Data/hora: 09/06/2024 13:39:14

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