Dose criterion

0.3 mSv∙y⁻¹

1 mSv∙y⁻¹

Materials used in bulk amount. e.g. land development, concrete, etc.

$I_{\gamma }\le 0.5$

$I_{\gamma }\le 1$

Superficial and other materials with restricted use. e.g. tiles, board, etc.

$I_{\gamma }\le 2$

$I_{\gamma }\le 6$