JPS58208151A - Glass composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This study relates to a microchannel system using a horned crow, which is suitable for the production of microchannel plates.

Alkali-lead-silicon Dh tA4 glass has often been used in the manufacture of microchannel plates. In the microchannel plate, the flow of electrons into each V-row microchannel is doubled +1. Q = 4-ru. Each time a deuteron hits the wall forming the glass channel, multiple electrons are emitted ("secondary emission").
).

63-72 mol% SiO□, 20-30 mol% Rb
Starvation - 7 mol% alkali oxide component and 1 mol%
(less than) As□O,, Bi□O1,to, J: BiA
g2O,.

A microchannel plate made from Noras was found to have 2-theta emission characteristics of 1:1 and provide stability.To enable higher operating temperatures. 1 (preferably this glass is 5102
is 65 mol% or more, and has Rb and Cs in the alkaline component which is larger than the Ltf or Na component. The glass transition temperature Tg of this glass is preferably 450 to provide resistance to microchannel plate staining and thermal deformation.
In order to take flexibility into consideration, the temperature Ts (at a temperature above this μ, the material deforms viscously under its own weight) ) (80℃μ higher than -11Tg.

Microchannel in medical//luma-ray camera
Preferred embodiments of glasses that are particularly useful in plates include real H (unitary amounts of radioactive isotopes (e.g.,
There are low concentrations of alkaline elements, including potassium oxide, which contains a 7Rb , and rubidium oxide, which contains a 7Rb . If this is not the case, it will cause background noise, resulting in a reduction in image resolution and contrast.

The present invention is a preferred example of TF4 i, set and manufacturing 1. I will explain about ζ first, but before that, I will briefly explain the cross-sectional view of the microchannel flute of the glass according to the present invention.

Structure micro channel 7 rate 10 is l゛,j 'l
・A large number of walls 14 are formed by a wall 14 which cuts out a single channel of the glass having the set y described. lk. ? 1 with rZ microchannel 12.

Composition In a preferred embodiment of the present invention, 1: The number of stitches is shown in the column "Crow 6" in the table below U.

Manufacture Glass: aU + 戊11 1 is a method of supplying specific amounts of the compounds listed in the table by standard melting methods in an oxygen-enriched melting atmosphere in ceramic lined crucibles (prepared from suitable raw materials in 1 cup). This formulation is given in the table (in mole percent oxides, but as glass department technicians will recognize, carbonates, nitrates).

Sulfur T'! #Salts or halides are acceptable raw materials.

Glass tubes are manufactured from glass compositions by extrusion, as is well known to those skilled in the art. Glass 61'j, at high temperatures and pressures of 450°C to give flexibility in process control without significant risk of thermal distortion during the manufacture of microchannel plates.
Higher glass transition temperature 1iTg: A drooping temperature 1fuTs that is 80°C or more higher than t6 and 'r. High operating temperatures are possible due to the large proportion of 8102 and the absence of low atomic number alkaline components, namely Li and Na.

Other Specific Examples In addition to the preferred glass compositions labeled as Glass 6 in the table above, the preferred glass compositions are also labeled as Glasses 1-5 in the table and have 63-72 mole percent Sj, 02°20- 30 mol% P and 0.3-7 mol% real carbon oxide component, 1-
65 mol% alkaline earth acids (arsenic components 6 and 1 mol%)
Unskinned Ar=203+ Bl□01. and Ag2O3
The cursor having ``i-#'' is considered as part of the present invention and has some dependent `i-#'Ij'F ＠＾
[required] within the range d17. Preferably, this /J shirasu has 65 mol % or more of 8102 and has more Rj and Gs in the alkaline component than the Na component across Ll, in order to obtain a higher operating temperature.

When the glass is used in the microchannel plate in a medical cancer 7-ray camera, it contains a substantial amount of emissive isotopes (e.g. potassium oxide containing 19K, and 37K).
It is desirable that the concentration of alkali elements including Rb (rubidium chloride) is low.1 This means that a gamma ray camera has a first-class peak exposure time of 5 to 10 minutes, and a microchannel. - This is because the noise of f+14-4' from the plate fittings results in a 1 degree reduction in the angle and contrast of the image. Glass 1 is an example of an ultra-low noise glass with no detectable potash or rubidium oxide. glass 2, 3 and 6
is a low noise glass with engrafted rubidium oxide and no detectable potassium oxide.

[Brief explanation of the drawing]

1ffia is the glass microchannel of the present invention.
It is a sectional view of a plate. 10: Microchannel plate 12: Microchannel 14: Patent applicant featuring channels Galileo Electro-Optics Bow-Boration (4 others) - 〆10

Claims (1)

Claims: (]) 663,772 mol of SiO3°21] - 30 mol % of Pb0. 3-7 mol% alkaline oxidation chamber component. and 1-3.5 mol% alkaline earth oxide components, wherein the glass is useful in the manufacture of microchannel plates, the glass comprising less than 1 mol% As2O3,B1
□03. and Al2O3. (2) The glass of claim (1), wherein the glass has a glass transition temperature greater than 450°C and a droop temperature greater than 80°C above the glass transition temperature. (3) A glass according to claim 1, wherein the concentration of an alkali element containing a substantial amount of a radioactive isotope is low enough to reduce background noise. (4) the glass has 65 mol% or more of SzO2, and the total mol% of Rb and Cs in the alkaline components is greater than the total mol% of the alkaline components L1 and Na;
Glass according to claim (1). (5) The glass t・165.72 mol% of 8102.2
．． 12 mol% Rb2O and 0.97 mol% C82
Claim no. (3) or (4) I with 0
(Glass as described. (6) S-glass has 68.00 mol% of 5102,1.
60 mo/l/% Li0. 2.80 mo/”% Na
Glass according to claim 1, consisting of 20 and 0.30 mol % OsO and having no detectable K or Rb. (7) 69.90 mol% of the glass t・ma 5102 +
1.38 mol% Rb2O and 477 mol% CS
20)° or (4)
) Note: Glass of Defeat. (8) The glass has 6440 mol% Sio2,2.20
mol% Rb2O, and 2.05 mol% OS20
Consisting of! 1 person i'Frequest)l? The range of ■■Thornoras described in item (3) or (4). (9) The glass contains 6900 mol% SiO□, 5.24
mol% KO, 1,10 mol% Rb2O and 018
Claim 7Ai consisting of mole % G S 20
The glass described in item l) or (4)... (10) The i'i glass is 71.2 mol% SiO
□, 0.20 mol% (') L102 + o, 4
．． Glass according to claim 1 or (4) VC, comprising 5 mol% Na20, 365 mol% Na20 and 1.20 mol% Rb2O. (II) 63-72 mol% 3102 +20-6
A microchannel plate made of glass comprising 0 mol% of Pb0°3-7 mol% of an alkali oxide component and 1-3.5 mol% of an alkaline earth oxide component, Δ32Q less than % 3. B 12
03: A microchannel plate characterized by having ka and Ag2O3. , 1121, the concentration of alkali elements contained in the ``f body'' is low enough to reduce the Pack-Brown 1 noise, and the scope of claim No. 411+10 ((Plate described.