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Information × Registration Number 0308U001426, 0106U003137 , R & D reports Title Nuclear-physics and nanotechnological methods of solving the problems of radioactive waste and of the element determination in biological samples popup.stage_title Визначення вмісту Са, І та ізотопних відношень Са в зразках Head Dupliy Stepan Anatoliyovich; Fedorec Ivan Dmitrovich, Registration Date 04-02-2008 Organization Kharkov national university named after V.N. Karazin popup.description2 Results of the application of photon activation method to the determination of element content in child's hear depending on age, sex and some somatic diseases are presented. The hair samples by weight about 1g each of have been collected from 203 pupils (93 male and 110 female, age range 9-16 y) from one of the suburban schools and were irradiated by the bremsstrahlung using the 700 mA, 25 MeV electron beam from the high-power electron accelerator. The detection limit was ranged from 10-5 % mass (for Ca and Pb) to 10-7 % mass (for I). Within the present context, serious consideration has been paid to studies of the analytical scope of this method. It has been shown that with suitable development of experimental techniques, photon activation method can be applied with advantage not only for analysis of biological materials but also and for revealing and research of prepatological conditions of biological systems. The construction of an ion pulse ionization chamber aimed at measuring levels of surface alpha-activity of different samples is described. Created on a basis the ionization chamber the low-background spectrometer together with corresponding methods of registration and processing of signals allows to achieve high sensitivity of direct measurements of midget levels of superficial alpha-activity. Allows to solve a problem of the control of superpure materials, with the broken balance in a circuit of disintegrations of the uranium and thorium decay chains. The results of modeling of pulses of a current are with depending on orientation and site of tracks of alpha-particles in the chamber are given. The results of measurement carried out with alpha-source, and also with copper samples, stainless steel and light-reflecting film VM2000 are presented. Product Description popup.authors popup.nrat_date 2020-04-02 Close