Table 5.

Parameters of RADRUE model and their distributions used to calculate individual stochastic thyroid doses due to external irradiation and inhalation of ¹³¹I and short-lived radionuclides which were considered to be shared (subject related).

Parameter			Central value (arithmetic mean (AM))	Distribution	Reference
Description	Symbol	Unit
Duration of performance of cleanup mission task	Δtj	d	AM and CVa from database	U((1-CV)×AM, (1+CV)×AM)b or U(0.9×AM, 1.1×AM)	(Kryuchkov et al. 2009)
External irradiation
Exposure rate in air	P[x(tj), y(tj)]	mGy h−1	AM and GSD from database	TLN(GMc, GSD, GSD−2×GM, GSD2×GM)d	(Kryuchkov et al. 2009)
Conversion coefficient from exposure rate in air to the thyroid dose	Cth	mGy h−1 per mGy h−1	0.739	TN(AM, 0.1×AM, AM– 2×SD, AM+2×SD)e	Expert judgement
Shielding factor	Lj	unitless	Table 2 from (Kryuchkov et al. 2009)	TN(AM, 0.25×AM, AM– 2×SD, AM+2×SD)	(Kryuchkov et al. 2009)
Inhalation of 131I and short-lived radionuclides
131I concentration in air	$C_{air}^{I-131}$	kBq m−3	AM and GSD from database	TLN(GMc, GSD, GSD−2×GM, GSD2×GM)d	(Talerko 2005b)
Ventilation rate	Bm	m3 d−1	(ICRP 2002)	TLN(0.94×AM, 1.4, 0.5×GM, 2×GM)	(Goosens et al. 1998)
Thyroid mass	mth	g	20	TLN(0.94×AM, 1.4, 0.5×GM, 2×GM)	(Likhtarov et al. 2013)
Fraction of inhaled iodine transferred to blood	winh	unitless	0.66	TR(0.5, 0.66, 0.82)f	(ICRP 1995)
Fraction of iodine uptake by thyroid	wth	unitless	0.3	TR(0.2, 0.3, 0.4)	(ICRP 1993)
Biological half-time of iodine removal from the thyroid	Tb	d	89	TR(76, 89, 102)	(ICRP 1993)

^aCoefficient of variation, CV = AM/SD.

^bU(min, max): uniform distribution with the following parameters: minimal value (min), maximal value (max).

^c$GM=AM\cdot {\left[\sqrt{e^{{\left(ln\left(GSD\right)\right)}^2})}\right]}^{-1}$ (derived from (Carroll et al. 2006); GM: geometric mean; AM: arithmetic mean; GSD: geometric standard deviation).

^dTLN(GM, GSD, min, max): truncated lognormal distribution with the following parameters: geometric mean (GM), geometric standard deviation (GSD), minimal value (min), maximal value (max).

^eTN(AM, SD, min, max): truncated normal distribution with the following parameters: arithmetic mean (AM), standard deviation (SD), minimal value (min), maximal value (max).

^fTR(min, mode, max): triangular distribution with the following parameters: minimal value (min), mode of distribution (mode), maximal value (max).