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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
09/03/2010 |
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Autoria: |
CARVALHO, A. A.; MASCARENHAS, S.; PAULA, M. H. de. |
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Afiliação: |
UNESP-Campus de Ilha Solteira; EMBRAPA-CNPDIA. |
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Título: |
A new pulsed pyroelectric radiation dosimeter. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
In: INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 4., Oct. 1988, São Paulo, SP. Book of abstracts... São Paulo: [s.n.], 1988. |
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Páginas: |
p.II-25. |
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Idioma: |
Inglês |
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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). |
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Palavras-Chave: |
Dosimeter; Pulsed; Pyroelectric; Radiation. |
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Categoria do assunto: |
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Marc: |
LEADER 01716naa a2200205 a 4500
001 1026547
005 2010-03-09
008 1988 bl --- 0-- u #d
100 1 $aCARVALHO, A. A.
245 $aA new pulsed pyroelectric radiation dosimeter.
260 $c1988
300 $ap.II-25.
520 $aWe 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).
653 $aDosimeter
653 $aPulsed
653 $aPyroelectric
653 $aRadiation
700 1 $aMASCARENHAS, S.
700 1 $aPAULA, M. H. de
773 $tIn: INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS, 4., Oct. 1988, São Paulo, SP. Book of abstracts... São Paulo: [s.n.], 1988.
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Embrapa Instrumentação (CNPDIA) |
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