Progress of Cryogenics and Isotopes Separation

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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.
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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

 

 

ABSTRACT

 

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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