Formaldehyde increases MAGIC gel dosimeter melting point and sensitivity.
Phys Med Biol
; 53(4): N53-8, 2008 Feb 21.
Article
em En
| MEDLINE
| ID: mdl-18263941
ABSTRACT
Polymeric gel dosimeters are being used to verify three-dimensional (3D) dose distributions of different types of radiotherapy treatments, especially the most complexes ones. An important factor that can limit the wider use of this kind of dosimeter is temperature, as gel melting can destroy 3D information. This work shows that adding formaldehyde to the gel preparation increases the melting point, allowing its use in warmer environments, including up to body temperature. An addition of 3% in mass of the formaldehyde solution to a MAGIC type gel dosimeter increased its melting point from 25 to 69 degrees C. Also important were a 12.5% increase in gel sensitivity and an expressive decrease in relaxation rate R2 uncertainty.
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Base de dados:
MEDLINE
Assunto principal:
Polímeros
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Ácido Ascórbico
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Doses de Radiação
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Sulfato de Cobre
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Temperatura de Transição
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Formaldeído
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Gelatina
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Hidroquinonas
/
Metacrilatos
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article