Table 19.

Suggested probability distributions and arithmetic means for the concentration ratios (CR) for arthropods (whole organism) with respect to soil (Bq kg⁻¹_{fresh weight} per Bq kg^‑1_{dry weight}).^a

Element	Wildlife type	Modeb	Minimum	Maximum	Arithmetic meanc
Sr	arthropods	8.4 × 10−2	6.3 × 10−2	1.9 × 100	3.0 × 10−1
Ru	arthropods	4.1 × 10−3†	4.1 × 10−4	4.1 × 10−2	6.3 × 10−3
I	arthropods	2.8 × 10−1	9.0 × 10−2	8.4 × 10−1	3.1 × 10−1
Cs	arthropods	2.4 × 10−2	2.0 × 10−3	1.7 × 100	1.1 × 10−1
	arthropods-herbivorous	4.7 × 10−3	3.0 × 10−3	7.1 × 10−2	1.3 × 10−2
Ba	arthropods	3.8 × 10−2*	3.8 × 10−3	3.8 × 10−1	5.8 × 10−2
Pu	arthropods	1.6 × 10−2	4.2 × 10−4	2.5 × 10−1	2.5 × 10−2

^aAll distributions are log-triangular distributions (as plotted in logarithmic space). Values of CR were obtained from IAEA 2014 (Table 5). For most cases, the mode (in logarithmic space) represents the geometric mean (or median) of the available data, and the minimum and maximum are the reported minimum and maximum values. If the reported minimum and maximum values differed by less than a factor of 10, the minimum and maximum values of the distribution were set at a factor of 3 below and above the mode (in logarithmic space), respectively. The mode value (in logarithmic space) with an asterisk (*) represents only one reported value (IAEA 2014), and the mode value (in logarithmic space) with a dagger (†) represents a geometric mean for which minimum and maximum values were not available. For these cases, the minimum and maximum have been set to a factor of 10 below and above the mode (in logarithmic space), respectively.

^bParameter values are for the log-triangular distribution as plotted in logarithmic space.

^cThe arithmetic mean of the indicated distribution; this value can be used as a point estimate in deterministic assessments.