Abstract:
:Continuous observation of radioactivity ratio of (214)Bi to (214)Pb as tracers in rainwater was carried out with 15-min cyclic measurement at Nagoya, Japan, from August 2011 to July 2012 to characterise wet deposition. The ratio ranged from 0.55 to 3.82. Based on the observation and a simplified time evolution model of (214)Pb and (214)Bi radioactivities during rainwater formation, the 'age' of raindrops ranged from sub-10 to several 100 min. The age would have negative correlation to rainfall intensity, but its variation for lower rainfall intensities was quite large. Secular equilibrium of (214)Pb and (214)Bi radioactivities in cloud water with airborne radon did not hold for some rainfall events.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Moriizumi J,Kondo D,Kojima Y,Liu H,Hirao S,Yamazawa Hdoi
10.1093/rpd/ncv220subject
Has Abstractpub_date
2015-11-01 00:00:00pages
55-8issue
1-3eissn
0144-8420issn
1742-3406pii
ncv220journal_volume
167pub_type
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