[en] In organic samples there are interfering secondary reactions due to their hydrogen, oxygen and carbon contents in the case of fast-neutron activation analysis which is the most suitable nuclear method for nondestructive determination of nitrogen in various matrices. The yields of these reactions have been studied in a wide range of O/H and C/H ratios. Irradiations were performed with 14.5 MeV neutrons. The induced N-13 activity was measured with a Ge(Li) detector. Cellulose nitrate foils served as flux monitors. (T.I.)

[en] 14 MeV neutron activation analysis and radiochemical separation technique were used for the determination of Cu in Hungarian minerals. The separation of Cu from other elements made it possible to avoid the interferences in the 511 keV γ-line. (author)

[en] Determination of neutron fluence in the body sometimes includes the use of dissolved material in a water phantom as one component of a set of neutron activation detectors. To estimate the perturbation of the neutron field caused by the dissolved detector materials, macroscopic removal cross sections of 14.7 MeV neutrons were measured for a water phantom. Data obtained by using the ⁶³Cu(n, 2n) ⁶²Cu reaction were compared with the calculated values. Results show that the removal cross sections of the primary fast neutrons for water and solutions are the same within the limits of error of the measurements for the usual concentrations (10-20 g.l^-1) of the detector materials. (author)

[en] For a non-destructive determination of the protein content in soya bean samples, 14-MeV neutron activation analysis was applied. To check the method, the results obtained by X-ray fluorescence analysis and the Kjeldahl procedure were compared. For pressed pellet samples of about 1 g with 15 min irradiation and 10 min measuring times the accuracy of the protein determination was found to be 15%. (author) 7 refs.; 4 figs.; 3 tabs

[en] Ta impurities in Nb samples have been determined by X-rays in 14 MeV neutron activation analysis. For X-ray detection, (HP)Ge detector with Be-window is used. The sensitivity of the determination has been found to be about 30 μg (in Nb). (author) 12 refs.; 1 fig.; 2 tabs

[en] Neutron reflection method has been used for the determination of zeolite content in minerals. The basis of this measurement is to observe the large difference between the water content of zeolite and that of other mineralic parts of the sample. The method suggested can be used in a zeolite mine for measuring the zeolite content continuously and controlling the quality of the end products. (author) 5 refs.; 3 figs.; 3 tabs

[en] A method based on a combination of physical integration and activation threshold detectors was developed to determine the volume averaged dose equivalent rates produced by 14.1 MeV incident neutrons in a water filled phantom. To obtain the spectral fluence of neutrons in phantoms activation threshold detector measurements and a least-squares unfolding code (LSQ) were used. The physical integration was carried out by stirring the phantom solution after irradiation. The method is suitable also to determine the energy averaged conversion factor between the maximum dose equivalent and the primary fast neutron fluence measured on the surface of the phantom. The method proposed can be applied for any kind of phantom geometry. (orig.)

[en] Neutron transmission method was used for the determination of boron in borosilicate glasses. The method is sensitive and rapid to control the spatial homogeneities of glass-product in the melting furnace. (author) 5 refs.; 2 figs.; 3 tabs

[en] A system was designed for the determination and discrimination of ingredients in an automatic transport and measuring system of a plastics factory. The materials are discriminated on the basis of their different average atomic weight, which is measured by X-ray fluorescence analysis. The materials of low atomic weight are separated on the basis of their different specific weight measured by the attenuation of X-rays. The system is fully automated. (D.Gy.)

[en] The X-ray fluorescence method was introduced to measure the weight of an Nb monitor used for the neutron fluence measurement via the ⁹³Nb(n,n')^93mNb reaction in a fission reactor. Results were compared with those obtained by γ-spectrometry based on the ⁹³Nb(n,γ)⁹⁴Nb reaction. For comparison, the specific activities of ^93mNb measured in two different laboratories are also given. (author)