Au contraire! The data of Figure 21 support just the reverse. As can be seen in this study by S. Zhai et al., eight of the ten cancers investigated are higher in the low-radiation group.
A second Chinese study compared several reproduction related criteria for the two groups. In this case the "high" population consisted of 13,425 peasants [their word], with the control "lows" numbering 13,987. Figure 22 shows the relative percentages of reproductive "problems" between the groups. Unless there are some unknown confounding factors at work here, it is evident that living in a low-background radiation area is not conducive to large families.
If high-background radiation caused an increase in spontaneous abortion, neonatal mortality, or infertility, there would be no end to regulators and the protection bureaucracy attempting to move us all to new locations, dig up the farm, and bury it somewhere. But since all three of these factors are decreased with an increase in background radiation, no one seems to notice.