公开(公告)号：US20220289619A1

公开(公告)日：2022-09-15

申请号：US17754117

申请日：2020-09-14

申请人： Sumita Optical Glass, Inc.

发明人： Yoshinori YAMAMOTO ,  Tomoyuki NAKAYAMA ,  Takuya SAKAI ,  Kosuke TOMITA

IPC分类号： C03C4/08 ,  C03C3/068 ,  C03C3/155 ,  G21F1/06

摘要： Provided is an X-ray shielding glass having high shielding capability against X-rays with a tube voltage of 150 kV or less. The X-ray shielding glass has a composition including: 15 mass % to 25 mass % B2O3; 7 mass % to 50 mass % La2O3; 7 mass % to 50 mass % Gd2O3; 10 mass % to 25 mass % WO3; 0 mass % to 7 mass % SiO2; 0 mass % to 10 mass % ZrO2; 0 mass % to 8 mass % Nb2O5; 0 mass % to 10 mass % Ta2O5; 0 mass % to 5 mass % Bi2O3; 0 mass % to 3 mass % CeO2; and 0 mass % to 1 mass % Sb2O3, wherein the glass contains no ZnO, the total content of La2O3 and Gd2O3 is 45 mass % to 65 mass %, and when the thickness of the glass is 3 mm, the transmittance of the glass to an X-ray from an X-ray tube with a tube voltage of 60 kV is 0.0050% or less, and the transmittance of the glass to an X-ray from an X-ray tube with a tube voltage of 100 kV is 0.1500% or less.