2012 Vol.61 No.10 1/1001/2002011
7020123272
distribution in components, removal percentage
1.

RO
RO2.5
RO
1/2002011
Concentrations were corrected to each sampling date
Samphng date
Concentration,Bq kg'1-dry
tans were collected(27 March

cm102cm5cm5
201271g3.6×10-3
±3
on 28 March 2011
RADIOISOTOPES
Percentagedlstrlbutlonsof137Csin
28 March 2011
inldhorsetailcomponentscollectedin
infieldhorsetailcomponentscoectedin
March2012(n=3)
Fig.3 Distribution percentages of wet weight,137Cs and 4oK contents in field horsetail compart-
mentscollectedin2011and2012.

8.1±1.0 Bq kg-1-raw 4oK
198±24 Bq kg-1-raw 285±18
Bq kg‾1-raw
137Cs4oK
tor


horsetajl(stem)by bomng, and weight ratiobefore (B)
and after(A)boiling
Sampling date
A/B A/B

sonK.-JKonoplevaI.V.and Popov V.E
Quantitative assessment of radiocaesium
789-7922000
transfer in soiMern system, j.2yjrQ1glzaj Ezl-
gjlggrjjlg ay&c7gazlaggEzzZ 13 97-102
2005

perimental testingin response to the Fukushima
Danchi Nuclear Power Plant accident ag-
~sμlgrg,84,1282-12842011

book of Parameter vajues for the Prediction of
Radionuclide Transfer in Terrestrial and Fresh-
water Environments IAEA Technical Report
Series N0.472,1AEA,vienna2010
dioactive lj7Cs, stable lsCs and K from soU, 1/j-
ron.POlh4t.117,4034092002
diocesium : a review of mechanisms, regulation
and application,J.£z.,51,1635-16452000
horsetailj?ljjgzlarwlsgeffects of potas-
sium under different light and nitrogen condi-
tionsjSd.,47,47-541999
):Comparison of Direct Deposition and Root
uptake Results after the Fukushima Daiichi Nuclear
Power Plant Accident
ku,Chiba-shi,Chiba Pref. 263-8555,Japan
Field horsetail(z,,z77αΓyag)is a kind
and the Jertile shoots are eaten as vegetables in Japan in
the spring.since Jem species tend to concentrate radio
caesium fromsoilcθceΓααjjzrjθ77ρ'
compared using salnples collected in 20H(7)
2012(77J)the sample collected in 20H received direct
dePositionom the Fukushima Daiichi Nudear Power
/)/ααcd&?w/zj/eθjecθ//ecZa/2θ72c/£4&?jΓα
shoots were collected at each sampling time.7137Cs
concentration in samples collected in 2012 decreased
1002θθZjcθμαΓa/ZθMZ2θ77.Tlle radiocae-
2012 samPles were almost the same as those of 20H ,
/zθwarthe patterns were dlerentomthose of potas’
Slttnl.The radiocaesium removal percentage od proc-
(4gboihgr2.5 min)in 20H
while that2012 samples was 3272,the ejJect
direct deposition and root uptake was not dear.
(Received Aprn 26, 2012)