Ecological half-life of 137Cs in mosses and lichens in the Ordu province, Turkey by Cevik and Celik

Çevik, U.; Çeli̇k, Necati

doi:10.1016/j.jenvrad.2008.09.010

Cited by 35 publications

(16 citation statements)

References 14 publications

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“…Potassium-40 activity concentrations did not strongly vary (Table 3) ranging from 38 kg -1 to 95 Bq kg -1 with a mean±SD of 61±14 Bq kg -1 and a median of 60 Bq kg -1 (n = 62). The 40 K levels in our lichens generally correspond to the levels reported for different epiphytic lichens from Europe and Asia (Table 6), although much higher activity concentrations of 40 K, ranging from 350±30 Bq kg -1 to 2100±190 Bq kg -1 , were found in Flavoparmelia caperata and Parmotrema perlatum from the Ordu province in Turkey [20].…”

Section: Potassium-40supporting

confidence: 86%

“…The literature data on relationship between 40 K and 137 Cs in lichens are controversial. Cevik and Celik [20] report that 137 Cs activity concentration shows a tendency to decrease with the increments of 40 K activity concentration and K content in two species of epiphytic lichens collected in the Ordu province in Turkey in 2007. Kahraman et al [43] also found negative relationship between the 137 Cs and 40 K activity concentrations in different epiphytic lichens collected in the Bursa province in Turkey in 2010.…”

Section: Relationship Between Activity Concentrations Of Radionuclidementioning

confidence: 99%

“…The reasons could be the washing out of the radionuclide from roofs and tree stems or aeolian redistribution [8]. However, the majority of authors reported declining time trends of the radiocesium content in various epigeic, epiphytic and epilitic lichens (e.g., [19,20,21,22]). The removal of cesium radioisotopes from lichen occurs both due to physical (radioactive) decay (decay constant λ phys ) and by biological elimination processes characterized by rate constant λ bio [23].…”

Section: научные статьиmentioning

confidence: 99%

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Temporal variations of 7Be, 40K, 134Cs and 137Cs in epiphytic lichens (genus Usnea) at the Sakhalin and Kunashir islands after the Fukushima accident

Рамзаев¹,

Barkovsky²,

Громов³

et al. 2016

Radiac. gig. (2008)

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Temporal variations of radionuclide levels in the epiphytic Usnea sp. lichens from the two islands Sakhalin and Kunashir, the Sakhalin region, Russia have been evaluated using the already published (2011)(2012)(2013) and new experimental data (2015). A total of 62 lichen samples were measured using high purity germanium γ-ray detectors and multichannel analyzers. In the period 2011-2015, activity concentrations of the anthropogenic radionuclides 134 Cs and 137 Cs and the natural radionuclides 7 Be and 40 K were found to be in the range of (<0.53)-41. 3, 0.55-50.6, 99-603 and 35-95 Bq kg -1 on dry weight, respectively. The activity concentrations of 134 Cs and 137 Cs in lichens were statistically significantly higher at Kunashir than at Sakhalin. The present-day levels of radiocesium activity concentrations in lichens are low: < 6 Bq kg -1 for 137 Cs and <1 Bq kg -1 for 134 Cs. A decline in the annual median 137 Cs activity concentrations in lichens from 2011 to 2015 corresponds to a biological half-life of 1.2 y for Kunashir and 1.1 y for Sakhalin. The activity concentrations of 137 Cs and 134 Cs in lichens were strongly correlated (r=0.978, P<0.01) and the 134 Cs biological half-life value of 1.2 y in the period 2011-2013 was similar to the corresponding 137 Cs biological half-life value. The soil-tolichens aggregated transfer factor, T ag , for 134 Cs at time t=0 after the Fukushima accident is calculated as 0.56 m 2 kg -1 at Sakhalin and 0.31 m 2 kg -1 at Kunashir. In contrast to radiocesium, the natural radionuclides 7 Be and 40 K did not show clear time-dependent variations in the Usnea lichens. No correlation was found between 7 Be and 40 K as well as between 40 K and cesium radioisotopes. However, positive and statistically significant (P<0.05) correlations were obtained between 7 Be and cesium radioisotopes. High abundance of the Usnea sp. lichens in the study area and large values of T ag for radiocesium in the lichens make these organisms suitable candidates for detection of low levels of airborne radioactive contamination of the environment.

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Section: Potassium-40supporting

confidence: 86%

Section: Relationship Between Activity Concentrations Of Radionuclidementioning

confidence: 99%

Section: научные статьиmentioning

confidence: 99%

See 1 more Smart Citation

Temporal variations of 7Be, 40K, 134Cs and 137Cs in epiphytic lichens (genus Usnea) at the Sakhalin and Kunashir islands after the Fukushima accident

Рамзаев¹,

Barkovsky²,

Громов³

et al. 2016

Radiac. gig. (2008)

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“…Papastefanou et al, 1989;Topcuoglu et al, 1995;Pröhl et al, 2006). In a long-term study of individual species in northeastern Turkey, Cevik & Celik (2009) found ecological half-lives for 137 Cs of 1.8-10.4 years for mosses and 2.1-13.7 years for lichens. This compares with ecological half-lives of 4.0-7.7 years for mosses and 5.8 years for lichens in the allochthonous plant material flowing into Øvre Heimdalsvatn.…”

Section: Discussionmentioning

confidence: 99%

“…This compares with ecological half-lives of 4.0-7.7 years for mosses and 5.8 years for lichens in the allochthonous plant material flowing into Øvre Heimdalsvatn. It is clear that ecological half-lives of 137 Cs in plant material will vary with species and catchment characteristics such as soil type, precipitation, altitude and potassium concentrations (Cevik & Celik, 2009). Peles et al (2002) found longer ecological half-lives for 137 Cs in primary producers compared to consumers in a contaminated stream.…”

Section: Discussionmentioning

confidence: 99%

A long-term study of catchment inputs of 137Cs to a subalpine lake in the form of allochthonous terrestrial plant material

Brittain

Bjørnstad²

2010

Hydrobiologia

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The input of allochthonous plant material, largely terrestrial in origin, during the spring spate is a major source of primary production for montane lake ecosystems such as Øvre Heimdalsvatn and is readily incorporated into the food chain leading to fish. The transport from the lake catchment of allochthonous plant material contaminated with Chernobyl 137 Cs in 1986 was investigated from 1989 to 2008. 137 Cs activity concentrations were determined for both total samples before sorting and for the separate components in the two main tributary streams, Brurskardbekken and Lektorbekken, as well as the outflow river, Hinøgla. The total samples showed a similar long-term decline at all sites, although 137 Cs activity concentrations were generally somewhat higher in Hinøgla compared to the tributary streams. For the total samples, ecological half-lives were in the region of 4-5 years. However, there were major differences between components. The 137 Cs activity content of most components, including mosses, leaves of willow and woody material, decreased significantly over time. Lichens and juniper declined, but the relationship was not significant, while leaves of mountain birch and dwarf birch showed no obvious trend over the 20-year period.

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A long-term study of catchment inputs of 137Cs to a subalpine lake in the form of allochthonous terrestrial plant material

Brittain¹,

Bjørnstad²

2010

The Subalpine Lake Ecosystem, Øvre Heimdalsvatn, and Its Catchment: Local and Global Changes Over the Last 50 Years

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Ecological half-life of 137Cs in mosses and lichens in the Ordu province, Turkey by Cevik and Celik

Cited by 35 publications

References 14 publications

Temporal variations of 7Be, 40K, 134Cs and 137Cs in epiphytic lichens (genus Usnea) at the Sakhalin and Kunashir islands after the Fukushima accident

Temporal variations of 7Be, 40K, 134Cs and 137Cs in epiphytic lichens (genus Usnea) at the Sakhalin and Kunashir islands after the Fukushima accident

A long-term study of catchment inputs of 137Cs to a subalpine lake in the form of allochthonous terrestrial plant material

A long-term study of catchment inputs of 137Cs to a subalpine lake in the form of allochthonous terrestrial plant material

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