Optimising sampling strategies for emergency response: Vegetation sampling

Khomutinin, Yu.V.; Фесенко, С. В.; Levchuk, S.; Holiaka, Dmytrii; Kashparov, V.

doi:10.1016/j.jenvrad.2021.106605

Cited by 4 publications

(20 citation statements)

References 25 publications

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“…In this study, we investigated the variability in radiocesium activity concentrations in growing shoots of hardwood species, which has been utilized to establish indices of radiocesium absorption [10, 11], with a particular focus on the hardwood bed logs that are commonly used in mushroom cultivation. The radiocesium activity concentration in the forest products has been demonstrated to follow a log-normal distribution [15, 19]. After the two largest nuclear power plant accidents to date, Chornobyl and Fukushima, radioactivity concentrations in many agricultural and forest products have been measured, and transfer factors ( TF ) and aggregated transfer factors ( T ag) have been reported [30–32].…”

Section: Discussionmentioning

confidence: 99%

“…Based on the WAIC values (Table 4), we could select the simpler model with a constant standard deviation, instead of the model with a varying standard deviation among stands. Thus, we could treat the variability of radiocesium contamination of forest products as uniform irrespective of stands, as shown in crops and grasses [19]. The standard deviation of log-transformed concentration within each stand was estimated to be 0.74 as the posterior mean, and its standard deviation was estimated to be 0.03 (Table 5).…”

Section: Discussionmentioning

confidence: 99%

“…The IAEA recommends sampling at least five trees to investigate the radioactivity of the natural environments contaminated by nuclear accidents [36]. Khomutinin et al [19] suggested that five-point samples taken from an area 1 m 2 were required in order to determine the radionuclide concentration in a combined vegetation sample. Consequently, we propose that sampling five individuals would be sufficient to estimate the radiocesium activity concentration in a coppice stand.…”

Section: Discussionmentioning

confidence: 99%

“…We assumed that the natural logarithm (hereafter written as logarithm) of the radiocesium activity concentration Y i (Bq kg -1 ) in the growing shoots followed a normal distribution [15, 19], namely where μ s [ i ] denotes the mean, and σ s [ i ] denotes the standard deviation for stand s [ i ] containing the i -th individual. We excluded censored data from the model analysis, as the detection limits of such data were indefinite and varied depending on the measurement time.…”

Section: Methodsmentioning

confidence: 99%

Section: Statistical Modelingmentioning

confidence: 99%

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Variability in radiocesium activity concentration in growing hardwood shoots in Fukushima, Japan

Itô,

Miura,

Komatsu

et al. 2023

Preprint

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The radiocesium contamination caused by the Fukushima Daiichi Nuclear Power Plant accident has made it difficult to use coppice woods as bed logs for mushroom cultivation. Evaluating the variability in the radiocesium activity concentration of logs is necessary in order to predict how many coppice woodlands are available for producing mushroom bed logs. To clarify the variability in radiocesium activity concentrations and to estimate the sample size required to estimate these concentrations with sufficient accuracy, we modeled the log-transformed radiocesium activity concentrations in growing shoots of hardwoods. We designed two models: (1) a model with mean concentrations that varied among stands with a standard deviation that was the same among stands, and (2) a model with varying means and standard deviations. We fit the data pertaining to onlyQuercus serratato both models and calculated the widely applicable information criterion values. Consequently, we adopted the simpler model (1). Applying the selected model to data for all species, we examined the relationship between the number of measurement individuals and the predictive distribution of the expected concentration. Based on previous recommendations and measurement costs, we proposed that five individuals would be appropriate for estimating radiocesium activity concentration in a stand.

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