Consulta: subjectFacets:"Dosimetry"
Registros recuperados: 3
Data/hora: 10/06/2024 10:25:06

Activities, procedures and doses in pediatric patients due to radiopharmaceuticals
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Oliveira,Silvia Maria Velasques de; Boasquevisque,Edson Mendes; Santos,Felipe Sima dos; Biancardi,Rodrigo.
An investigation performed between 2003 and 2005 in sixteen selected public and private institutions in Northeast, Southeast and South geographical regions of Brazil evaluated average organ doses and effective doses in 2,411 pediatric patients due to diagnostic procedures with radiopharmaceuticals. For 1 year, effective doses were greater than literature. For 5 years, differences were noticed between present work and literature for bone scintigraphy, thyroid scintigraphy and 67Ga citrate scintigraphy. These differences may be attributed to the uncertainties in internal dose calculations. High absorved doses in bone surfaces of children due to 67Ga citrate and bone scintigraphy should be evaluated accordingly. Current protocols used recommend standardized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pediatrics; Oncology; Dosimetry; Radiopharmaceuticals; Nuclear medicine; Radiation protection.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000700019

Radiation exposure in nuclear medicine: real-time measurement
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Sylvain,Iara; Bok,Bernard.
French regulations have introduced the use of electronic dosimeters for personal monitoring of workers. In order to evaluate the exposure from diagnostic procedures to nuclear medicine staff, individual whole-body doses were measured daily with electronic (digital) personal dosimeters during 20 consecutive weeks and correlated with the work load of each day. Personal doses remained always below 20 µSv/d under normal working conditions. Radiation exposure levels were highest to tech staff, nurses and stretcher-bearers. The extrapolated annual cumulative doses for all staff remained less than 10 % of the maximum legal limit for exposed workers (2 mSv/yr). Electronic dosimeters are not technically justified for routine survey of staff. The high sensitivity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dosimetry; Exposure; Electronic dosimeters; Personal monitoring; Equivalent dose.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000500015

Biological X-ray irradiator characterization for use with small animals and cells
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Bruno,A. Colello; Mazaro,S.J.; Amaral,L.L.; Rego,E.M.; Oliveira,H.F.; Pavoni,J.F.
This study presents the characterization of an X-ray irradiator through dosimetric tests, which confirms the actual dose rate that small animals and cells will be exposed to during radiobiological experiments. We evaluated the linearity, consistency, repeatability, and dose distribution in the positions in which the animals or cells are placed during irradiation. In addition, we evaluated the performance of the X-ray tube (voltage and tube operating current), the radiometric survey (leakage radiation) and safety devices. The irradiator default setting was established as 160 kV and 25 mA. Tests showed that the dose rate was linear overtime (R2=1) and remained stable for long (constant) and short (repeatability) intervals between readings. The mean dose rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X-ray irradiator; Dosimetric characterization; Radiotherapy; Dosimetry; Radiochromic film.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000300607