GB1409263A - Neutron beam collimators - Google Patents
Neutron beam collimatorsInfo
- Publication number
- GB1409263A GB1409263A GB1237372A GB1237372A GB1409263A GB 1409263 A GB1409263 A GB 1409263A GB 1237372 A GB1237372 A GB 1237372A GB 1237372 A GB1237372 A GB 1237372A GB 1409263 A GB1409263 A GB 1409263A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- neutrons
- neutron
- collisions
- lead
- 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
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
-
- 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
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/12—Laminated shielding materials
- G21F1/125—Laminated shielding materials comprising metals
Abstract
1409263 Collimating neutron beams; moderating neutrons; neutron shielding ELLIOTT BROS (LONDON) Ltd 23 Feb 1973 [16 March 1972] 12373/72 Headings G6P and G6R A neutron beam collimator comprises a body containing tungsten, for moderating neutrons by inelastic collisions, a flow neutron absorber in intimate admixture with the tungsten to reduce collisions of slow neutrons therewith, and hydrogenous material for further moderating the neutrons by elastic collisions to reduce them to thermal energies and for capturing thermal neutrons, and a material having a density of at least 10 gm./cm.<SP>3</SP> for attenuating γ-radiation arising from the neutron capture, the body including a bore to define the cross-section of the emergent beam. In one embodiment (as shown), the collimator 24 comprises a matrix 40 in three layers 34, 36, 38. Layer 34 comprises tungsten powder mixed with boron carbide powder; layer 36 comprises polyethylene granules and may also contain boron carbide mixed with the matrix bonding agent, e.g. epoxy resin, or forming a coating on the granules; and layer 38 comprises lead shot or powder. In a modification, layer 38 comprises solid lead. In another modification, lead may form the bonding agent of layer 34. In a further modification, nickel powder is added to the layer 36. In a second embodiment (Fig. 3, not shown), the matrix 40 contains a uniform dispersion of the loading materials previously mentioned in relation to Fig. 2. The collimator is intended for use with a neutron radiation therapy apparatus (Fig. 1, not shown) in which a neutron source (10) is surrounded by a shield (12) comprising an inner layer (14) of iron which slows down primary (15 MeV) neutrons by inelastic collisions, an intermediate hydrogenous layer (16) of polyethylene and boron carbide which, by elastic collisions, moderates the neutrons to thermal energies, the latter then being captured, and an outer layer (20) of lead to attenuate γ-radiation produced in the neutron capture processes. The outer layer (20) overlies a stainless steel casing (18) which contains the intermediate layer.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1237372A GB1409263A (en) | 1972-03-16 | 1972-03-16 | Neutron beam collimators |
DE19732311533 DE2311533A1 (en) | 1972-03-16 | 1973-03-08 | NEUTRON BEAM COLLIMATOR |
JP2786573A JPS491997A (en) | 1972-03-16 | 1973-03-09 | |
NL7303615A NL7303615A (en) | 1972-03-16 | 1973-03-15 | |
FR7309309A FR2176097B1 (en) | 1972-03-16 | 1973-03-15 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1237372A GB1409263A (en) | 1972-03-16 | 1972-03-16 | Neutron beam collimators |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1409263A true GB1409263A (en) | 1975-10-08 |
Family
ID=10003354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1237372A Expired GB1409263A (en) | 1972-03-16 | 1972-03-16 | Neutron beam collimators |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS491997A (en) |
DE (1) | DE2311533A1 (en) |
FR (1) | FR2176097B1 (en) |
GB (1) | GB1409263A (en) |
NL (1) | NL7303615A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117964A (en) * | 1982-04-02 | 1983-10-19 | Amersham Int Plc | Radiation shielding bricks |
EP2355108A1 (en) * | 2010-02-08 | 2011-08-10 | Technische Universität München | Shielding material and shielding element for shielding gamma and neutron radiation |
CN106110516A (en) * | 2016-06-17 | 2016-11-16 | 深圳市奥沃医学新技术发展有限公司 | A kind of imaging collimation body, treatment head and therapeutic equipment |
EP3566748A4 (en) * | 2017-06-05 | 2019-12-11 | Neuboron Medtech Ltd. | Beam shaping assembly for neutron capture therapy |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5329240B2 (en) * | 1974-05-30 | 1978-08-19 | ||
CH576263A5 (en) * | 1974-11-05 | 1976-06-15 | Flocee Rune | Shaping a radiation beam for radiotherapy - using a deformable block of material containing a heavy metal powder |
JPS6415309A (en) * | 1987-07-08 | 1989-01-19 | Agency Ind Science Techn | Production of metal fine powder |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH283222A (en) * | 1950-04-22 | 1952-05-31 | Bbc Brown Boveri & Cie | Blende zur Abschirmung von Röntgenstrahlen. |
FR1245292A (en) * | 1959-12-28 | 1960-11-04 | Ici Ltd | Protective material against neutron radiation |
DE1948632C3 (en) * | 1969-09-26 | 1973-12-20 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Radiation facility for neutron therapy |
-
1972
- 1972-03-16 GB GB1237372A patent/GB1409263A/en not_active Expired
-
1973
- 1973-03-08 DE DE19732311533 patent/DE2311533A1/en not_active Ceased
- 1973-03-09 JP JP2786573A patent/JPS491997A/ja active Pending
- 1973-03-15 NL NL7303615A patent/NL7303615A/xx not_active Application Discontinuation
- 1973-03-15 FR FR7309309A patent/FR2176097B1/fr not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117964A (en) * | 1982-04-02 | 1983-10-19 | Amersham Int Plc | Radiation shielding bricks |
EP2355108A1 (en) * | 2010-02-08 | 2011-08-10 | Technische Universität München | Shielding material and shielding element for shielding gamma and neutron radiation |
WO2011095642A1 (en) * | 2010-02-08 | 2011-08-11 | Technische Universität München | Shielding material and shielding element for shielding gamma and neutron radiation |
CN106110516A (en) * | 2016-06-17 | 2016-11-16 | 深圳市奥沃医学新技术发展有限公司 | A kind of imaging collimation body, treatment head and therapeutic equipment |
EP3566748A4 (en) * | 2017-06-05 | 2019-12-11 | Neuboron Medtech Ltd. | Beam shaping assembly for neutron capture therapy |
US11559705B2 (en) | 2017-06-05 | 2023-01-24 | Neuboron Medtech Ltd. | Neutron capture therapy system |
Also Published As
Publication number | Publication date |
---|---|
FR2176097B1 (en) | 1978-06-23 |
DE2311533A1 (en) | 1973-09-27 |
JPS491997A (en) | 1974-01-09 |
FR2176097A1 (en) | 1973-10-26 |
NL7303615A (en) | 1973-09-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |