Some common radioactive intensity of stone material

In 2000 countries the stone material of radioactive standard - "the radiological health protection standard building materials," according to the intensity of the radiation building materials can be divided into three levels (category) :

Class A decoration materials, decoration materials of natural radioactive nuclide radium - 226 and thorium - 232, k - 40 of the radioactivity specific activity at the same time satisfy the requirement of IRa and Ir acuities were 1.3 1.0 or less for A kind of decoration materials. A kind of decoration materials production and marketing and the use scope is not restricted.

Class B decoration materials: did not meet the requirements of class A decoration materials but at the same time satisfy the requirement of IRa and Ir acuities were 1.9 1.3 or less for A class B decoration materials. Class B interior decoration materials cannot be used for class I civil building, but can be used in class I all civil construction of veneer and other inside and outside of the building facing. That is B type stone material cannot be used for buildings such as residential, factory, public living room, etc.), but can be used for structures (such as a fence, gate house, pavilion, pavilion, veranda, memorial arch, patio, water tower, chimney, electric pole, DAMS, roads, DunCang, etc.);

C class decoration materials: did not meet the requirements of A and B class decoration materials that could satisfy the requirement of Ir 2.8 or less but for C class decoration materials. Class C outside decoration materials only can be used in the structure of the veneer and other outdoor use, must limit the sale, that is type C stone can only be used outdoors, as for the Ir > 2.8 can only be used for stone embankment, culverts, DAMS, dikes and deeply buried pipeline engineering such as far away from the place of people's life.

Part of the stone radioactive classification control standards and data

Stone material goods

Radioactive elements

Rank (category)

Radium (Bq/kg)

Thorium (Bq/kg)

Potassium (Bq/kg)

Pearl flower granite  27.5 82.2 1326.0 Class A

Wan Shangong granite 28.0 27.7 1018.0 Class A

Malachite green granite 27.5 48.7 1275.2 Class A

Indian red granite 218.9 280.1 1238.0 Class C

The May Day red granite 247.6 247.6 1316.3 Class B

Guilin red granite 241.2 246.9 1549.2 Class C

Red of luoyuan granite 80.8 96.4 1446.0 Class A

Shidao red granite 85.6 182.0 444.0 Class B

Maple red granite 107.8 108.6 1260.3 Class B

The general red granite 11.4 40.1 1473. 0 Class A

The cuckoo red granite 470.8 910.4 3054.7 More than class C

Taishan red granite 90 83.2 1104 Class A

LuJin flower granite 119.5 157.2 1282 Class B

Cherry red granite 104.7 104.5 1205.8 Class B

Chrysanthemum yellow granite 12.5 29.2 1455 Class A

Ma Langong granite 102.7 189.5 1196 Class B

Red granite in South Africa 49.8 142.6 1328 Class B

Sanbao red granite 71.8 28 1545 Class B

Jinan green granite 5.5 4.3 131.1 Class A

white granite 40.6 21.1 978 Class A

Five lotus granite 145.5 315.0 1309 Class B

Rosy granite 143.2 182.5 1310 Class B

Taishan red granite 109.1 173.8 1338 Class B

The cuckoo green granite 483.5 792.6 3313 More than class C

Xili red granite 92.3 105.6 1362 Class A

Qin creek red granite 96.4 109.5 1273 Class B

Red of plain granite 119 184 1395 Class B

Pink diamond granite 138.5 175 1468 Class B

Red granite gorge 57.5 208 1400 Class B

Tiger bei granite 71.0 104 1608 Class B

Lilac granite 116 110 1619 Class B

The granite pink hills, 147.5 170.8 1520Class B

Li Hong Kong red granite 32.8 91.3 1191 Class B

From October 2000 national building materials radioactive supervision and inspection center)

In general, the darker than light-colored stone radiation, a red stone radioactive is the highest, followed by green, pink, grey, black, white; Igneous rocks (magmatic rocks) higher than the metamorphic rock and sedimentary rock, is higher than that of marble, granite and then is limestone, SLATE, sandstone.

Natural stone radiation harm to human body is not only to the radiation in vitro, at the same time is more important to his "body" radiation, which shone in human body caused by radioactive elements. And natural stone material produces in the process of decay of the radioactive elements "radon" of unequilibrium radon and room temperature and can form radioactive aerosol, pollute the air in the air, intercept, vulnerable to respiratory system and accumulates in the lung regions, so that we are of low doses of radiation, the so-called internal exposure.

Common natural stone material on the surface of the radon exhalation rate

Stone material goods

Surface radon exhalation rate (%)

Pearl flower 0.85 + / - 0.29

Wan Shangong 1.06 + / - 0.35

LuJin flowers 0.44 + / - 0.21

Indian red 7.05 + / - 1.82

May 1 red 8.85 + / - 2.21

Ma Langong 0.82 + / - 0.49

The maple leaves are red 4.35 + / - 2.39

The general red 0.35 + / - 0.12

Pink hillock 2.43 + / - 1.01

Five lotus 0.43 + / - 0.16

Mount tai is red 0.28 + / - 0.13

Taishan red 1.97 + / - 0.61

The cuckoo green 15.50 + / - 6.23

Chrysanthemum yellow 0.18 + / - 0.07

Qin creek red 1.79 + / - 0.84

Jinan blue 0.10 + / - 0.03

Mr. Tiger 0.41 + / - 0.22

Li Hong Kong red 1.52 + / - 0.62

Also, under normal circumstances stone of radon exhalation rate from high to low in turn into red, green, pink, grey, white and black, and exhalation rate higher than that of marble and granite.