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FRESH FISSION PRODUCT [1 record]

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Record 1 2007-04-25

English

Subject field(s)
  • Nuclear Science and Technology
  • Nuclear Physics
CONT

There are more than 20 radioactive isotopes of iodine. Some very important radioisotopes are found in industry and medicine. I-131 is the dominant radioisotope contributing to internal exposure after a reactor accident, nuclear weapons test or any incident involving fresh fission products. However, short-lived radioisotopes I-132, I-133, I-134, I-135 with half-lives from 52 minutes to 6. 7 hours can contribute significantly if the person is in close proximity to a fresh fission product release.

French

Domaine(s)
  • Sciences et techniques nucléaires
  • Physique nucléaire
CONT

Des exemples de produits de fission à très courte vie sont le xénon-135 (de période 8 heures) et l'iode-131 (de période 8 jours). Le premier est un poison pour la bonne marche du réacteur s'il s'accumule en trop grande quantité. Le second a fait partie des produits de fission frais qui ont été relâchés lors de l'accident de Tchernobyl. Cet élément très mobile (il est volatil) et radioactif a constitué le principal danger immédiatement après l'accident.

CONT

On a vu au contraire une augmentation des cancers et des nodules thyroïdiens chez les habitants des îles Marshall après le tir «Bravo» de Bikini. Ces habitants avaient reçu des produits de fission frais.

Spanish

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