Monte Carlo modelling of 90Sr/90Y and 85Kr beta fields for Hp(3) measurements.
Radiat Prot Dosimetry
; 158(1): 115-21, 2014 Jan.
Article
em En
| MEDLINE
| ID: mdl-23945747
ABSTRACT
In support of research aimed at developing a thermoluminescence dosemeter capable of accurately measuring ionising radiation doses to the lens of the eye, Monte Carlo modelling of a standard beta exposure set-up has been performed. It was found that electrons with an energy distribution corresponding to the beta emission spectrum from (85)Kr deposit negligible doses at a depth of 3 mm in tissue, but doses from (90)Sr/(90)Y are significant; free in air and fluence-to-Hp(3,θ°) and -Hp(0.07,θ°) conversion coefficient data were found for this field for exposures at 0°, 30° and 60° angles of incidence, and the response characteristics of the new eye dosemeter were evaluated. It was shown that the results were not affected greatly by the shape of the calibration phantom. However, it was demonstrated that the presence of intermediating air and beam flattening filters hardens the energy distribution of the field at the point of test, relative to a raw (90)Sr/(90)Y source, and this impacts dose depositions.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
1_ASSA2030
Base de dados:
MEDLINE
Assunto principal:
Eficiência Biológica Relativa
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Radioisótopos de Estrôncio
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Radioisótopos de Ítrio
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Radioisótopos de Criptônio
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Método de Monte Carlo
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Modelos Estatísticos
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Olho
Tipo de estudo:
Health_economic_evaluation
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Prognostic_studies
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Risk_factors_studies
Limite:
Humans
Idioma:
En
Revista:
Radiat Prot Dosimetry
Ano de publicação:
2014
Tipo de documento:
Article