According to the laws and regulations in force in the of nuclear energy, nuclear power plants operators are required to maintain a strict control over the level of radiation exposure of the personnel working near the  reactors, so to keep the exposure into the limitations imposed.  
    MATE-FIN, in co-operation with the Canadian company KINECTRICS Inc., conducts monitoring and surveillance of gamma radioactivity in the vicinity of nuclear reactors; this activity is performed during the annual outages of the reactors.
   Investigations, consisting of spectroscopic measurements of gamma radiation fields around components of interest, generates an important database, which are subsequently analyzed and interpreted.
     The primary objective of this investigation is to identify the responsible radio-nuclides for the observed radiation fields, their specific activities and their contribution to the radiation fields.
     The final results of investigations and of data analysis and interpretation, are used both, to elaborate 3D models of radiation fields and to prepare analyzes of fields trends and diagnostics. Together, they constitute the decisive elements for the development of short and long term strategies to maintain the radiation exposure of the working personnel, to such low values as it is reasonable to be achieved, according to the requirements imposed by ALARA.
   Using these data, estimates can be made, over the contribution of each component dose in the observed radiation fields in locations of interest, simulations of working procedures in radiation fields can be performed, in order to optimize these procedures, to train the personnel and to better plan the activities, performances of shielding can be improved and the exposure durations of personnel can be reduced.   
    Monitoring and surveillance of gamma radiation fields, provides an essential database for their comprehensive and complete interpretation.
   The information on the radio-nuclides generating radiation fields are very useful in predicting the efficacy of technologies to reduce the radiation sources. This database is needed to optimize the shielding methods and procedures, in order to reduce the radiation doses for the working personnel.
    Using the obtained data, consistent comparisons can be made, between gamma radiation fields around various reactor components from different reactors and from different nuclear power plants.       
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