Table 2.
Values of RAI obtained by the ratio between the maximum value measured in case study the area and the background value over different areas in the world.
| Author | Area | Fault type | Maximum value | Background value | RAI |
|---|---|---|---|---|---|
| This study | Pusteria valley —Periadriatic fault system | Transpressive fault | 816 kBq m−3 | 50 kBq m−3 | 16 |
| Ciotoli et al.7 | Fucino plain—SBGMF | Normal fault | 119 kBq m−3 | 25 kBq m−3 | 5 |
| Zhou et al.40 | Tibet—Lhasa | Normal fault | 87.4 kBq m−3 | 7.6 kBq m−3 | 11 |
| Li et al.41 | Yanhuai basin, Hebei | undefined | 57.8 kBq m−3 | 8.1 kBq m−3 | 7 |
| Yao and Wang42 | Jixian mountain, Tianjing | undefined | 58.6 kBq m−3 | 3.2 kBq m−3 | 18 |
| Zhou et al.43 | Haiyuan, Ningxia | undefined | 38.3 kBq m−3 | 5.8 kBq m−3 | 7 |
| Seminsky et al.11 | Baikal-Mongolian sesismic belt—Khustai fault | Normal fault | 20.2 kBq m−3 | 3.9 kBq m−3 | 5 |
| Wang et al.16 | North China—Tangshan area | Normal fault | 38.4 kBq m−3 | 4.7 kBq m−3 | 8 |
| Chen et al.13 | Capital of China—KQF fault | undefined | 206.7 kBq m−3 | 11.6 kBq m−3 | 18 |
| Xuan et al.44 | Thua Thien Hue (Vietnam)—Dak Rong-Hue fault | undefined | 144.5 kBq m−3 | 24.8 kBq m−3 | 6 |