2010, Volume 13, Issue 2
Gamma Radiation Absorption Study on Cryogenic Multilayer Insulation
National Institute for Research and Development for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, Uzinei Street no. 4, P.O. Box Raureni 7, 240050, Ramnicu Valcea, Romania
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-μx
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.
Photon radiation, half-value layer, multilayer insulation.
Tag search Photon radiation half-value layer multilayer insulation