The magnetic particles in the water-based magnetic uids were sterically stabilized by natrium oleate to prevent their agglomeration and consequently the adsorption of poly-ethylene-glycol (PEG) was carried out to improve the biocompatibility of the magnetic particles. Two sets of samples were prepared. The rst set of the samples was with dierent molar weight of PEG (Mw = 400, 1000, 10 000 and 20 000) at the constant weight ratio of PEG/Fe3O4 = 0.25 and the second one was with dierent weight ratio of PEG/Fe3O4 and constant molar weight of PEG (Mw = 1000). The samples were irradiated with 20 Gy. The same reduction of saturated magnetization (about 10%) after electron irradiation with 20 Gy was observed for all prepared samples.
Many industrial problems require the nondestructive determination of the percentages of chemical elements in samples whose components have very similar physical properties.The present work is an extension of that reported in [1, 2] and tests the possibility of using a stable method of quantitative analysis of multicomponent mixtures based on experimentally determined photoneutron yields.We use the scheme of measuring photoneutron yields on a betatron proposed by O. V. Bogdankevich [3], and the mathematical apparatus for solving certain incorrectly formulated problems first proposed by A. N. Tikhonov [4] and subsequently successfully developed in papers by V. G. Shevchenko et al. for determining photonuclear cross sections.
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