Table 2.

Radioactive flux from each of the shale basins considered for four concentration scenarios

Scenario	Flowback water flux			Local natural groundwater			Global natural groundwater			Local natural surface water
	Ra-226	Ra-228	K-40	Ra-226	Ra-228	K-40	Ra-226	Ra-228	K-40	Ra-226	Ra-228	K-40
Barnett	2,408,423	5,544	1,615	347,241	88,152		1,375,726	87,728	12,922
Bowland	2,379		113	1.5		4.9	1,648		22.8	3.4	11.6	6.8
Poland	77,960		4	10,777	290		12,307	635	121

All values are the 1 % exceedance values, and all are given in kilobecquerels per year