Data/hora: 09/06/2024 07:24:31

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 22/12/1999
Data da última atualização: | 09/03/2010
Autoria: | CARVALHO, A. A.; MASCARENHAS, S.; PAULA, M. H. de.
Afiliação: | UNESP-Campus de Ilha Solteira; EMBRAPA-CNPDIA.
Título: | A new pulsed pyroelectric radiation dosimeter.
Ano de publicação: | 1988
Fonte/Imprenta: | In: INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 4., Oct. 1988, São Paulo, SP. Book of abstracts... São Paulo: [s.n.], 1988.
Páginas: | p.II-25.
Idioma: | Inglês
Conteúdo: | We describe a new type of radiation dosimeter for the diagnostic X-ray region using a pyroelectric detector. The pulsed pyroelectric radiation dosimeter (PPERD) is a system constituted by a X-ray beam commutator, a pyroelectric chamber, a pre-amplifier and an electronic peak detector. The pyroelectric chamber consists basically of a lead zirconium titanate (PZT) ceramic (17mm x 17mm and 3mm thick) on a nylon support. The chamber is evacuated to about 1mm Hg. The thickness of the detector is such that it absorbed more than 99% of the X-ray beam used in these studies. The pyroelectric element itself absorbs a X-ray pulse and provides a voltage proportional to the energy absorbed. The PPERD has the following characteristics for diagnostic X-ray beams: 1) it responds linearly to the radiation intensity for a given radiation spectrum; 2) it responds linearly to the radiatin energy fluence rate; 3) the pyroelectric chamber is simple to construct, inexpensive and rugged; 4) the lower detection limit of energy fluence rate range and of exposure rate range are respectively 20mW/m2 and 9,0.10E-6C.KgE-1 sE-1 (35mR/s).
Palavras-Chave: | Dosimeter; Pulsed; Pyroelectric; Radiation.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (5164-1) - UPC - SP - -- - PROCI-88.00001 -  - 1988.00001 - DIS