US3260847A - Neutron source - Google Patents

Neutron source Download PDF

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Publication number
US3260847A
US3260847A US200258A US20025862A US3260847A US 3260847 A US3260847 A US 3260847A US 200258 A US200258 A US 200258A US 20025862 A US20025862 A US 20025862A US 3260847 A US3260847 A US 3260847A
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Prior art keywords
container
neutron
emitter
particles
target
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Expired - Lifetime
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US200258A
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English (en)
Inventor
Amiel Saadia
Nir Aharon
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Yeda Research and Development Co Ltd
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Yeda Research and Development Co Ltd
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G4/00—Radioactive sources
    • G21G4/02—Neutron sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H6/00—Targets for producing nuclear reactions

Definitions

  • the present invention relates to improved alpha-neutron sources, i.e. neutron sources comprising an emitter of a-particles (for short a-Cmiiifil) and a target material capable of emitting neutrons upon incidence of the uparticles.
  • neutron sources comprising an emitter of a-particles (for short a-Cmiiifil) and a target material capable of emitting neutrons upon incidence of the uparticles.
  • target materials used in known alpha-neutron sources are Li, Be, B and F.
  • the alpha-neutron emitter comprises a radioactive emitter of tat-particles having an energy of at least 4 mev. and an oxygenous target mate rial enriched in 0 means being provided for bringing at will the source and the target to such a proximity as to set off neutron emission and means being provided to sever them at will so as to interrupt the neutron emission.
  • eflicient n-sources are obtained where the target material contains at least 50% of 0 calculated on the total content of oxygen.
  • the target material of the neutron source according to the invention may be solid, liquid or gaseous.
  • solid materials are oxides in which the metal may, if desired, be chosen from the group of metals capable of emitting neutrons upon incidence of tat-particles.
  • An example of such a metal is beryllium and the target would in such a case be Be O
  • a suitable liquid target is H O or water enriched in respect of 0
  • Suitable gaseous targets are 0 as well as gaseous compounds, containing 0 e.g. C0
  • FIGURE 1 is an elevational schematical cross-sectional 3,260,847 Patented July 12, 1966 ice view through an alpha-neutron source according to the invent-ion.
  • 11 is a glass bulb of about 2 cm. diameter, in communication with an inlet-tube 12, provided with a stopcock 13, and an outlet tube 14, provided with a stopcock 15.
  • a carrier rod 17 coated at its lower end with a coating of a radioactive emitter 18 of alpha-particles of suit-able energy.
  • an oxygenous liquid 19 such as water, enriched in 0"
  • the oxygenous liquid is removed from bulb 11 through stopcock 15.
  • Example 1 About 1 curie of Th in equilibrium with its decay products is introduced into a glass tube and covered with 2.0 cc. of water in which the 0 content amounts to of the total oxygen. This source will emit approximately 3.10 neutrons per second. When no neutron emission is required, the thorium can be separated from the water by mere distillation or displacement of the water by means of an inert liquid and the two way components of the neutron source can be stored separately.
  • Example 2 About 10 me. of P0 is deposited on a Pt-wire and enclosed in an evacuated glass tube measuring about 2 cm. in diameter and comprising a control-valve for the admittance and discharge of gas. Pure oxygen gas cont-aining of 0 is introduced into the tube through the valve.
  • This alpha-neutron source will emit about 5.10 neutrons per second.
  • the neutron emission can be interrupted by evacuating the oxygen through the valve.
  • a neutron source comprising a container, a solid radioactive emitter of tat-particles which have an energy of at least 4 mev., means providing said radioactive emitter of a-particles in the interior of said container, a fluid oxygenous target material enriched in O atoms filling at least a portion of said container and in contact with said radioactive emitter of u-particles, and valve means extending through the wall of said container for draining said fluid oxygenous target material from said container, thereby to sever the said a-emitter from said target to interrupt neutron emission at will.
  • a neutron source comprising a container, a solid radioactive emitter of a-particles which have an energy of at least 4 mev., means providing said radioactive emitter of tat-particles in the interior of said container, a fluid oxygenous target material enriched in O atoms filling at least a portion of said container and in contact with said radioactive emitter of tat-particles, and valve means extending through the wall of said container for draining said fluid oxygenous target material from said container, thereby to sever the said a-emitter from said target to interrupt neutron emission at will, and second valve means in said wall of said container for admitting said fluid oxygenous target material into said container.
  • the neutron source substantially as set forth in claim 2, wherein said fluid comprises water having an O content enriched to approximate 80% of the total oxygen of said water.
  • the neutron source substantially as set forth in claim 2, wherein said fluid comprises oxygen gas containing approximately 90% of 0 References Cited by the Examiner UNITED STATES PATENTS 1/1959 Reardon et a1. 4/1959 Birden.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Particle Accelerators (AREA)
  • Measurement Of Radiation (AREA)
US200258A 1961-06-06 1962-06-05 Neutron source Expired - Lifetime US3260847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL1559361 1961-06-06

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US3260847A true US3260847A (en) 1966-07-12

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US (1) US3260847A (fr)
FR (1) FR1324055A (fr)
GB (1) GB933429A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571595A (en) * 1969-04-15 1971-03-23 Atomic Energy Commission Variable rate neutron source
FR2233683A1 (en) * 1973-06-15 1975-01-10 Commissariat Energie Atomique Neutrons source uses alpha particle emitter and oxygen 18 - neutron flux controlled by isotope quantity percentage or coupling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868990A (en) * 1955-12-12 1959-01-13 William A Reardon Neutron source
US2883553A (en) * 1955-10-21 1959-04-21 John H Birden Fabrication of neutron sources

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883553A (en) * 1955-10-21 1959-04-21 John H Birden Fabrication of neutron sources
US2868990A (en) * 1955-12-12 1959-01-13 William A Reardon Neutron source

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571595A (en) * 1969-04-15 1971-03-23 Atomic Energy Commission Variable rate neutron source
FR2233683A1 (en) * 1973-06-15 1975-01-10 Commissariat Energie Atomique Neutrons source uses alpha particle emitter and oxygen 18 - neutron flux controlled by isotope quantity percentage or coupling

Also Published As

Publication number Publication date
FR1324055A (fr) 1963-04-12
GB933429A (en) 1963-08-08

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