RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
A New Dustmonitor for Measurement of Artificial Beta Aerosol Activity Concentration in Real Time
Masaki OONISHI, Hironobu HAYAKAWA
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Keywords: dust monitor, radon, thoron, alpha activity, beta activity, efficiency, real time
JOURNAL FREE ACCESS

1990 Volume 39 Issue 10 Pages 453-456

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Abstract
We have designed a new dust monitor that takes of advantage certain physical relationship that exist between the alpha and beta emissions of the radon and thoron progeny. This dust monitor is able to simultaneously measurement both alpha and beta activity while sampling.The counting efficiencies are 9 % and 14 % respectively. On May 1986, the monitor detected the Chernobyl radioactivity in real time.
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© Japan Radioisotope Association
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