Evaluation of the mixture KNOsub(3)MnOsub(2) for radiation processing dosimetry
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2004
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INTERNATIONAL RADIATION PROTECTION DOSIMETRY ASSOCIATION, 11th
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The radiolysis of the inorganic nitrates has been shown to be complex, undergoing decomposition
when exposed to gamma radiation, producing NO-2 and 02. The radiation dose is absorbed by all components
present in the system, including the added substances. This mechanism has been investigated by several
researchers and for different mixtures. In the present study mixtures of inorganic compounds were prepared in
pellet form and its properties were evaluated by means of spectrophotometric techniques for high doses
assessment. Compounds such as Ba(NO3)2, KBr and Mn02were mixed at the pure KNO 3 . The mixtures were
cold pressed and sealed in polyethylene films. The dosimetric properties were evaluated related to the changes of
the optical response when the pellets are exposed to gamma radiation, in the dose range between 200 and
600 kGy. The mixture containing Mn02 is the only one that presents reduction in the nitrites production rate and,
consequently, larger doses can be measured before the saturation. The characteristics studied were absorption
spectrum and signal stability of irradiated and non-irradiated detectors; batch reproducibility; effect of the
environmental conditions and dose-response useful range. The pellets irradiated with gamma doses present the
maximum wavelengths at 540 mn. The batch reproducibility is better than 98% (16). To maintain their
properties the pellets should be sealed in polyethylene films and stored in ambient with low humidity. Ambient
temperature between 10 and 35°C and ambient light don't affect the optical response. The obtained results
indicate that this type of dosimeter can be used in radiation process applying doses from 200 to 600 kGy.
Como referenciar
GALANTE, A.M.S.; CAMPOS, L.L. Evaluation of the mixture KNOsub(3)MnOsub(2) for radiation processing dosimetry. In: INTERNATIONAL RADIATION PROTECTION DOSIMETRY ASSOCIATION, 11th, May 23-28, 2004, Madrid, Spain. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/15589. Acesso em: 15 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.