US3887807A
Expired / Lapsed
US
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Elements and process for recording direct image neutron radiographs
Assignee: Eastman Kodak Co
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Filing: 1973-07-20
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Granted: 1975-06-03
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Expires: 1993-07-20
Abstract
Abstract An element is provided for recording a direct image neutron radiograph, thus eliminating the need for a transfer step (i.e. the use of a transfer screen). The element is capable of holding an electrostatic charge and comprises a first layer for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and a second layer for conducting the current generated by the absorbed neutrons, said neutron absorbing layer comprising an insulative layer comprising neutron absorbing agents in a concentration of at least 1017 atoms per cubic centimeter. An element for enhancing the effect of the neutron beam by utilizing the secondary emanations of neutron absorbing materials is also disclosed along with a process for using said device.
Inventors
- 👤 Jr Robert V Poignant
- 👤 Edwin P Przybylowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:09
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/04; G01N23/05; G01T; G01T3/00; Y; Y10; Y10S; Y10S430/00; Y10S430/154
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
8 words
applying a voltage across the image recording means;
Claim 2
Dependent Claim
8 words
applying a voltage across the image recording means;
Claim 3
Dependent Claim
10 words
applying an electrostatic charge to the surface of said element;
Claim 4
Dependent Claim
10 words
applying an electrostatic charge to the surface of said element;
Claim 5
Dependent Claim
66 words
An element for reducing a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter.
Claim 6
Dependent Claim
66 words
An element for reducing a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter.
Claim 7
Dependent Claim
66 words
AN ELEMENT FOR REDUCING A DIRECT IMAGE NUETRON RADIOGRAPH, SAID ELEMENT BEING CAPABLE OF HOLDING AN ELECTROSTATIC CHARGE AND COMPRISING MEANS FOR ABSORBING NEUTRONS AND GENERATING A CURRENT BY DISSIPATION OF SAID ELECTROSTATIC CHARGE IN PROPORTION TO THE NUMBER OF NEUTRONS ABSORBED, SAID NEUTRON ABSORBING MEANS COMPRISING AN INSULATIVE LAYER COMPRISING A NEUTRON ABSORBING AGENT IN A CONCENTRATION OF AT LEAST 10**17 ATOMS PER CUBIC CENTIMETER.
Claim 8
Dependent Claim
66 words
AN ELEMENT FOR REDUCING A DIRECT IMAGE NUETRON RADIOGRAPH, SAID ELEMENT BEING CAPABLE OF HOLDING AN ELECTROSTATIC CHARGE AND COMPRISING MEANS FOR ABSORBING NEUTRONS AND GENERATING A CURRENT BY DISSIPATION OF SAID ELECTROSTATIC CHARGE IN PROPORTION TO THE NUMBER OF NEUTRONS ABSORBED, SAID NEUTRON ABSORBING MEANS COMPRISING AN INSULATIVE LAYER COMPRISING A NEUTRON ABSORBING AGENT IN A CONCENTRATION OF AT LEAST 10**17 ATOMS PER CUBIC CENTIMETER.
Claim 9
Dependent Claim
78 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means contiguous with said neutron absorbing means for conducting said current, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter.
Claim 10
Dependent Claim
78 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means contiguous with said neutron absorbing means for conducting said current, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter.
Claim 11
Dependent Claim
61 words
exposing said test object to said neutron flux in the presence of said element to dissipate the electrostatic charge in those areas of the surface of said element which correspond to the areas of said test object which are transparent to said neutron flux, thereby forming an electrostatic charge image of said test object on the surface of said element; and
Claim 12
Dependent Claim
61 words
exposing said test object to said neutron flux in the presence of said element to dissipate the electrostatic charge in those areas of the surface of said element which correspond to the areas of said test object which are transparent to said neutron flux, thereby forming an electrostatic charge image of said test object on the surface of said element; and
Claim 13
Dependent Claim
36 words
exposing the test object to the neutron flux in the presence of the imaGe recording means, thereby forming an electrostatic charge image of the test object on the charge-accepting means of the image recording means; and
Claim 14
Dependent Claim
36 words
exposing the test object to the neutron flux in the presence of the imaGe recording means, thereby forming an electrostatic charge image of the test object on the charge-accepting means of the image recording means; and
Claim 15
Dependent Claim
5 words
developing the electrostatic charge image.
Claim 16
Dependent Claim
5 words
developing the electrostatic charge image.
Claim 17
Dependent Claim
5 words
developing said electrostatic charge image.
Claim 18
Dependent Claim
5 words
developing said electrostatic charge image.
Claim 19
Dependent Claim
23 words
An element according to claim 2 wherein the neutron absorbing means comprises an insulative layer having a resistivity of at least 1010 ohm-cm.
Claim 20
Dependent Claim
43 words
An element according to claim 2 wherein the neutron absorbing agents have a ratio of neutron absorption coefficient to X-ray absorption coefficient of at least unity and are present in a concentration range from about 1021 to about 1023 atoms per cubic centimeter.
Claim 21
Dependent Claim
111 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means contiguous with said neutron absorbing means for conducting said current, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter, said neutron absorbing agent having a neutron cross-section per atom of at least one barn, and having a ratio of neutron mass absorption coefficient to gamma ray absorption coefficient of at least unity.
Claim 22
Dependent Claim
111 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means contiguous with said neutron absorbing means for conducting said current, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter, said neutron absorbing agent having a neutron cross-section per atom of at least one barn, and having a ratio of neutron mass absorption coefficient to gamma ray absorption coefficient of at least unity.
Claim 23
Dependent Claim
23 words
An element according to claim 5 wherein the neutron absorbing means comprises an insulative layer having a resistivity of at least 1010 ohm-cm.
Claim 24
Dependent Claim
26 words
An element according to claim 5 wherein the neutron absorbing agents are present in a concentration range from about 1021 to 1023 atoms per cubic centimeter.
Claim 25
Dependent Claim
20 words
An element according to claim 5 wherein the neutron absorbing agent is an organic material having a high hydrogen content.
Claim 26
Dependent Claim
39 words
An element according to claim 5 wherein the neutron absorbing agent is an organometallic compound containing an isotope of an element selected from the group consisting of boron, cadmium, dysprosium, europium, gadolinium, gold, indium, lithium, rhodium, samarium and silver.
Claim 27
Dependent Claim
29 words
An element according to claim 9 wherein the neutron absorbing agent is an organometallic compound containing an isotope selected from the group consisting of boron, 10B, and lithium, 6Li.
Claim 28
Dependent Claim
44 words
An element according to claim 9 wherein the neutron absorbing agent is an organometallic compound selected from the group consisting of tri Beta -naphthyl borate, tri Alpha -naphthyl borane, methylamine borane, bis(methylamine)borane, tri(methylamine)borane, gadoliniumhexaantipyrine chloride, hexaantipyrene gadolinium (III) perchlorate, triphenylborine amine, and copper triphenylphosphineborane.
Claim 29
Dependent Claim
13 words
An element according to claim 9 wherein the organometallic compound comprises a tetraarylborate.
Claim 30
Dependent Claim
33 words
An element according to claim 5 wherein the neutron absorbing agent comprises an element selected from the group consisting of berylium, boron, cadmium, carbon, chlorine, eupopium, gadolinium, hydrogen, lithium, nitrogen, oxygen and samurium.
Claim 31
Dependent Claim
29 words
An Element according to claim 13 wherein the neutron absorbing agent is selected from the group consisting of B2O3, BN, BP, BC, CdS, CdF2, Gd2O3 and gadolinium gallium garnet.
Claim 32
Dependent Claim
19 words
An element according to claim 5 wherein the neutron absorbing agent is a composition comprising CdS, CdO and B2O3.
Claim 33
Dependent Claim
34 words
An element according to claim 15 wherein the neutron absorbing agent is a composition comprising about 4.1 percent by weight CdS, about 48.8 percent by weight CdO, and about 47.1 percent by weight B2O3.
Claim 34
Dependent Claim
34 words
An element according to claim 15 wherein the neutron absorbing agent is a composition comprising about 4.9 percent by weight CdS, about 46.4 percent by weight CdO, and about 48.7 percent by weight B2O3.
Claim 35
Dependent Claim
129 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons said neutron absorbing means simultaneously emanating secondary radiation, means for enhancing the effect of the neutron beam by capturing said secondary emanations and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means for conducting said current, said neutron absorbing means comprising neutron absorbing agents in a concentration of at least 1017 atoms per cubic centimeter, said neutron absorbing agents having a neutron cross-section of at least one barn, having a ratio of neutron absorption coefficient to gamma ray absorption coefficient of at least unity, said neutron enhancing means comprising an ionizing radiation sensitive insulative material.
Claim 36
Dependent Claim
129 words
An element for recording a direct image neutron radiograph, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons said neutron absorbing means simultaneously emanating secondary radiation, means for enhancing the effect of the neutron beam by capturing said secondary emanations and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and means for conducting said current, said neutron absorbing means comprising neutron absorbing agents in a concentration of at least 1017 atoms per cubic centimeter, said neutron absorbing agents having a neutron cross-section of at least one barn, having a ratio of neutron absorption coefficient to gamma ray absorption coefficient of at least unity, said neutron enhancing means comprising an ionizing radiation sensitive insulative material.
Claim 37
Dependent Claim
15 words
An element according to claim 18 wherein the neutron absorbing means comprises the element boron.
Claim 38
Dependent Claim
29 words
An element according to claim 19 wherein the neutron enhancing means comprises an ionizing radiation sensitive insulative material selected from the group consisting of lead oxide and amorphous selenium.
Claim 39
Dependent Claim
81 words
A process for using a neutron flux to make a direct image neutron radiograph of a test object on an element, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter, said process comprising:
Claim 40
Dependent Claim
81 words
A process for using a neutron flux to make a direct image neutron radiograph of a test object on an element, said element being capable of holding an electrostatic charge and comprising means for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, said neutron absorbing means comprising an insulative layer comprising a neutron absorbing agent in a concentration of at least 1017 atoms per cubic centimeter, said process comprising:
References Cited (Backward Citations)
US2825814A
Cited
US3390270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |