CA1111578A - Self-powered high temperature neutron sensor - Google Patents
Self-powered high temperature neutron sensorInfo
- Publication number
- CA1111578A CA1111578A CA308,989A CA308989A CA1111578A CA 1111578 A CA1111578 A CA 1111578A CA 308989 A CA308989 A CA 308989A CA 1111578 A CA1111578 A CA 1111578A
- Authority
- CA
- Canada
- Prior art keywords
- connection pin
- emitter
- pin
- conductor
- inner conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT
A vanadium emitter cylinder is keyed by a cross-pin to an axially extending connection pin of which one end is seated in the emitter body. The inner conductor used for the sensor connection is wrapped around the free end of the connection pin, put through a transverse bore in its mid-portion, then bent over in the axial direction of the connection pin and spot welded thereto.
The pointed end of the connection pin rests on an insulating spacer through which passes the measuring inner conductor and in which ends another inner conductor used as a compensating conductor. A tubular outer conductor of the connecting cable comes to an end in abutment against the insulating spacer and is electrically connected with an outer conducting collector shell through an intermediate conducting sleeve fitted on the end of the outer cable conductor.
The various pins and conductors, as well as the outer shell, are made of Inconel nickel-chromium alloy. The helical winding prevents unavoidable thermal stresses from straining the spot welds by which the inner conductor is fastened to the connection pin.
A vanadium emitter cylinder is keyed by a cross-pin to an axially extending connection pin of which one end is seated in the emitter body. The inner conductor used for the sensor connection is wrapped around the free end of the connection pin, put through a transverse bore in its mid-portion, then bent over in the axial direction of the connection pin and spot welded thereto.
The pointed end of the connection pin rests on an insulating spacer through which passes the measuring inner conductor and in which ends another inner conductor used as a compensating conductor. A tubular outer conductor of the connecting cable comes to an end in abutment against the insulating spacer and is electrically connected with an outer conducting collector shell through an intermediate conducting sleeve fitted on the end of the outer cable conductor.
The various pins and conductors, as well as the outer shell, are made of Inconel nickel-chromium alloy. The helical winding prevents unavoidable thermal stresses from straining the spot welds by which the inner conductor is fastened to the connection pin.
Description
l~ilS7B
This invention concerns a self-powered high temperature neutron sensor of a kind connected to an inner conductor of a connection line that has a tubular outer conductor, and particularly a ~ or gamma induced neutron flux measurer not requiring any auxiliary energy.
Neutron sensors for water cooled nuclear reactors that are designed for operating temperatures up to about 400 C are known. Such neutron sensors contain an emitter which is excited by neutrons. A distinction is drawn between slowly responding emitters, in which a (N-~) reaction takes place and promptly responding emitters which are excited by neutrons to emit gamma rays. The emitter is surrounded by a collector, with an insulated cylinder being interposed. The emitter must be connected to the inner conductor associated with the outer casing connection.
In high temperature nuclear reactors, such neutron sensors are ex-posed to higher requirements and stresses, because they must operate at temperatures of about 800 C over longer periods without trouble. At these high tempera~ures the electrical connection between the emitter and the inner conductor of the connection line has been found to be a critical location.
This connection is exposed to thermal stresses and also to variable loads, especially because the materials of which the emitter, connection line, collector and a spacing ceramic body have different thermal expansion coef-ficients. The conventional connections between connection line conductor and emitter by hard soldering, welding or pinching (i.e. pressure cold welding) have been found to be inadequate.
It is an object of the present invention to provide a connection between the inner connection line conductor and the emitter of a high tem-perature neutron sensor in such a form that it can be utilized at high tem-peratures under strong variable thermal stresses.
Briefly, the invention provides a self-powered high temperature neutron sensor having a cylindrical emitter connected to the inner conductor - 1 - ~
of a sensor probe electrical connection line that also comprises a tubular outer conductor, wherein: said emitter has an axially directed connection pin extending therefrom: said connection pin has a transverse bore in its middle region; said inner conduction passes through said bore of said connection pin, has a bent over section which is welded to said connection pin, and has a portion which is wrapped in a close helix around said connection pin. As a result of the helical wrapping, length changes resulting from temperaure variations are readily accommodated, so that stresses do not appear at the place of welding. No shear loads bear on the weld site.
It is preferred to bend over the end of the inner conductor at its emergence from the bore through the connection pin so that it runs along the surface of the latter in an axial direction (i.e. along a generatrix line of the cylindrical surface of the connection pin) and is welded there, which provides a particularly secure and durable connection. Preferably one end of the connection pin is seated in an axial bore of the emitter and the other end has a conical point that bears against an insulating cylinder that closes off the tubular outer conductor of the connection line.
For securing the connection between emitter and connection pin, a fastening pin is passed through a transverse bore of the emitter in register with a second transverse bore of the connection pin and the outer ends of the bore through the emitter are flared or countersunk so that the fastening pin can be fitted tightly with upset ends like a rivet. A ceramic insulating shell preferably encloses the end of the connection line conductor, the in-sulating cylinder, the connection pin and the emitter and the entire assembly is then surrounded by a cylindrical collector shell thatis closed off by a sealed plug at the free end of the device. These enclosures provide a sealed and encapsulated form of high temperature neutron sensor that is particularly stable and well suited for all applications.
~liS~
THE DRANING
The invention is further described by way of illustrative example with reference to the single figure of the annexed drawing which is a longitudinal section view of an embodiment of the invention. The high tem-perature neutron sensor illustrated in the drawing is seated on the end of an electrical connecting cable l of the shielded type that consists of tubular shield conductor tube 2 and two inner conductors 3 and 4, of which one is used as the compensating conductor 3 and the other as the measuring conductor 4. The conductors are made of a nickel-chromium alloy known as "Inconel"
that is distinguished by high capability for resisting the effects of heat and corrosion and is well suited for use in neutron sensors. The connecting cable 1 also contains insulators of magnesium oxide. In a typical embodiment of the invention the outer conductor has an outer diameter of 2.0mm and a wall thickness of 0.24mm. The diameter of the inner conductors 3 and 4 is 0.36mm.
The length of the connection cable depends of course on the anticipated conditions and requirements of the installation in which the sensor will be used and can amount to a few meters. In the drawing, only the end piece of the connection cable is shown on which the neutron sensor proper is built.
The opposite end of the connection cable is equipped with a plug connector for providing connection to other electrical circuits. At the sensor con-nection end, the outer conductor 2 is removed for a length of about 50mm.
The compensating conductor 3 has an end piece 3' extending about 5mm beyond the end of the outer conductor. The measuring inner conductor 4 has an end piece 41 extending beyond the outer conductor 2 for the previously mentioned 50mm length which is handled as follows in assembling the device.
An intermediate or spacer sleeve 5 that is about 20 mm long and has a stepwise cut-back inner diameter is slipped onto the outer conductor 2.
The outer diameter of the sleeve is uniformly 3.1mm and corresponds to the inner diameter of a collector 6. This sleeve serves for conductive bridging lil~S78 between the outer conductor and the collector 6. The inter~ediate sleeve 5 is fitted on the outer conductor so that its end with the smaller inner diameter is directed toward the end of the outer conductor 2. The sleeve 5 is fastened to the outer conductor 2 by a circular seam weld 7 that also provides a seal. The intermediate sleeve 5 likewise is made of the above-named nickel-chromium alloy.
An insulating cylinder 8 of pure aluminum oxide is provided that has an outer diameter of 2.2mm and a length of 3mm. This component is of course a ceramic part. Two bores of a diameter of O.5mm are provided in this insultaing cylinder 8. The bores serve for the passage of the inner con-ductors. The end piece 3' of the compensating conductor 3 ends in one of the bores 9, while the end piece 4' of the measuring in a conductor extends out through the other bore. The insulating cylinder 8 rests on the outer con-ductor 2 and thereby serves as a spacer.
An emitter 10 of cylindrical form is provided as the measuring body. This emitter is of vanadium which provides a time-extended indication of detected neutrons. The emitter has a diameter of 2mm and a length of 200mm.
At the connection end of the emitter is an axial bore 11 3.5mm deep having a diameter of l.Omm. This bore 11 is crossed by a transverse bore 12 the out-er ends of which have conical flares 13. The electrical connection of the emitter 10 with the measuring inner conductor is provided by means of a cylindrical connection pin 14 that has a conical point 15 at the connecting end. The connection pin is 11mm long, has a diameter of 1.0~m and also consists of the already identified nickel-chromium alloy. The blunt end of the connection pin 14 is seated in the bore 11 of the emitter 10. Inside this end is a transverse bore 16 having a diameter of O.Amm that is flush with the transverse bore 12 of the emitter 10. Mo~e or less in the middle of the connection pin, more precisely at a distance of 6mm from the blunt end, is another transverse bore 17.
1~1578 A pin-shaped fastening piece 18 of the above-named nickel alloy extends through the connecting transverse bores 12 and 16 of the emitter 10 and the connection pin 14. This fastening pin has a head at one end and is deformed at the other end by mechanical working after the fashioning of a rivet, so that the fastening pin is seated conformally in the transverse bores 16 and 12 and thereby provides a mechanically and electrically secure con-nection between the emitter 10 and the connection pin 14. The conical flares 13 of the transverse bore 12 provide trouble-free countersunk seating of the rivet heads of the pin 18.
The end 4' of the me&suring inner conductor is wound as a close helical winding 19 about the connection pin 14, led with a sharply bent portion 20 through the transverse bore 17 and then bent over to provide a further leg 21 running in the direction of the access of the connection pin 14 so as to lie along the outer surface of the pin 14. Several laser spot welds 22 secure a mechanical and electrical connection between the wire segment 21 and the connection pin 14. Since the connection pin 14 and the measurlng inner conductor 4 consist of the same material, these bodies have the same thermal expansion coefficient, so that the bent over section 20 and the once more bent over segment 21 of the measuring inner conductcr 4 is not sub~ect to any displacement relative to the connection pin 14. Consequently, there is no mechanical loading of the spot weld locations 22 as the result of temperature stresses. This eliminates all shear stressing of the spot weld sites. In consequence these spot welds are highly permanent and produce a trouble-free mechanical and electrical connection. Any differential thermal expansions are taken up by expansion and sh~fting of the helical winding 19.
In this region unhindered expansion is possible. In this way the unavoidable thermal expansion and shifts of the measuring inner conductor relative to the other parts of the high temperature neutron sensor are fully isolated from the spot weld sites 22 so that the latter are relieved of any load.
An insulating shell 23 provided as a part of a firm ceramic of pure llilS~
aluminum oxide surrounds the emitter 10, the connection pin 14 and also the insulating cylinder 8 and extends over the end portion of the outer conductor
This invention concerns a self-powered high temperature neutron sensor of a kind connected to an inner conductor of a connection line that has a tubular outer conductor, and particularly a ~ or gamma induced neutron flux measurer not requiring any auxiliary energy.
Neutron sensors for water cooled nuclear reactors that are designed for operating temperatures up to about 400 C are known. Such neutron sensors contain an emitter which is excited by neutrons. A distinction is drawn between slowly responding emitters, in which a (N-~) reaction takes place and promptly responding emitters which are excited by neutrons to emit gamma rays. The emitter is surrounded by a collector, with an insulated cylinder being interposed. The emitter must be connected to the inner conductor associated with the outer casing connection.
In high temperature nuclear reactors, such neutron sensors are ex-posed to higher requirements and stresses, because they must operate at temperatures of about 800 C over longer periods without trouble. At these high tempera~ures the electrical connection between the emitter and the inner conductor of the connection line has been found to be a critical location.
This connection is exposed to thermal stresses and also to variable loads, especially because the materials of which the emitter, connection line, collector and a spacing ceramic body have different thermal expansion coef-ficients. The conventional connections between connection line conductor and emitter by hard soldering, welding or pinching (i.e. pressure cold welding) have been found to be inadequate.
It is an object of the present invention to provide a connection between the inner connection line conductor and the emitter of a high tem-perature neutron sensor in such a form that it can be utilized at high tem-peratures under strong variable thermal stresses.
Briefly, the invention provides a self-powered high temperature neutron sensor having a cylindrical emitter connected to the inner conductor - 1 - ~
of a sensor probe electrical connection line that also comprises a tubular outer conductor, wherein: said emitter has an axially directed connection pin extending therefrom: said connection pin has a transverse bore in its middle region; said inner conduction passes through said bore of said connection pin, has a bent over section which is welded to said connection pin, and has a portion which is wrapped in a close helix around said connection pin. As a result of the helical wrapping, length changes resulting from temperaure variations are readily accommodated, so that stresses do not appear at the place of welding. No shear loads bear on the weld site.
It is preferred to bend over the end of the inner conductor at its emergence from the bore through the connection pin so that it runs along the surface of the latter in an axial direction (i.e. along a generatrix line of the cylindrical surface of the connection pin) and is welded there, which provides a particularly secure and durable connection. Preferably one end of the connection pin is seated in an axial bore of the emitter and the other end has a conical point that bears against an insulating cylinder that closes off the tubular outer conductor of the connection line.
For securing the connection between emitter and connection pin, a fastening pin is passed through a transverse bore of the emitter in register with a second transverse bore of the connection pin and the outer ends of the bore through the emitter are flared or countersunk so that the fastening pin can be fitted tightly with upset ends like a rivet. A ceramic insulating shell preferably encloses the end of the connection line conductor, the in-sulating cylinder, the connection pin and the emitter and the entire assembly is then surrounded by a cylindrical collector shell thatis closed off by a sealed plug at the free end of the device. These enclosures provide a sealed and encapsulated form of high temperature neutron sensor that is particularly stable and well suited for all applications.
~liS~
THE DRANING
The invention is further described by way of illustrative example with reference to the single figure of the annexed drawing which is a longitudinal section view of an embodiment of the invention. The high tem-perature neutron sensor illustrated in the drawing is seated on the end of an electrical connecting cable l of the shielded type that consists of tubular shield conductor tube 2 and two inner conductors 3 and 4, of which one is used as the compensating conductor 3 and the other as the measuring conductor 4. The conductors are made of a nickel-chromium alloy known as "Inconel"
that is distinguished by high capability for resisting the effects of heat and corrosion and is well suited for use in neutron sensors. The connecting cable 1 also contains insulators of magnesium oxide. In a typical embodiment of the invention the outer conductor has an outer diameter of 2.0mm and a wall thickness of 0.24mm. The diameter of the inner conductors 3 and 4 is 0.36mm.
The length of the connection cable depends of course on the anticipated conditions and requirements of the installation in which the sensor will be used and can amount to a few meters. In the drawing, only the end piece of the connection cable is shown on which the neutron sensor proper is built.
The opposite end of the connection cable is equipped with a plug connector for providing connection to other electrical circuits. At the sensor con-nection end, the outer conductor 2 is removed for a length of about 50mm.
The compensating conductor 3 has an end piece 3' extending about 5mm beyond the end of the outer conductor. The measuring inner conductor 4 has an end piece 41 extending beyond the outer conductor 2 for the previously mentioned 50mm length which is handled as follows in assembling the device.
An intermediate or spacer sleeve 5 that is about 20 mm long and has a stepwise cut-back inner diameter is slipped onto the outer conductor 2.
The outer diameter of the sleeve is uniformly 3.1mm and corresponds to the inner diameter of a collector 6. This sleeve serves for conductive bridging lil~S78 between the outer conductor and the collector 6. The inter~ediate sleeve 5 is fitted on the outer conductor so that its end with the smaller inner diameter is directed toward the end of the outer conductor 2. The sleeve 5 is fastened to the outer conductor 2 by a circular seam weld 7 that also provides a seal. The intermediate sleeve 5 likewise is made of the above-named nickel-chromium alloy.
An insulating cylinder 8 of pure aluminum oxide is provided that has an outer diameter of 2.2mm and a length of 3mm. This component is of course a ceramic part. Two bores of a diameter of O.5mm are provided in this insultaing cylinder 8. The bores serve for the passage of the inner con-ductors. The end piece 3' of the compensating conductor 3 ends in one of the bores 9, while the end piece 4' of the measuring in a conductor extends out through the other bore. The insulating cylinder 8 rests on the outer con-ductor 2 and thereby serves as a spacer.
An emitter 10 of cylindrical form is provided as the measuring body. This emitter is of vanadium which provides a time-extended indication of detected neutrons. The emitter has a diameter of 2mm and a length of 200mm.
At the connection end of the emitter is an axial bore 11 3.5mm deep having a diameter of l.Omm. This bore 11 is crossed by a transverse bore 12 the out-er ends of which have conical flares 13. The electrical connection of the emitter 10 with the measuring inner conductor is provided by means of a cylindrical connection pin 14 that has a conical point 15 at the connecting end. The connection pin is 11mm long, has a diameter of 1.0~m and also consists of the already identified nickel-chromium alloy. The blunt end of the connection pin 14 is seated in the bore 11 of the emitter 10. Inside this end is a transverse bore 16 having a diameter of O.Amm that is flush with the transverse bore 12 of the emitter 10. Mo~e or less in the middle of the connection pin, more precisely at a distance of 6mm from the blunt end, is another transverse bore 17.
1~1578 A pin-shaped fastening piece 18 of the above-named nickel alloy extends through the connecting transverse bores 12 and 16 of the emitter 10 and the connection pin 14. This fastening pin has a head at one end and is deformed at the other end by mechanical working after the fashioning of a rivet, so that the fastening pin is seated conformally in the transverse bores 16 and 12 and thereby provides a mechanically and electrically secure con-nection between the emitter 10 and the connection pin 14. The conical flares 13 of the transverse bore 12 provide trouble-free countersunk seating of the rivet heads of the pin 18.
The end 4' of the me&suring inner conductor is wound as a close helical winding 19 about the connection pin 14, led with a sharply bent portion 20 through the transverse bore 17 and then bent over to provide a further leg 21 running in the direction of the access of the connection pin 14 so as to lie along the outer surface of the pin 14. Several laser spot welds 22 secure a mechanical and electrical connection between the wire segment 21 and the connection pin 14. Since the connection pin 14 and the measurlng inner conductor 4 consist of the same material, these bodies have the same thermal expansion coefficient, so that the bent over section 20 and the once more bent over segment 21 of the measuring inner conductcr 4 is not sub~ect to any displacement relative to the connection pin 14. Consequently, there is no mechanical loading of the spot weld locations 22 as the result of temperature stresses. This eliminates all shear stressing of the spot weld sites. In consequence these spot welds are highly permanent and produce a trouble-free mechanical and electrical connection. Any differential thermal expansions are taken up by expansion and sh~fting of the helical winding 19.
In this region unhindered expansion is possible. In this way the unavoidable thermal expansion and shifts of the measuring inner conductor relative to the other parts of the high temperature neutron sensor are fully isolated from the spot weld sites 22 so that the latter are relieved of any load.
An insulating shell 23 provided as a part of a firm ceramic of pure llilS~
aluminum oxide surrounds the emitter 10, the connection pin 14 and also the insulating cylinder 8 and extends over the end portion of the outer conductor
2 of the connecting cable. This insulating shell is 220mm long and has ar inner diameter of 2.3mm and an outer diameter of 2.9mm.
The collector 6 is a hollow cylindric~l body having an outer dia-meter of 3.5mm, an inner diameter of 3.1mm and a length of 240mm. It also consists of the previously named nickel-chromium alloy. The collector 6 is seated on the intermediate sleeve 5 and is fastened firmly to the sleeve by a weld seam 24. The free end is closed off by a cover 25 having a middle bore 6. The middle bore is fitted with a stopper 27. In each case a reliable seal is provided by weld seam 28 and 29 respectively. The cover 25 and stopper 27 also consist of the above-named nickel-chromium alloy. The assemb-ly of the individual parts of the neutron sensor has already been partly explained above. The individual parts are in each case carefully cleaned and heated to drive off impurities. After the insulating cylinder 8 is connected to the connecting cable 1 and the connecting pin 14 with the emitter 10, the end 4' of the measuring inner conductor is inserted through the bore 17 so that about 5mm extends out for the bent over segment 20. The helically wrapped winding 19 is then firmly wound on the connection pin 14. The wind-ing is continued until the conical point 15 of connection pin 14 abuts on the insulating cylinder 8 and the latter presses against the outer conductor 2 of the connecting cable. Then the segment 20 of the measuring inner conductor is bent over in the axial direction of the connection pin l~ and is fastened to the latter by the spot welds 22.
The insulating shell 3 and the collector with its cover 25 are then in turn put in place and the weld seams 24 and 28 are then completed, after which the assembly is carefully heated to drive off impurities. Thereafter, the central bore 26 of the cover 25 is closed by the stopper 27 and the device is hermetically sealed by a further weld seam 29. The neutron sensor is then finished.
1111~78 The thermal expansion coefficient of the nickel-chromium alloy is about twice as great as that of vanadium. Consequently substantial thermal strains can arise in high temperature operation and particularly under stress of varying temperatures. These are however taken up without difficulty by the helical winding 19, so that the spot weld sited 22 are fully relieved of stress from thermal expansion. As a result the high temperature neutron sensor of the present invention has a long service life.
The emitter 10 can of course consist of a material other than vanadium. The emitter can consist of a different material in which a (N-beta) reaction takes place or a material in which a (N-gamma) reaction can be in-duced.
Although the invention has been described in detail with reference to a particular illustrative embodiment, it will be evident that variations and modifications are possible within the inventive concept.
The collector 6 is a hollow cylindric~l body having an outer dia-meter of 3.5mm, an inner diameter of 3.1mm and a length of 240mm. It also consists of the previously named nickel-chromium alloy. The collector 6 is seated on the intermediate sleeve 5 and is fastened firmly to the sleeve by a weld seam 24. The free end is closed off by a cover 25 having a middle bore 6. The middle bore is fitted with a stopper 27. In each case a reliable seal is provided by weld seam 28 and 29 respectively. The cover 25 and stopper 27 also consist of the above-named nickel-chromium alloy. The assemb-ly of the individual parts of the neutron sensor has already been partly explained above. The individual parts are in each case carefully cleaned and heated to drive off impurities. After the insulating cylinder 8 is connected to the connecting cable 1 and the connecting pin 14 with the emitter 10, the end 4' of the measuring inner conductor is inserted through the bore 17 so that about 5mm extends out for the bent over segment 20. The helically wrapped winding 19 is then firmly wound on the connection pin 14. The wind-ing is continued until the conical point 15 of connection pin 14 abuts on the insulating cylinder 8 and the latter presses against the outer conductor 2 of the connecting cable. Then the segment 20 of the measuring inner conductor is bent over in the axial direction of the connection pin l~ and is fastened to the latter by the spot welds 22.
The insulating shell 3 and the collector with its cover 25 are then in turn put in place and the weld seams 24 and 28 are then completed, after which the assembly is carefully heated to drive off impurities. Thereafter, the central bore 26 of the cover 25 is closed by the stopper 27 and the device is hermetically sealed by a further weld seam 29. The neutron sensor is then finished.
1111~78 The thermal expansion coefficient of the nickel-chromium alloy is about twice as great as that of vanadium. Consequently substantial thermal strains can arise in high temperature operation and particularly under stress of varying temperatures. These are however taken up without difficulty by the helical winding 19, so that the spot weld sited 22 are fully relieved of stress from thermal expansion. As a result the high temperature neutron sensor of the present invention has a long service life.
The emitter 10 can of course consist of a material other than vanadium. The emitter can consist of a different material in which a (N-beta) reaction takes place or a material in which a (N-gamma) reaction can be in-duced.
Although the invention has been described in detail with reference to a particular illustrative embodiment, it will be evident that variations and modifications are possible within the inventive concept.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A self-powered high temperature neutron sensor having a cylindrical emitter connected to the inner conductor of a sensor probe electrical con-nection line that also comprises a tubular outer conductor, wherein: said emitter has an axially directed connection pin extending therefrom: said connection pin has a transverse bore in its middle region; said inner con-duction passes through said bore of said connection pin, has a bent over section which is welded to said connection pin, and has a portion which is wrapped in a close helix around said connection pin.
2. A neutron sensor as claimed in claim 1 in which said bent over section of said inner conductor which is welded to said connection pin is the end of said inner conductor and is bent over at the emergence of said end from said bore and extends therefrom in the axial direction of said connection pin on the surface of said connection pin.
3. A neutron sensor as claimed in claim 2 in which said end of said inner conductor is bonded to said connection pin by a plurality of spot welds.
4. A neutron sensor as claimed in any of claims 1 - 3, in which said connection pin is provided with a conical point at its free end and in which an insulating cylinder closes off the tubular conductor and abuts said end point of said connection pin, said inner conductor passing through said in-sulating cylinder.
5. A neutron sensor as claimed in claim 3 in which said emitter is provided with an axial bore in which said connection pin is seated.
6. A neutron sensor as claimed in claim 5 in which said connection pin has a second transverse bore in the portion of said connection pin that is within said axial bore of said emitter, said emitter also having a transverse bore which is arranged to register with said second transverse bore of said connection pin, a fastening pin being provided that passes through the transverse bore of said emitter and said second transverse bore of said connection pin.
7. A neutron sensor as claimed in claim 6 in which the ends of said fastening pin are upset in the manner of rivet heads.
8. A neutron sensor as claimed in claim 7 in which said rivet head ends of said fastening pin lie in countersunk ends of said transverse bore of said emitter.
9. A neutron sensor as claimed in any of claims 1 - 3 in which the end portion of said tubular outer conductor of said emitter and said con-nection pin are encased in a ceramic insulating shell, the entire assembly being enclosed in a cylindrical collector having a sealed end plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA308,989A CA1111578A (en) | 1978-08-09 | 1978-08-09 | Self-powered high temperature neutron sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA308,989A CA1111578A (en) | 1978-08-09 | 1978-08-09 | Self-powered high temperature neutron sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1111578A true CA1111578A (en) | 1981-10-27 |
Family
ID=4112083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA308,989A Expired CA1111578A (en) | 1978-08-09 | 1978-08-09 | Self-powered high temperature neutron sensor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1111578A (en) |
-
1978
- 1978-08-09 CA CA308,989A patent/CA1111578A/en not_active Expired
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