1. Federal University of Pernambuco (UFPE), Recife, Brazil
2. National Nuclear Energy Commission (CNEN/CRCN-NE), Recife, Brazil
3. Departamento de Física, Federal University of Sergipe (UFS), São Cristóvão, Brazil
4. Scients, Igarassu, Brazil
5. New York Institute of Technology, Vancouver, Canada