Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1979-04-09
1981-05-19
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
G01T 300
Patent
active
042687543
ABSTRACT:
According to the invention, the radioactivation method for simultaneous determination of the nitrogen, phosphorus and potassium content in plants and fertilizers consists in exposing samples to be analyzed and standard samples to neutron irradiation and recording the spectra of the gamma radiation induced in said samples, whereupon the samples are laid aside for a period of time determined by the half-life of the interfering isotope. This is followed by again recording the spectra of the samples being analyzed and of the standard samples and superposing the first and second spectra of the samples being analyzed and of the standard samples. These spectra are then shifted relative to each other along the energy axis, and the contents of the elements being analyzed are determined by thus comparing the spectra of the samples being analyzed and of the standard samples.
REFERENCES:
patent: 3124679 (1964-03-01), Tittman et al.
patent: 4053771 (1977-10-01), Aude et al.
Nadkarni, R. A. and Morrison, G. H., "Multielement Instrumental Neutron Activation Analysis of Biological Materials", Analytical Chemistry, vol. 45, No. 11, (Sep. 1973), pp. 1957-1960.
Kovtun Jury L.
Miroshnikova Nadezhda N.
Saveliev Igor B.
Sidorov Alexandr V.
Srapeniants Rigo A.
Howell Janice A.
Smith Alfred E.
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