The organization of the INAA laboratory at the Interfaculty Reactor Institute at Delft, The Netherlands, has been brought in accordance with the requirements of Euronorm EN45001 and ISO guide 25 for quality systems. Procedures, techniques and instructions involved in routine INAA have been fully described and documented, and compiled in a quality manual. The implementation of such a quality system and of its accreditation for an INAA laboratory in a university environment are discussed.
The use of activable tracers for industrial applications proved to be a favorable alternative to the use of radiotracers in
a number of cases. Difficulties belonging to the procedure to obtain the permit for handling radioactive materials by public
health authorities are avoided: delay in time and details of the processes involved open to the public. Economic advantages
of activable tracers are low cost of activable tracers and absence of labor costs for radiological control. Three examples
are given: a mixing process, material losses by a stack and wear measurements.
The leak-rate of Ar through seals of liquid sodium pumps for sodium-cooled fast reactors is measured by thermal neutron activation
analysis of oil and air samples taken from the cooling and lubrication systems of the seals. A method to calculate the leak-rate
through a triple seal from the increase of the Ar concentrations is given.
The detection of “plated” specimens (ancient falsifications consisting of a copper core with a silver outer layer) amidst
a great collection of silver coins was performed by non-destructive neutron analysis. The “plating” can be detected by measuring
the Ag/Cu ratio. In practice it is more convenient to determine the Au/Cu ratio which is proportional to it, A short activation
in a low thermal neutron flux is sufficient for this purpose. Consequently the induced activity of the long-lived110mAg is small. The necessary correction for self-absorption on the measured ratio is small. A series of 2000 coins was analysed
in this way.