Libelium designed a wireless sensor network for measurement and controlling radiation levels in the environment. The creation of the Radiation Sensor Board has been motivated by the nuclear disaster in Fukushima after the unfortunate earthquake and tsunami struck Japan. Libelium wanted to help authorities and security forces to measure the levels of radiation of the affected zones without compromising the life of the workers. For this reason they have created an autonomous battery powered Geiger Counter which can read the radiation levels automatically and transmit the information in real time using wireless technologies like ZigBee and GPRS.

Radiation Levels Measurement & Controlling Wireless Radiation Sensor NetworkThe idea is simple, each node acts as an autonomous and wireless Geiger Counter. It measures the number of counts per minute detected by the Geiger tube and send this value using ZigBee and GPRS protocols to the control point. The system is powered with high-load internal batteries what ensures a lifetime of years.

With this technology radiation measurements can be known in real time without compromising the life of the security corps members as they do not have to be inside the security perimeter in order to activate the Geiger counters. The information is extracted automatically and sent wirelessly to the Gateway of the network.

Prevention and Control Radiation Sensor Network

The Prevention and Control Radiation Sensor Network is formed by dozens of sensor devices deployed in the surroundings of the nuclear power plant and reaching the closest cities. Sensor nodes are installed in street lights and threes and take power from the internal battery which, at the same time is recharged using a small solar panel giving unlimited lifetime to the system. The nodes read the value of the Geiger tube during an specific time interval and calculate the number of counts per minute which are generated by the interaction of the radioactive particles. Then this value is sent using the ZigBee radio to the Gateway of the network which stores the information in an Internet data base.

Emergency Radiation Sensor Network

If a radiation leakage occurs in a place where there is not a previously installed radiation sensor network, an emergency deployment can be done in just a couple of hours. Security corps just need to spread the sensor nodes on the ground at certain places. Sensor nodes will take the power from special high load internal batteries which will ensure the control network to be working for months. Each of these points will send the information by using a TCP/IP connection through the GPRS network or sending SMS alarms when the values are over a certain threshold.