Investigation of the identification of irradiated shrimps and codfish (in French)
From international colloquium: the identification of irradiated foodstuffs; Karlsruhe, Germany (24 Oct 1973). Type Crangon vulgaris shrimps were irradiated with 100, 250 and 500 krad of gamma rays several hours after the catch. It was found that, although spectropolarimetry given lower optical rotation values after irradiation, it can only be used for comparative studies. A distlnction between irradiated and nonirradiated shrimps can only be made by taking infrared spectra readings, as the effect of irradiation is to lower the absorption peak at 3.40 microns and to eliminate it at 3.43 microns. The limit for detection seems to be around 100 krad. In regard to codfish irradiated with doses of 100, 200, and 500 krad, differences from the control sample could not be detected either by infrared light or by spectropolarimetry. Where part of the fish packaging consists of polystyrene, the difference in infrared spectra is shown by a wide and very clearly defined absorption spectrum at the level of 500 krad, this being the minimum level at which it can be detected. (GE)
- Research Organization:
- Ministere des Affaires Economiques, Brussels
- NSA Number:
- NSA-29-018553
- OSTI ID:
- 4342515
- Resource Relation:
- Conference: International colloquium: the identification of irradiated foodstuffs, Karlsruhe, Germany, 24 Oct 1973; Other Information: Orig. Receipt Date: 30-JUN-74; Bib. Info. Source: GE (GE)
- Country of Publication:
- Germany
- Language:
- French
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