Título:	A new pulsed pyroelectric radiation dosimeter.
Autoria:	CARVALHO, A. A. MASCARENHAS, S. PAULA, M. H. de
Afiliação:	UNESP-Campus de Ilha Solteira; EMBRAPA-CNPDIA.
Ano de publicação:	1988
Referência:	In: INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 4., Oct. 1988, São Paulo, SP. Book of abstracts... São Paulo: [s.n.], 1988.
Páginas:	p.II-25.
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 Radiation Pyroelectric Pulsed
Tipo do material:	Resumo em anais e proceedings
Acesso:	openAccess
Aparece nas coleções:	Resumo em anais de congresso (CNPDIA)