Use of a dual sample-biaxial rotating assembly with a pneumatic tube transfer system for high precision 14-Mev. neutron activation analysis

Use of a 60-Mev. linac for fast and variable-energy neutron activation analysis

“…The relative standard deviation given for the activation analysis data is ±10%. there is much room for improvement, for instance, none othe improvements worked out by the NBS group for fastf neutron activation analysis (7,8) have been used. At present, the detection limit for the fluorine determination for our method is 0.05% when one-gram sample is used.…”

Nucleonics

“…The use of fast neutrons for in vivo activation analysis has evolved from a bizarre curiosity to a widely accepted and practiced method during this period (44-, 45,143). The chronic uncertainties of 14-MeV neutron bombardment were exhaustively studied at the National Bureau of Standards; in particular, blank problems (140) and systematic errors (139) were investigated and a device proposed for high-precision analysis (127). Absolute determination of 14-MeV neutron yields, so important for intercomparison of facilities, was also evaluated (73).…”

Activation analysis section :

“…The flux profiles obtained were used to define optimum moderator thickness for both moderators. Using this optimum thickness, measurements were made at the sample positions in our dual sample-biaxial rotating irradiation assembly [39] using gold and yttrium samples for the determination of slow (<0.l4 eV) and fast (>1 MeV) neutron fluxes respectively.…”