Target for proton-beam or neutron-beam irradiation and method for generating radioactive substance using same

Patent metadata

Field	Value
Publication number	US-2021120661-A1
Application number	US-201816620628-A
Country	US
Kind code	A1
Filing date	Jun 6, 2018
Priority date	Jun 9, 2017
Publication date	Apr 22, 2021
Grant date	—

Abstract

An object of the present invention is to realize a target, for neutron-beam or proton-beam irradiation, that can withstand prolonged beam irradiation. A target for proton-beam or neutron-beam, comprising a graphite film (A) having a thermal conductivity of 500 W/mK or more in a direction parallel to an a-b plane of a graphite layer at 25° C.; and a layer (B) of a starting material for producing a radioactive substance, and being a laminate of the graphite film (A) and the layer (B). A density of the graphite film (A) is preferably 1.8 to 2.26 g/cm 3 . A tensile strength of the graphite film (A) is preferably 5 MPa or more.

First claim

1 . A target for proton-beam or neutron-beam irradiation, comprising:
a graphite film (A) having a thermal conductivity of 500 W/mK or more at 25° C. in a direction parallel to an a-b plane of a graphite layer; and a layer (B) of a starting material for producing a radioactive substance, wherein the target is a laminate of the graphite film (A) and the layer (B).

2 . The target according to claim 1 , wherein a density of the graphite film (A) is 1.8 to 2.26 g/cm 3 .

3 . The target according to claim 1 , wherein a tensile strength of the graphite film (A) is 5 MPa or more.

4 . The target according to claim 1 ,
wherein a ratio RG/RC is 4 or more, and wherein RG is a Raman band intensity appearing at 1575 to 1600 cm −1 and RC is a Raman band intensity appearing at 1330 to 1360 cm −1 , each obtained from a measurement of the graphite film (A) by Raman spectroscopy.

5 . The target according to claim 1 , wherein a thickness of the graphite film (A) is 0.1 to 50 μm.

6 . The target according to claim 1 , wherein the starting material is a metal and/or a metal oxide.

7 . The target according to claim 1 , wherein the starting material is molybdenum-100 metal and/or an oxide of molybdenum-100 metal.

8 . The target according to claim 7 , wherein the starting material further comprises a molybdenum isotope metal and/or an oxide of a molybdenum isotope.

9 . The target according to claim 1 , further comprising a metal layer (C), wherein the graphite film (A) and the layer (B) are laminated via the metal layer (C).

10 . The target according to claim 9 , wherein the metal layer (C) is at least one selected from the group consisting of aluminum, titanium, nickel, iron, copper, tantalum, tungsten, gold, silver, platinum, and ruthenium.

11 . The target according to claim 9 , wherein a thickness of the metal layer (C) is 1 μm or less.

12 . A method for generating a radioactive substance, comprising irradiating the target according to claim 1 with a proton beam or a neutron beam.

Assignees

• Kaneka Corp

Inventors

• Tatami Atsushi
• Tachibana Masamitsu
• Murakami Mutsuaki

Classifications

• G21G1/06

  by neutron irradiation · CPC title

• G21G1/10

  by bombardment with electrically charged particles (irradiation devices G21K5/00) · CPC title

• G21K5/08

  Holders for targets or for other objects to be irradiated · CPC title

• H05H6/00 Primary

  Targets for producing nuclear reactions (supports for targets or objects to be irradiated G21K5/08 {; preparation of tritium C01B4/00; targets, e.g. pellets for fusion reactions by laser or charged particles beam injection H05H1/22}) · CPC title

• G21G4/08

  specially adapted for medical application (radiation therapy using radioactive sources A61N5/10) · CPC title