Relative depth-doses from square and rectangular Y-90 beta applicators used in skin cancer therapy
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| Format: | Artículo científico |
| Language: | pt |
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Sociedade Brasileira de Proteção Radiológica - SBPR
2020
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| _version_ | 1876484283318665216 |
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| author | Eduardo De Paiva |
| author_facet | Eduardo De Paiva |
| contents | Relative depth-doses from square and rectangular Y-90 beta applicators used in skin cancer therapy Eduardo De Paiva Biología beta 90 applicator beta particles relative depth dose calculation Plaques containing beta-emitting isotopes have several medical applications. In particular, due to the short range of beta particles and the rapid fall off of dose rates they are suitable to be used in small and superficial skin cancer therapy, killing the tumor cells and preserving the underlying healthy structures. The analytical/numerical beta-point dose function formalism is used to a simple estimate of the relative dose rates around square and rectangular beta applicator containing the Yttrium-90 isotope. Maximum differences in relative dose rates along central axis of 13% at 6.6 mm depth and 20% at 5 mm depth were found, respectively, for the square and rectangular plaques as compared to the literature measurements data. Results have also indicated that for both plaques dose rates fall off to 50% of the reference value at about 2 mm depth; drop to just 10% at 4.5 mm depth and become zero from 8 mm on. This fact confirms that these sources are suitable to be used in superficial skin cancer therapy. The method presented here may be used to estimate the relative dose rates around square and rectangular Y-90 beta applicators in a simple and fast way. 2020 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280905010 pt http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2 Vol.8 |
| format | Artículo científico |
| id | redalyc_722280905010 |
| institution | Redalyc |
| language | pt |
| publishDate | 2020 |
| publisher | Sociedade Brasileira de Proteção Radiológica - SBPR |
| spellingShingle | Relative depth-doses from square and rectangular Y-90 beta applicators used in skin cancer therapy Eduardo De Paiva Biología beta 90 applicator beta particles relative depth dose calculation Relative depth-doses from square and rectangular Y-90 beta applicators used in skin cancer therapy Eduardo De Paiva Biología beta 90 applicator beta particles relative depth dose calculation Plaques containing beta-emitting isotopes have several medical applications. In particular, due to the short range of beta particles and the rapid fall off of dose rates they are suitable to be used in small and superficial skin cancer therapy, killing the tumor cells and preserving the underlying healthy structures. The analytical/numerical beta-point dose function formalism is used to a simple estimate of the relative dose rates around square and rectangular beta applicator containing the Yttrium-90 isotope. Maximum differences in relative dose rates along central axis of 13% at 6.6 mm depth and 20% at 5 mm depth were found, respectively, for the square and rectangular plaques as compared to the literature measurements data. Results have also indicated that for both plaques dose rates fall off to 50% of the reference value at about 2 mm depth; drop to just 10% at 4.5 mm depth and become zero from 8 mm on. This fact confirms that these sources are suitable to be used in superficial skin cancer therapy. The method presented here may be used to estimate the relative dose rates around square and rectangular Y-90 beta applicators in a simple and fast way. 2020 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280905010 pt http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2 Vol.8 |
| title | Relative depth-doses from square and rectangular Y-90 beta applicators used in skin cancer therapy |
| topic | Biología beta 90 applicator beta particles relative depth dose calculation |
| url | https://www.redalyc.org/articulo.oa?id=722280905010 |