Calibration technique of clinical dosemeters by components
Description
Constituted by ionization chambers (timble and superficial types) connected to special electrometers, the clinical dosemeters are normally calibrated in 60Co radiation fields as whole systems in relation to a secondary standard. In order to allow the users to send only one of the pieces for recalibration, a very useful procedure for those who own several ionization chambers and only one electrometer, a technique of calibration by components was developed in the present work. A standard capacitor of 1000 pF and a special standard current source, consisting of an ionization chamber and a 90Sr source, were used. The obtained results showed a difference lower than 0,4% between them. In relation to the total calibration method, the calibration presented differences lower than 0,7% for several clinical dosemeters tested. (author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Constituidos por camaras de ionizacao (dos tipos dedal e superficial) conectadas aos respectivos eletrometros, os dosimetros clinicos sao normalmente calibrados em relacao a um sistema padrao secundario, com radiacao gama de 60Co. Neste trabalho, foi empregada a tecnica da calibracao por componentes para atender aos usuarios que possuem diversas camaras de ionizacao e apenas um eletrometro, possibilitando aos mesmos encaminhar somente uma das pecas para recalibracao. Foram utilizados dois sistemas diferentes; o primeiro consistiu no uso de uma capacitor padrao de 1000 pF e o outro no uso de uma fonte de corrente continua de referencia, constituida de uma camara de ionizacao e uma fonte de 90Sr. Os resultados obtidos apresentaram entre si uma diferenca menor que 0,4%. Em relacao ao metodo da calibracao total, a diferenca encontrada foi menor que 0,7% para diversos dosimetros testados. (autor)Files
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Additional details
Additional titles
- Original title (Portuguese)
- Calibracao de dosimetros clinicos por componentes
Publishing Information
- Imprint Pagination
- 14 p.
- Report number
- IPEN-PUB--197
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 20008899
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Descriptors DEI
- CALIBRATION STANDARDS; COBALT 60; DOSEMETERS; ELECTROMETERS; GAMMA SOURCES; IONIZATION CHAMBERS; SSDL
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; COBALT ISOTOPES; ELECTRIC MEASURING INSTRUMENTS; ELECTRICAL EQUIPMENT; EQUIPMENT; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MEASURING INSTRUMENTS; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-ODD NUCLEI; RADIATION DETECTORS; RADIATION SOURCES; RADIOISOTOPES; YEARS LIVING RADIOISOTOPES