Progress of Cryogenics and Isotopes Separation


The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.


gamma radiation absorption study on cryogenic multilayer insulation



Sorin Gherghinescu*


National Research and Development Institute for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, code 240050 - Rm. Valcea, Uzinei 4, CP7 Riureni, Valcea, Romania, phone:0040 250  736979, fax:0040 250 732746





Photon radiation is a high energy flow, resulting from the radioactive decay of nuclei. When passing through a substance, γ radiation interacts with atomic nuclei, with free electrons and bound electrons. Phenomena that can occur from these interactions are:

- Photoelectric effect

- Compton effect

- Generation of electron-positron pairs.

They have the effect of initial γ radiation attenuation. The degree of attenuation of radiation intensity depends on the nature of the γ radiation and crossed the absorbent layer. Law of variation of γ radiation intensity is thick substance:

I = I0e-mx


where: I - intensity of initial radiation, I - intensity of radiation that passed through the layer of substance, x - thickness of the absorbing substance, μ- radiation absorption coefficient of the substance.

Paper aims to determine the half-value layer (HVL) of the few materials that can be used in multilayer insulation, compared with other material properties for effective application in different temperature conditions.


KEYWORDS: Photon radiation, half-value layer, multilayer insulation

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