Activimeter response behaviour analysis related to well depth
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2016
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INTERNATIONAL CONGRESS OF THE INTERNATIONAL RADIATION PROTECTION ASSOCIATION, 14th
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The activimeter, instrument used to radionuclide activity measure, consist primarily of a well
type ionization chamber coupled to a special electronic device. Its response, after calibration, is shown in
units of the activity quantity (Becquerel or Curie). It also has a special holder designed to accommodate
all kinds of syringes and vials containing the radiopharmaceuticals. Many factors influence the response of
an activimeter such as the volume of the sample, its position inside the activimeter well and the geometry
of the vials. The idea of this study is to find the better position inside the well to get the best activity
values, positioning the holder in different profundity, simulating a clinical procedure. The reference
activimeter used was the Secondary Standard NPL-CRC radionuclide calibrator, traceable to the National
Physical Laboratory (NPL), England, taking as reference the depth of 400 mm. Two other activimeters
were tested: Capintec, CRC-15BT model with the depth of 170 mm and one CRC-25R model with depth of
257 mm. They all belong to the Instrument Calibration Laboratory of IPEN, São Paulo, Brazil. The
measurements were made using three radioactive check sources: Co-57, Ba-133 and Cs-137. Sources
readings were taken at various depths inside the ionization chamber well. The results shown maximum
variation of 14.28% for Co-57, 11.27% to Ba-133 and 8.8% to Cs-137. All measurements were
compared with those values found for the reference depth in each activimeter. The variation found
show the necessity of include this kind of determination in all quality control programs that are applied to
an activimeter used by a Nuclear Medicine Service.
Como referenciar
KUAHARA, LILIAN; CORREA, EDUARDO; POTIENS, MARIA da P. Activimeter response behaviour analysis related to well depth. In: CLEMENT, CHRISTOPHER (ed.); VALENTIN, JACK (ed.); OGINO, HARUYUKI (ed.); FOOTE, DEVON (ed.); REYJAL, JULIE (ed.); OMAR-NAZIR, LAILA (ed.). In: INTERNATIONAL CONGRESS OF THE INTERNATIONAL RADIATION PROTECTION ASSOCIATION, 14th, May 9-13, 2016, Cape Town, South Africa. Abstract... p. 756-756. Disponível em: http://repositorio.ipen.br/handle/123456789/31269. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.