Abstract:
:A new method was developed to determine HT deposition velocity and to investigate how environmental factors affect the deposition processes including the diffusion into soil and the biochemical conversion by microorganisms to HTO in soil. This method, using a chamber and two tritium samplers, enables determination of the HT deposition velocity in situ without a large scale experiment and an additional tritium source. The main problem concerning the use of a flow-through method is the possible effect of flow rate on flux measurement. Since the tritium sampler used in this study has many collecting columns, the flow rate is limited. Experimental results showed no significant effect of flow rate over a low range from 0.48 to 0.95 l.min-1. From the increase of HT deposition velocity with increase of water content, it was indicated that biochemical oxidation rather than physical diffusion dominantly affects the HT deposition velocity under examined site conditions. No clear relationship between the HT deposition velocity and atmospheric temperature, relative humidity or soil temperature was observed. The soil temperature was only of secondary importance as a factor controlling the HT deposition velocity.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Koarashi J,Amano H,Andoh M,Iida T,Koma Tdoi
10.1093/oxfordjournals.rpd.a006435keywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
237-43issue
3eissn
0144-8420issn
1742-3406journal_volume
93pub_type
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