WO2016001636A1 - Radiation shielding apparatus - Google Patents

Radiation shielding apparatus Download PDF

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Publication number
WO2016001636A1
WO2016001636A1 PCT/GB2015/051883 GB2015051883W WO2016001636A1 WO 2016001636 A1 WO2016001636 A1 WO 2016001636A1 GB 2015051883 W GB2015051883 W GB 2015051883W WO 2016001636 A1 WO2016001636 A1 WO 2016001636A1
Authority
WO
WIPO (PCT)
Prior art keywords
shielding member
shielding
radiation
radiation source
source
Prior art date
Application number
PCT/GB2015/051883
Other languages
French (fr)
Inventor
Oliver John BECKETT
Robert Falconer
Timothy Hough
Michael NICKLAS
Original Assignee
Johnson Matthey Public Limited Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Johnson Matthey Public Limited Company filed Critical Johnson Matthey Public Limited Company
Publication of WO2016001636A1 publication Critical patent/WO2016001636A1/en

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/18—Investigating the presence of flaws defects or foreign matter
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/02—Transportable or portable shielded containers with provision for restricted exposure of a radiation source within the container
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/02—Transportable or portable shielded containers with provision for restricted exposure of a radiation source within the container
    • G21F5/04—Means for controlling exposure, e.g. time, size of aperture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/30—Accessories, mechanical or electrical features
    • G01N2223/308—Accessories, mechanical or electrical features support of radiation source
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/60—Specific applications or type of materials
    • G01N2223/628—Specific applications or type of materials tubes, pipes

Definitions

  • Pipe scanning tools exist for scanning underwater pipes and include a source of gamma radiation rotated relative to a pipe to be scanned.
  • a known source apparatus for generating a beam of gamma radiation for such an apparatus has a housing of shielding material such as lead or tungsten alloy containing a gamma ray source such as a Cs 137 source.
  • the source apparatus is mounted to a cradle on a rotary part of the pipe scanning tool and the tool is mounted to a pipe.
  • a retractable part of the shielding of the source apparatus is then retracted by remote control means such as a remotely operated vehicle (ROV) to enable a beam of radiation to penetrate the pipe.
  • ROV remotely operated vehicle
  • the retractable part of the shielding is returned to its initial shielding position by remote control, the tool is recovered to a surface vessel and the source apparatus is dismounted from the tool.
  • Preferred embodiments of the present invention seek to improve the safety of pipe scanning tools.
  • the shielding member By providing at least one shielding member adapted to at least partially attenuate radiation from the radiation source which can be removably mounted relative to a body of the scanning apparatus and fixed in position relative to the radiation source in the first position thereof, wherein radiation from the source along at least one direction is caused to penetrate the shielding member in the first position but not in the second position, this provides the advantage of enabling the radiation source to be safely shielded even if the mechanism for returning the primary shielding of the source to its shielding position should become blocked or jammed.
  • the shielding member can be arranged such that it is brought into its first (i.e. shielding) position by means of a remotely operated vehicle (ROV), so that shielding of the radiation source can be put in place before the tool incorporating the invention is brought into the vicinity of any personnel. This in turn improves the safety of a pipe scanning apparatus incorporating the invention.
  • ROV remotely operated vehicle
  • the apparatus may further comprise biasing means for urging at least one said shielding member towards said first position thereof. This provides the advantage of reducing the force and/or energy required to activate the apparatus to place the source in a safe condition.
  • At least one said shielding member may be releasably attached to said biasing means. This provides the advantage of reducing the number of parts removed from the apparatus when the radiation source is removed with the shielding member attached thereto, thereby reducing the cost and complexity of the apparatus.
  • the apparatus may further comprise latching means for releasably retaining at least one said shielding member in said second position thereof.
  • At least one said shielding member may be releasably attached to said latching means.
  • At least one said shielding member may be adapted to be moved from a said second position thereof to a said first position thereof by remote control.
  • At least one said shielding member may be adapted to be moved from a said second position thereof to a said first position thereof by means of a remotely operated vehicle.
  • a scanning apparatus comprising:- a body for removably supporting a radiation source; drive means for rotating said radiation source relative to an object to be scanned; and a radiation shielding apparatus as defined above.
  • the apparatus may further comprise a radiation source.
  • Figure 1 is a perspective view of a rotating part of a scanning apparatus embodying the present invention
  • Figure 2 is a perspective view of a radiation source apparatus of Figure 1 with a shielding apparatus embodying the present invention mounted thereto in an open position;
  • Figure 3 is an end view of the radiation source and shielding apparatus of Figure 2;
  • Figure 4 is a view corresponding to Figure 2 with the shielding apparatus in a closed position thereof;
  • Figure 5 is an end view of the radiation source and shielding apparatus of Figure 4.
  • Figure 6 is a perspective view from above of the shielding apparatus of Figures 2 to 5; and Figure 7 is a perspective view from below of the shielding apparatus of Figure 6.
  • a scanning apparatus 30 for scanning undersea pipes has a rotary body 32 adapted to be rotatably attached to a pipe (not shown) to be scanned and having cradle 34 for supporting a gamma radiation source apparatus 35 for directing a beam of radiation into the pipe, and a drive apparatus (not shown) for rotating the source apparatus 35 relative to the pipe to scan the pipe.
  • a radiation shielding apparatus 36 embodying the present invention is mounted to the cradle 34 and is pivotable relative to the cradle about a pivot axis 38.
  • the shielding apparatus 36 has a shielding member 40 of dense gamma ray absorbing material such as tungsten alloy removably mounted to a body 42 by means of bolts 44.
  • a bracket 46 is mounted by means of bolts 48 to the shielding member 40 and has apertures 50 for receiving bolts for securely attaching the shielding member 40 to the radiation source apparatus 35 when in a closed position thereof as shown in Figures 4 and 5.
  • the shielding apparatus 36 has a latching mechanism (not shown) for retaining the shielding member 40 in its open position as shown in Figures 2 and 3, and biasing means in the form of a spring (not shown) urging the shielding member 40 towards its closed position as shown in Figures 4 and 5.
  • the latching mechanism is releasable by means of a first handle 52 which can be operated by a remotely operated vehicle.
  • a second handle 54 is accessible by a remotely operated vehicle to enable the shielding member 40 to be urged to its closed position if the force of the spring fails to bring the shielding member 40 to its closed position.
  • the bolts 44 are then removed to release the shielding member 40 from the body 42, and the source apparatus 35 is then released from the cradle 34 with the shielding member 40 firmly attached thereto and can be transported to a safe location for repair. In this manner, shielding can be brought into place by remote control before the source apparatus 35 is brought into the vicinity of any personnel.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Immunology (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

A radiation shielding apparatus (36) for a pipe scanning apparatus is disclosed. The shielding apparatus has a shielding member (40) for attenuating radiation from a radiation source apparatus (35) and is removably mounted to a body (34) of the scanning apparatus such that it is movable between a first position and a second position. A bracket (46) enables fixing of the shielding to the radiation source apparatus in the first position.

Description

RADIATION SHIELDING APPARATUS
The present invention relates to radiation shielding apparatus for a radiation source of a scanning apparatus and relates particularly, but not exclusively, to a shielding apparatus for a radiation source of an underwater scanning apparatus.
Pipe scanning tools exist for scanning underwater pipes and include a source of gamma radiation rotated relative to a pipe to be scanned. A known source apparatus for generating a beam of gamma radiation for such an apparatus has a housing of shielding material such as lead or tungsten alloy containing a gamma ray source such as a Cs 137 source. In use, the source apparatus is mounted to a cradle on a rotary part of the pipe scanning tool and the tool is mounted to a pipe. A retractable part of the shielding of the source apparatus is then retracted by remote control means such as a remotely operated vehicle (ROV) to enable a beam of radiation to penetrate the pipe. After use, the retractable part of the shielding is returned to its initial shielding position by remote control, the tool is recovered to a surface vessel and the source apparatus is dismounted from the tool. Preferred embodiments of the present invention seek to improve the safety of pipe scanning tools.
According to an aspect of the present invention, there is provided a radiation shielding apparatus for a scanning apparatus having a radiation source and drive means for rotating the radiation source relative to an object to be scanned by radiation from the radiation source, the radiation shielding apparatus comprising:- shielding means including at least one shielding member adapted to at least partially attenuate radiation from said radiation source passing through said shielding member; mounting means for removably mounting at least one said shielding member relative to a body of said scanning apparatus such that said shielding member is movable between a first position and a second position thereof; and fixing means for fixing at least one said shielding member in position relative to said radiation source in said first position thereof; wherein at least one said shielding member is arranged such that radiation from said source along at least one direction is caused to penetrate said shielding member in said first position thereof but not in said second position thereof.
By providing at least one shielding member adapted to at least partially attenuate radiation from the radiation source which can be removably mounted relative to a body of the scanning apparatus and fixed in position relative to the radiation source in the first position thereof, wherein radiation from the source along at least one direction is caused to penetrate the shielding member in the first position but not in the second position, this provides the advantage of enabling the radiation source to be safely shielded even if the mechanism for returning the primary shielding of the source to its shielding position should become blocked or jammed. In addition, the shielding member can be arranged such that it is brought into its first (i.e. shielding) position by means of a remotely operated vehicle (ROV), so that shielding of the radiation source can be put in place before the tool incorporating the invention is brought into the vicinity of any personnel. This in turn improves the safety of a pipe scanning apparatus incorporating the invention.
At least one said shielding member may be adapted to pivot relative to a body of the scanning apparatus between said first and second positions thereof. This provides the advantage of enabling the radiation shielding apparatus to be made from fewer moving parts, thereby improving its reliability.
The apparatus may further comprise biasing means for urging at least one said shielding member towards said first position thereof. This provides the advantage of reducing the force and/or energy required to activate the apparatus to place the source in a safe condition.
At least one said shielding member may be releasably attached to said biasing means. This provides the advantage of reducing the number of parts removed from the apparatus when the radiation source is removed with the shielding member attached thereto, thereby reducing the cost and complexity of the apparatus.
The apparatus may further comprise latching means for releasably retaining at least one said shielding member in said second position thereof.
At least one said shielding member may be releasably attached to said latching means.
At least one said shielding member may be adapted to be moved from a said second position thereof to a said first position thereof by remote control.
At least one said shielding member may be adapted to be moved from a said second position thereof to a said first position thereof by means of a remotely operated vehicle.
According to another aspect of the present invention, there is provided a scanning apparatus comprising:- a body for removably supporting a radiation source; drive means for rotating said radiation source relative to an object to be scanned; and a radiation shielding apparatus as defined above.
The apparatus may further comprise a radiation source.
A preferred embodiment of the invention will now be described, by way of example only and not in any limitative sense, with reference to the accompanying drawings, in which:-
Figure 1 is a perspective view of a rotating part of a scanning apparatus embodying the present invention;
Figure 2 is a perspective view of a radiation source apparatus of Figure 1 with a shielding apparatus embodying the present invention mounted thereto in an open position; Figure 3 is an end view of the radiation source and shielding apparatus of Figure 2;
Figure 4 is a view corresponding to Figure 2 with the shielding apparatus in a closed position thereof;
Figure 5 is an end view of the radiation source and shielding apparatus of Figure 4;
Figure 6 is a perspective view from above of the shielding apparatus of Figures 2 to 5; and Figure 7 is a perspective view from below of the shielding apparatus of Figure 6.
Referring to Figure 1 , a scanning apparatus 30 for scanning undersea pipes has a rotary body 32 adapted to be rotatably attached to a pipe (not shown) to be scanned and having cradle 34 for supporting a gamma radiation source apparatus 35 for directing a beam of radiation into the pipe, and a drive apparatus (not shown) for rotating the source apparatus 35 relative to the pipe to scan the pipe.
Referring to Figures 2 to 7, a radiation shielding apparatus 36 embodying the present invention is mounted to the cradle 34 and is pivotable relative to the cradle about a pivot axis 38. The shielding apparatus 36 has a shielding member 40 of dense gamma ray absorbing material such as tungsten alloy removably mounted to a body 42 by means of bolts 44. A bracket 46 is mounted by means of bolts 48 to the shielding member 40 and has apertures 50 for receiving bolts for securely attaching the shielding member 40 to the radiation source apparatus 35 when in a closed position thereof as shown in Figures 4 and 5.
The shielding apparatus 36 has a latching mechanism (not shown) for retaining the shielding member 40 in its open position as shown in Figures 2 and 3, and biasing means in the form of a spring (not shown) urging the shielding member 40 towards its closed position as shown in Figures 4 and 5. The latching mechanism is releasable by means of a first handle 52 which can be operated by a remotely operated vehicle. A second handle 54 is accessible by a remotely operated vehicle to enable the shielding member 40 to be urged to its closed position if the force of the spring fails to bring the shielding member 40 to its closed position.
In the event of blocking or jamming failure of the mechanism of the radiation source apparatus 35 for returning the primary shielding members 20, 22 to their closed positions, the first handle 52 of the shielding apparatus 36 is activated by means of a remotely operated vehicle to release the latching mechanism so that the shielding member 40 can be urged by the spring to its closed position, where it occupies the position which would otherwise be occupied by the primary shielding members 20, 22 to provide full shielding to the radiation source 6. The shielding member 40 is then fixed in this position by means of bolts inserted through the apertures 50 in bracket 46. The bolts 44 are then removed to release the shielding member 40 from the body 42, and the source apparatus 35 is then released from the cradle 34 with the shielding member 40 firmly attached thereto and can be transported to a safe location for repair. In this manner, shielding can be brought into place by remote control before the source apparatus 35 is brought into the vicinity of any personnel.
It will be appreciated by persons skilled in the art that the above embodiment has been described by way of example only, and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims.

Claims
A radiation shielding apparatus for a scanning apparatus having a radiation source and drive means for rotating the radiation source relative to an object to be scanned by radiation from the radiation source, the radiation shielding apparatus comprising:- shielding means including at least one shielding member adapted to at least partially attenuate radiation from said radiation source passing through said shielding member; mounting means for removably mounting at least one said shielding member relative to a body of said scanning apparatus such that said shielding member is movable between a first position and a second position thereof; and fixing means for fixing at least one said shielding member in position relative to said radiation source in said first position thereof; wherein at least one said shielding member is arranged such that radiation from said source along at least one direction is caused to penetrate said shielding member in said first position thereof but not in said second position thereof.
An apparatus according to claim 1 , wherein at least one said shielding member is adapted to pivot relative to a body of the scanning apparatus between said first and second positions thereof. An apparatus according to claim 1 or 2, further comprising biasing means for urging at least one said shielding member towards said first position thereof.
An apparatus according to claim 3, wherein at least one said shielding member is releasably attached to said biasing means.
An apparatus according to any one of the preceding claims, further comprising latching means for releasably retaining at least one said shielding member in said second position thereof.
An apparatus according to claim 5, wherein at least one said shielding member is releasably attached to said latching means.
An apparatus according to any one of the preceding claims, wherein at least one said shielding member is adapted to be moved from a said second position thereof to a said first position thereof by remote control.
An apparatus according to claim 7, wherein at least one said shielding member is adapted to be moved from a said second position thereof to a said first position thereof by means of a remotely operated vehicle.
A scanning apparatus comprising:- a body for removably supporting a radiation source; drive means for rotating said radiation source relative to an object to be scanned; and a radiation shielding apparatus according to any one of the preceding claims.
10. An apparatus according to claim 9, further comprising a radiation source.
PCT/GB2015/051883 2014-06-30 2015-06-29 Radiation shielding apparatus WO2016001636A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1411573.7 2014-06-30
GBGB1411573.7A GB201411573D0 (en) 2014-06-30 2014-06-30 Radiation shielding apparatus

Publications (1)

Publication Number Publication Date
WO2016001636A1 true WO2016001636A1 (en) 2016-01-07

Family

ID=51410332

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2015/051883 WO2016001636A1 (en) 2014-06-30 2015-06-29 Radiation shielding apparatus

Country Status (2)

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GB (2) GB201411573D0 (en)
WO (1) WO2016001636A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719926A (en) * 1952-08-15 1955-10-04 Isotope Products Ltd Method and apparatus for radiographic examination of hollow articles
DE102011077304A1 (en) * 2011-06-09 2012-12-13 Endress + Hauser Gmbh + Co. Kg Source holder
US20130114788A1 (en) * 2010-07-01 2013-05-09 Smiths Heimann Gmbh Radiation protection curtain
GB2496736A (en) * 2011-11-02 2013-05-22 Johnson Matthey Plc Scanning method and apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875417A (en) * 1967-04-27 1975-04-01 Industrial Nucleonics Corp Nucleonic measuring apparatus
US3697755A (en) * 1969-01-17 1972-10-10 Measurex Corp Enclosure with radiation source having fail safe shutter
US4580053A (en) * 1983-01-17 1986-04-01 William B. Wilson Mfg. Co. Backscatter detection inspection apparatus for tubular goods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719926A (en) * 1952-08-15 1955-10-04 Isotope Products Ltd Method and apparatus for radiographic examination of hollow articles
US20130114788A1 (en) * 2010-07-01 2013-05-09 Smiths Heimann Gmbh Radiation protection curtain
DE102011077304A1 (en) * 2011-06-09 2012-12-13 Endress + Hauser Gmbh + Co. Kg Source holder
GB2496736A (en) * 2011-11-02 2013-05-22 Johnson Matthey Plc Scanning method and apparatus

Also Published As

Publication number Publication date
GB201511328D0 (en) 2015-08-12
GB2532102A (en) 2016-05-11
GB2532102B (en) 2017-05-10
GB201411573D0 (en) 2014-08-13

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