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    STUDIA PHYSICA - Ediţia nr.2 din 2012  
         
  Articol:   63Cu(n,γ) 64Cu NUCLEAR REACTION CROSS-SECTION MEASUREMENT AT THERMAL NEUTRONS USING ISOTOPIC NEUTRON SOURCES FOR 64Cu PRODUCTION.

Autori:  LAURA DARABAN, C. COSMA. 		 
       
         
  Rezumat:   The nuclear reaction 63Cu(n,g)64Cu was applied by irradiation with thermal neutrons in order to obtain the b+ emitter radioisotope 64Cu (T1/2 = 12.7 h), used for medical applications in P.E.T. The irradiation block contains 2 isotopic neutron sources type 241Am-9Be and 239Pu-9Be, inserted in paraffin with a fluence of 6.6•107 n/s. The thermal neutron cross-section was determined from over the thermal neutron spectrum using the activation method. In order to calculate the yield of the reaction, simultaneously the thermal neutron flux was monitorized by using some foils of Au, based on the nuclear reaction 197Au(n,g)198Au and using cadmium filters in order to limit the thermal neutron spectrum. The calibration in efficiency of the HPGe detector was made by manufacturing some standard sources of ThO2 with the same size as the irradiated samples, according to a new method. In conclusion, we can produce 64Cu to be used for the P.E.T. application, by using a high flux of thermal neutrons at the nuclear reactor, having enough time to transport it to the clinics.

Keywords: thermal neutrons, cross section, Cu-64, positron emission.
 
         
     
         
         
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