Abstract
Abstract A new analytical approach is presented for the calculation of full-energy peak (FEP) efficiency of NaI (Tl) detectors. The self-attenuation of the parallelepiped source matrix, the attenuation by the source container, and the detector housing materials were considered in the mathematical treatment. The efficiency values calculated using the presently suggested analytical approach are compared with those measured values obtained by two different sizes of NaI (Tl) detectors. The calculated and the measured full-energy peak efficiency values were in a good agreement.
Highlights
Magnetic nanomaterials are drawing increased attention due to their remarkable physical properties
Theoretical calculations were compared with experimental results obtained from M(H) measurements
The values of the polydispersity index confirm the monodispersity Polyvinylidene fluoride (PVDF) ?Fe3O4 nanocomposites system. This shows that the size distribution of Fe3O4 particles in polymer matrix is fairly good and can be described by a lognormal distribution function: f ðxÞ 1⁄4 pffiffiffiffi1ffi Á exp 2pr Á x
Summary
Magnetic nanomaterials are drawing increased attention due to their remarkable physical properties. The combination of different materials allows to make completely new composite materials with a wide range of functional properties: mechanical, chemical, electrical, magnetic, optical and many others [3]. The formation of unique properties of polymer-based magnetic nanocomposites depends on many factors such as particles size and shape, degree of dispersion, concentration. The determination of the size of the Fe3O4 nanoparticles before and after their introduction into the polymer matrix has been investigated in our early works [4]. The change in nanoparticle size depends on the type of polymer
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