and Zr in glass sand rock samples. The samples and standards were irradiated with a mono-
energetic neutron flux of 10 8 n· cm–· s–1. Pneumatic facility was used. The gamma activities
from samples and standards were counted using a 30 cm 3 Ge (Li) detector, with FWHM of
2.9 keV at 1.332 MeV, coupled to an on-line computer facility.