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Which are the technical characteristics that should  be taken into consideration in order to make a good choice of these stations?

Do you know a good companies that have a reputation in these field?

According to your experience what is the best way to communicate with this type of network?

Answer:

As I interpret your question there will be 20 stations that have real-time gamma radiation measurements. That is the correct (and most cost effective) approach.

In addition to that, there will be a few stations that have alpha and beta radiation radiation measurements. Presumably, that will come from air filter sample measurements. Those results will be gross alpha and gross beta, which will not tell you the isotopic identity of the radioisotope.  This is as it should be.

Ordinarily, these samples would not be subjected to additional analysis by isotopic analysis for the beta emitting radionuclide or Alpha emitting radionuclide due to the expense. However, if there was an elevated gamma result, it would give an indication that there was something present and to help justify the additional analytical expense of actual alpha/beta isotopic.  The air samples themselves can be saved for re-analysis at any time in the near future if justified by anomalous gamma data results that may occur if something out of the ordinary occurs somewhere that you might detect.

The elevated gross gamma will "trigger and guide" whatever investigation that follows.

I cannot recommend any specific vendors that might be available to supply your requirements. There are several out there and they are all competent. The best design for the gross gamma measuring system was that that the Germans showed the RMCC group, that was based on high and low level gamma measuring Geiger Mueller detectors.

During normal operations, penetrating radiation (like gamma rays and x rays) emitted from the radioactive materials in the reactor and in the systems and buildings of the plant are not able to expose someone outside the boundary of the plant. Nevertheless, radiation monitors are placed on the fence line surrounding the site to directly measure any radiation exposure that might occur.

Radioactive materials that could cause radiation exposure near nuclear power plants are generally monitored by sampling air, food, and water supplies for radioactivity content. Radioactive emissions may be released to both air and water. The radioactive material in the air could be breathed in directly or could settle or deposit on local vegetation. Therefore, samples are taken of the air emissions and food products such as garden vegetables. Some radioactive material could also land on pasture grasses that cows eat, so milk and vegetation are sampled. Nuclear power plants near bodies of water are required to check for radioactive material in all nearby lakes, ponds, and streams, so water samples are taken from the liquid waste stream from the plant. Other water samples are taken from the nearest public water supplies. Samples of fish are caught and analyzed as well. The amount of radioactive material allowed to be released from power plants is strictly controlled by the utility and regulated by the Nuclear Regulatory Commission.