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Type: Artigo de evento
Title: Measurement Of Indoor 222rn Using Cr-39 Under A Thin Film Geometry
Author: Neman R.S.
Schmitman I.D.
Hadler N.J.C.
Iunes P.J.
Paulo S.R.
Guedes S.
Abstract: In this work an assembly for indoor 222Rn measurement is presented. This assembly is made up of two acrylic plates (14 cm×14 cm) separated by a distance of 4 mm. To prevent radon daughters from outside entering the assembly (and produce alpha particle tracks striking the CR-39 detector placed in the central region of one of these plates), the borders of these plates were progressively closed, leaving open only a rectangular aperture of 5 mm×4 mm. The size of this opening was determined experimentally, by exposing in two indoor environments assemblies with different apertures as follows: (i) all borders open; (ii) two borders closed; (iii) three borders closed; (iv) four borders closed but one containing a 6 cm×4 mm opening; (v) four borders closed but one containing a 2.5 cm×4 mm opening and (vi) four borders closed but one containing a 0.5 cm×4 mm opening. Track density shows a noticeable decrease between assembly (i) and assembly (iii), remaining constant for smaller openings. Only 222Rn, a noble gas, should enter the assembly independently of the opening size. © 2001 Elsevier Science Ltd. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S1350-4487(01)00140-8
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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