Seasonal variations in the latest physicochemical fractions from 137 Cs
Relationship between the activity intensity of 137 Cs each and every physicochemical fraction on the belly material which of 137 Cs within the muscles
The activity density regarding 137 Cs about strength and you will stomach contents of insane boar products checked-out within analysis was indeed when you look at the the new selections out-of 47–2030 and 20–833 Bq kg –step one FM, correspondingly, and that illustrated a-one- so you’re able to several-order out of magnitude differences, although these types of examples was indeed obtained within this a relatively restricted geographical city (Nihonmatsu city, 344 km 2 ). The latest rates of some other physicochemical fractions out of 137 Cs when you look at the the fresh tummy information was step 3–98%, 0–52% and you will dos–81% towards the exchangeable, destined to all-natural matter and you can strongly-bound fractions, https://www.datingranking.net/es/sitios-de-citas-populares/ respectively, proving ong new boars. The latest imply ratio of one’s exchangeable fraction are 38 ± twenty-four (simple deviation [SD]) %, recommending you to definitely whenever forty% of ate topic is immersed seemingly on time.
Figure 2 shows the relationship between the activity concentration of 137 Cs in muscle and that in the physicochemical fractions of the stomach contents. The activity concentration of 137 Cs in muscle showed a strong correlation with those in the following fractions of the stomach contents: (1) the activity concentration of 137 Cs in the exchangeable fraction (in Bq kg ?1 dry weight [hereinafter, “DW”]; r = 0.67, P < 0.0001, R 2 = 0.44); and ((2) the activity concentration of 137 Cs and the sum of 137 Cs in the exchangeable and bound to organic matter fractions (in Bq kg ?1 DW, r = 0.60, P < 0.0001, R 2 = 0.34) (Fig. 2). In particular, the correlation coefficient was highest for the 137 Cs in the exchangeable fraction.
Figure step 3 suggests changes in the activity intensity of 137 Cs during the muscle hence on stomach content out-of July in order to October. The game levels out of 137 Cs inside muscles was basically equivalent for the July and you may August and you may tended to rise in Sep and you can October. The activity concentration of 137 Cs from the stomach content demonstrated a propensity to raise out of July so you can October (Fig. 3). Regular variations were observed in the activity concentration of 137 Cs about muscle mass of crazy boars when you look at the Fukushima, plus the pastime intensity of 137 Cs diminished away from April to help you August, increased out-of Sep in order to November and stayed higher away from December so you’re able to March; 19 the pattern about passion concentration of 137 Cs when you look at the muscle mass within research is actually about consistent with seasonal differences. Profile cuatro reveals alterations in the activity density out of 137 Cs on physicochemical fractions of your stomach information. 4). No significant relationships try located amongst the pastime intensity of 137 Cs in the destined to normal matter and you will strongly bound portions (Fig. 4).
The outcomes of your present data indicated that the game concentration from 137 Cs from inside the muscle mass showed a robust correlation with that from inside the (1) the game intensity of 137 Cs throughout the exchangeable fraction, and (2) the game intensity of 137 Cs of your own amount of 137 Cs in the exchangeable and you can bound to natural amount portions. This indicates the pastime intensity of 137 Cs throughout the exchangeable fraction of used issue, after that regarding the destined to natural number small fraction, all otherwise element of that is considered absorbed inside the brand new belly, are relevant to the fresh new import regarding 137 Cs towards muscles out of a wild boar. No confident correlation try observed between your passion concentration of 137 Cs throughout the firmly sure small fraction and that inside muscle, recommending that pastime intensity of 137 Cs regarding highly likely tiny fraction did not have a marked influence on new accumulation of 137 Cs in the torso. At exactly the same time, 137 Cs craft focus account was basically considered high within the your head and you can viscera compared to new muscle of your own freshwater seafood ayu (Plecoglossus altivelis) in Fukushima 8 . It was seen as while the viscera of them fish absorbs hard to consume dirt (we.e. 137 Cs when you look at the frozen fractions, particularly silt and you can particulates) when taking periphytic algae. While doing so, a portion of the radiocaesium on the rectal contents isn’t absorbed of the system out-of wild boar, but rather, goes through about faeces twenty-five . It has also come suggested you to definitely drank situation consists of some 137 Cs that isn’t pulled to your body, and that all of the 137 Cs regarding firmly sure fraction present in the tummy articles is excreted of in place of getting engrossed by the muscles 25 . If your physicochemical portions out of 137 Cs inside faeces excreted regarding the human body are exchangeable otherwise destined to all-natural amount fractions, then there’s a danger you to definitely radionuclides may be then concentrated into the dung beetles, fungus or other organisms that utilize the faeces out of wild boars twenty-five . The outcome on the investigation showed that the latest portion of the highly sure fraction regarding 137 Cs from the belly contents was 42 ± 23%, anywhere between dos–81% in most examples (Dining table step one). While the 137 Cs from the strongly sure small fraction, that was perhaps not absorbed about tummy, could be focused and excreted about faeces, it is expected one to a substantial amount of 137 Cs in the the firmly likely fraction is obtainable during the faeces. When considering the latest dictate away from 137 Cs towards ecosystem otherwise the new fictional character off 137 Cs regarding the ecosystem, it is critical to screen and therefore physicochemical fractions away from 137 Cs try within faeces.