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AbstractAbstract
[en] Two parallel-plate ionization chambers with circular form, projected and manufactured at Instituto de Pesquisas Energeticas e Nucleares, Brazil, for low energy X-radiation, differ only in the collecting electrode and guard-ring materials: in one of them it is of graphite and in the other one, of aluminium. The great difference in their energy dependences allowed the formation of a Tandem system, that showed its ability in determining the effective energy (or HVL) and exposure rate of unknown X-radiation beams between 6 and 138 KeV, not requiring any absorbers or any special set-ups. (author)
[pt]
Duas camaras de ionizacao de placas paralelas de forma circular foram projetadas e fabricadas no Instituto de Pesquisas Energeticas e Nucleares, para raios-X de baixa energia, diferindo somente no eletrodo de coleta e materiais do anel de protecao: em um deles e de grafite e no outro e de aluminio. A grande diferenca em suas dependencias de energia permite a formacao de um sistema Tandem, que mostrou sua habilidade na determinacao da energia efetiva (ou HVL) e taxa de exposicao de feixes de raios-X desconhecidos, entre 6 e 138 KeV, nao precisando de absorvedores ou qualquer instalacao especial. (M.C.K.)Source
1990; 16 p
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