It has been shown that dominant ^^''Ac impurity in some non highly purified lanthanum Compounds as La(N03)3 x 6H2O or LaaOs, together with its daughters, can be used for efficiency calibration of Ge-detectors in the energy ränge from 50 keV to 1500 keV, using '^'La to determine the ^^^Ac activity. These Compounds are recommended for the calibration of voluminous liquid and powdery samples.A total background count rate in the energy ränge of 20 -2880 keV was 1.6 cps. Spectrometer is coupled to a CANBERRA 8k ADC "MCA 35+" multichannel analyzer which is connected to a HP Vectra ES/12 Computer for gamma-spectra analysis by means of a "MicroSAMPO" Software [2].Measurements of different samples lasted from 60 to 160 ks, while monitoring of the background spectra with much longer expositions was regularly performed between the sample measurements.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.