Thermoluminescence Analysis for Detection of Irradiated Food—Luminescence Characteristics of Minerals for Different Types of Radiation and Radiation Doses

Thermoluminescence analysis is used to detect radiation processing of foods which are contaminated with sand or dust. Silicate minerals are isolated, their radiation-induced luminescence is measured and compared to the thermoluminescence from a second measurement after exposure to a defined radiatio...

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Bibliographic Details
Published in:Food science & technology 2000-01, Vol.33 (6), p.431-439
Main Authors: Soika, Christiane, Delincée, Henry
Format: Article
Language:English
Subjects:
ALIMENTOS IRRADIADOS
Biological and medical sciences
Food engineering
Food industries
food irradiation
Fundamental and applied biological sciences. Psychology
General aspects
IRRADIACION
IRRADIATED FOODS
IRRADIATION
irradiation identification
OPTICAL PROPERTIES
PRODUIT ALIMENTAIRE IRRADIE
PROPIEDADES OPTICAS
PROPRIETE OPTIQUE
SILICA
silicate minerals
SILICE
thermoluminescence
type of radiation
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Summary:Thermoluminescence analysis is used to detect radiation processing of foods which are contaminated with sand or dust. Silicate minerals are isolated, their radiation-induced luminescence is measured and compared to the thermoluminescence from a second measurement after exposure to a defined radiation dose (normalization). In the present study, the mineral mixture ‘sand’ and its main components feldspar and quartz were investigated for their thermoluminescence behaviour using different types of radiation, in order to determine adequate radiation sources for the purpose of normalization. The material was irradiated with types of ionizing radiation commonly used for commercial food irradiation, i.e. accelerated electrons with beam energies of 5 MeV as well as 10 MeV, and60Co- γ -rays. After thermoluminescence measurements, samples were re-irradiated using either accelerated electrons with beam energies of 2 MeV, 5 MeV or 10 MeV, or60Co- γ -rays,90Sr- β -rays or ultraviolet rays (200–280 nm). Evaluation of the first and corresponding second glow curve revealed that their shapes depend on the type of minerals in the mixture. The second radiation treatment (normalization) is satisfactory when accelerated electrons (2, 5 and 10 MeV) as well as60Co-γ -rays and90Sr- β -rays are employed. Normalization with ultraviolet rays, however, has only a limited range of use.
ISSN:0023-6438
1096-1127
DOI:10.1006/fstl.2000.0683