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Bi, L. ; Tschiersch, J. ; Meisenberg, O. ; Wielunski, M. ; Li, J.L.* ; Shang, B.*

Development of a new thoron progeny detector based on SSNTD and the collection by an electric field.

Radiat. Prot. Dosim. 145, 288-294 (2011)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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The importance of (220)Rn (thoron) progeny for human exposure has been widely recognised in the past decades. Since no stable equilibrium factor was found between indoor thoron and its progeny, and the concentration of thoron progeny varies with time, it is necessary to develop detectors for long-term measurement that directly sample and detect thoron progeny. However, power supply of this kind of detectors has always been a problem. In this study, a set of device that is suitable for long-term measurement is introduced. A high-voltage electric field was formed for the collection of charged aerosols attached by (222)Rn (radon) and thoron progenies on solid-state nuclear track detector. Impact from radon progeny could be eliminated with a shield of Al foil of appropriate thickness. Tests were made both in an experimental house and in a thoron chamber in Helmholtz Zentrum München to determine the parameters and to verify the universality under different conditions.

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