Abstract By applying the standard technique of co-precipitation of ferric- and ferrous salts with ammonium hydroxide in an inert atmosphere, the magnetite nano-crystallites have been prepared labelled with Auger- and internal conversion electrons, beta- and alpha-emitters (57Co, 60Co and 241Am radionuclides). It has been confirmed by the methods of both X-ray phase analysis and Absorption Mossbauer Spectroscopy that for both cases (the “pure” crystallite and the ones doped with radionuclides), it is nanoparticles of a spherical shape that were synthesized with a magnetite structure and crystallites with a diameter of 12–18 nm; there were no admixtures of other iron compounds detected. It has been shown that the governing stabilization factor for the daughter iron atoms that were produced in 57Co(II) as a result of electron capture (EC) is the size of the atom whose position is originally occupied by the parent atom: in the emission spectra there are only Fe2+-species “present”. A comparative analysis has been conducted of radiation-induced damage patterns in nano-crystallites in the dependence of nuclear- and physical characteristics of the radioactive tracer and total fluence. It has been established that under irradiation there is a comminution of crystallites taking place, the effective magnetic fields on the iron atoms in the labelled nano-crystallites remaining unchanged irrespective of the “dose load”. Resulting from the decay of 241Am, the daughter nucleus receives the energy of 92.3 keV, the range of 237Np nuclei (while the account is taken of the entire cascade of possible collisions) amounting to almost 40 nm, which is twice the size of “nano-containers” (the escape of 237Np from the volume of crystallites is experimentally confirmed by the method of 2πα-counting).

中文翻译：

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用俄歇和内部转换电子发射体、α 和β 衰变放射性核素标记的磁铁矿纳米晶体中放射性衰变的后效应

摘要 通过在惰性气氛中应用三价铁盐和亚铁盐与氢氧化铵共沉淀的标准技术，制备了带有俄歇电子和内转换电子、β-和α-发射体 (57Co, 60Co 和 241Am 放射性核素）。通过 X 射线相分析和吸收穆斯堡尔光谱的方法已经证实，对于这两种情况（“纯”微晶和掺杂放射性核素的微晶），它是由磁铁矿结构合成的球形纳米颗粒和直径为 12-18 nm 的微晶；没有检测到其他铁化合物的混合物。已经表明，由于电子捕获 (EC) 在 57Co(II) 中产生的子代铁原子的控制稳定因子是其位置最初被母原子占据的原子的大小：在发射中光谱中只有 Fe2+ 物种“存在”。根据放射性示踪剂的核特性和物理特性以及总通量，对纳米微晶中的辐射诱导损伤模式进行了比较分析。已经确定，在辐照下发生微晶粉碎，无论“剂量负荷”如何，标记纳米微晶中铁原子上的有效磁场都保持不变。由于 241Am 的衰变，子核接收到 92.3 keV 的能量，