 centered at 5.77 MeV.
Finally, the whole platform was implemented, and a screenshot of all three detectors working together can be seen in Fig.
6a, where the Node-Red flow implemented on the LoRa gateway to send the measurement results to the IoT platform is
shown. As it can be appreciated, data are differently decrypted
according to the specific LoRa address of the sensor node; each
message contains both general information (referred to as " Attributes " and including node ID and operating status) and
measurement results (referred to as " Telemetry " ). Required information are encapsulated in a message whose topic is equal for
all of the nodes ( " v1/devices/me/telemetry, " Fig. 6b), and the
association with the specific node is granted by the token (i.e., a

password unique for each node) adopted to open the connection
with the ThingsBoard platform. As an example, a monitoring platform consisting of nodes based on Geiger sensors and
monitoring the environmental radiation in three buildings of
University of Naples Federico II located in different geographical areas is shown in Fig. 7; all of the sensors are georeferenced
and their position can be appreciated on a suitable map (Fig. 7).
The counts associated with each sensor are represented in terms
of either instantanueus values by means of gauges and in tabular form or evolution versus time; since the measures are saved
in a proper database, the platform user can select a specific time
interval to be plotted. It is worth noting that the measured counts
are fully compliant with the natural ground radiation.

Conclusion
This paper presented a platform for environmental radiation monitoring; to this aim, the platform implemented and

Fig. 7. Example of dashboard exploited in ThingsBoard for radiation monitoring.
December 2020	

IEEE Instrumentation & Measurement Magazine	41



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