Table 8.

Parameters and values for the calculation of dose because of external gamma-rays in the mining area and in the smelting area, ^a indicates a particular value of the raw data.

Symbol	Name	Value	Unit
E	Additional annual effective dose		mSv
	Dose coefficient for external gamma because of NORM for 40K	0.029	nSv kg h−1 Bq−1
	Dose coefficient for external gamma because of NORM for 232Th-decay series	0.46	nSv kg h−1 Bq−1
	Dose coefficient for external gamma because of NORM for 238U-decay series	0.30	nSv kg h−1 Bq−1
	Natural mass share of 40K from potassium	0.000117
	Natural mass share of 232Th from thorium	1
	Natural mass share of 238U from uranium	0.9927
	Share of the potassium in the ground	31 300a	mg kg−1
	Share of the thorium in the ground	26.2a	mg kg−1
	Share of the uranium in the ground	2.93a	mg kg−1
	Specific activity 40K	265	Bq mg−1
	Specific activity 232Th	4.05	Bq mg−1
	Specific activity 238U	12.4	Bq mg−1
tonly_tailing	Annual duration of exposure on tailing	500	h
twork	Annual duration of exposure next to tailing	2000	h
tliving	Annual duration of exposure while in living area	8760	h
m	Needed mass of neodymium per 3 MW turbine	560	kg
	Total mass of produced rare-earth metals	55 000 000	kg
	Total mass of produced rare-earth metals	55 000 000	kg
	Number of exposed workers working on the tailing (Bayan Obo)	100
	Number of exposed workers working next to tailing (Bayan Obo)	6000–100
	Number of exposed inhabitants in living area (Bayan Obo)	23 000–6000
	Number of exposed workers working on the tailing (Baotou City)	600
	Number of exposed workers working next to tailing (Baotou City)	40 000–600
	Number of exposed inhabitants in living area (Baotou City)	1 510 000–40 000