Assessment of Natural Radioactivity Levels and Radiation Hazards in Agricultural and Virgin Soil in the State of Kedah, North of Malaysia

Table 4

Gamma-index () values proposed by the European Commission (1999) taking in to account typical way and amounts in which the material is used in a building [13].

Dose criterion	0.3 mSv y^−1	1 mSv y^−1
Materials used in bulk amounts	≤ 0.5	≤ 1
For example, bricks superficial and other materials with restricted use: tiles, boards, and so forth	≤ 2	≤ 6