Efficiently absorb high-energy ray Transparent defence radiates shielded material is used in radioactive working place X-ray Y-ray has the glass of greater absorption force Density is 6.2 ∼ the glass of 6.5 g/cm3, use frequently there are ZF seriesInY- ray role is not easy the optical glass of coloration In K509, the content of CeO2 is approximately 0.4% ∼ 0.5% , In K709, CeO2 is approximately 1 ...