If radiation penetrates the human tissue, there is a risk of damage to tissue and organs. Radiation Shielding Glasses RD 50 and RD 30 provide optimum protection, as they contain a high percentage of lead oxide, absorbing the rays. The figure "50" stands for a min. 5,05 g/cm³ density. The figure "30" stands for a min. 3,13 g/cm³ density. Which glass is used depends on the lead equivalent, which is determined for each application