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In 2000, Chinese Government issues the ‘Standard of Natural Stone’s Radioactivity Used on Buildings’, which classified them into 3 kinds, A can be used in everywhere. B cannot be used indoors, but can be used outside, such as walls, smoke-funnel, dams, C is limited to used in the place where is far from people live.
The following is the detailed datas,
|
Sample’s Name
|
Radium |
Thorium |
Potassium |
Grades |
| Pear Flower |
27.5 |
82.2 |
1326.0 |
A |
| Red Wang Shan |
28 |
27.7 |
1018.0 |
A |
| Green Peacock |
27.5 |
48.7 |
1275.2 |
A |
| Red Indian |
218.9 |
280.1 |
1238.0 |
C |
| Red May Day |
247.6 |
247.6 |
1316.3 |
B |
| Red Guilin |
241.2 |
246.9 |
1549.2 |
C |
| Red Luoyuan |
80.8 |
96.4 |
1446.0 |
A |
| Red Stone Island |
85.6 |
182.0 |
1444.0 |
B |
| Red Marple Leaf |
107.8 |
108.6 |
1260.3 |
B |
| Red General |
11.4 |
40.1 |
1473.0 |
A |
| Red Dujuan |
470.8 |
910.4 |
3054.7 |
C |
| Red Taishan |
90 |
83.2 |
1104.0 |
A |
| Red Lujin |
119.5 |
157.2 |
1282.0 |
B |
| Red Cherry |
104.7 |
104.5 |
1205.8 |
B |
| Yellow Chrysanthemum |
12.5 |
29.2 |
1455.0 |
A |
| Red Malan |
102.7 |
189.5 |
1196.0 |
B |
| Red South Africa |
49.8 |
142.6 |
1328.0 |
B |
| Red Sanbao |
71.8 |
128 |
1545.0 |
B |
| Dark Blue Jilan |
5.5 |
4.3 |
131.1 |
A |
| White Baideng |
40.6 |
21.1 |
978.0 |
A |
| Flower Wulian |
145.5 |
315.0 |
1309.0 |
B |
| Red Rose |
143.2 |
182.5 |
1310.0 |
B |
| Red Taishan |
109.1 |
173.8 |
1338.0 |
B |
| Green Dujian |
483.5 |
792.6 |
3313.0 |
C |
| Red Xili |
92.3 |
105.6 |
1362.0 |
A |
| Red Cenxi |
96.4 |
109.5 |
1273.0 |
A |
| Red Chuan |
119 |
184 |
1395 |
B |
| Red Huidong |
138.5 |
175.0 |
1468.0 |
B |
| Red Shanxia |
57.5 |
208 |
1400 |
B |
| Purple |
116 |
110 |
1619 |
B |
| Red Li Gang |
132.8 |
91.3 |
1191 |
B |
Besides, according to ICRP, the Density of Radon should be less than 100Bq／m3. But according to the Chinese Standard, the Density of Radon is that
A is less than 70Bq; B is less than 90Bq; C is less than 100Bq
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