摘要:
Glass composition having a high absorption of X-radiation, particularly in the wavelength region from 0.3 - 0.7 A, for use in fabricating high voltage vacuum tube glass envelopes. The glass compositions are a type of lead oxide containing glass which can be characterized as having an aggregate content of barium oxide with antimony oxide and cadmium oxide in excess of 10% by weight and further having an aggregate content of lead oxide with barium oxide, antimony oxide and cadmium oxide in excess of 55% by weight.
摘要:
A glass suitable for the window of a cathode-ray television display tube having a relatively increased transmission for red light (at approximately 618 mn) and a relatively decreased transmission for blue light (at approximately 455 nm). The glass, which is otherwise standard, includes NiO and CoO in a weight ration between 10 and 30 and satisfies the condition that
摘要:
An improved ternary lanthanum-zinc-borate glass composition having improved ultraviolet light transmission in near ultraviolet spectral range, and a process for preparing such a glass composition wherein the near ultraviolet light transmission is improved by small amounts of compounds such as lanthanum and zinc fluorides and chlorides, and tin, arsenic and antimony oxides.
摘要:
A dosimeter glass material exhibiting good durability against weathering, good workability, high sensitivity, low predose and low fading characteristics is comprised of from 40 to 55 parts by weight of lithium metaphosphate and complementarily, from 60 to 45 parts by weight of aluminum metaphosphate and from 2 to 11% of silver metaphosphate based on the combined weight of said lithium and aluminum metaphosphates.
摘要:
This invention is directed to glasses especially suitable for use as television picture tube faceplates which exhibit linear X-ray absorption coefficients at 0.6 A of at least 35 cm.sup.-1 and very little browning from X-radiation and electron impingement thereon. The glasses are essentially free from PbO and other readily-reducible metal oxides and consist essentially, in weight percent on the oxide basis, as calculated from the batch, of:______________________________________ SiO.sub.2 43-55 Al.sub.2 O.sub.3 0-4 ZnO 5-12 Li.sub.2 O 0.5-3 Na.sub.2 O 4-8 K.sub.2 O 3-8 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 10-18 CaO 0-5 SrO 2-14 BaO 10-20 CaO + SrO + BaO 16-30 CeO.sub.2 0.3-1 ZrO.sub.2 2-8 ______________________________________
摘要:
Glass filters and their use in controlling transmission of radiation is disclosed. The filters have a sharp transmission cut off within the ultraviolet region of the spectrum and also withstand high temperatures and severe heat shock. They are produced from a fused silica glass having a composition consisting essentially of silica and 1-25 percent R2O5 wherein the R2O5 consists of 0-5 percent Nb2O5 and/or 0-25 percent Ta2O5. The transmission cut off may be shifted across the ultraviolet transmission range by varying the amount of additive.
摘要:
Quartz glass includes iron and aluminum. The total iron content ranges from 0.01 to 5% by weight, and the total aluminum content ranges from 0.01 to 10% by weight. The quartz glass exhibits infrared rays-absorbing ability and visible light-transmitting ability. Also a process for making such a quartz glass is disclosed.