Neutron spectrum standard专利检索-快中子中子化学元素和化合物专利检索查询-专利查询网

Neutron spectrum standard

阅读：661发布：2021-03-20

专利汇可以提供Neutron spectrum standard专利检索，专利查询，专利分析的服务。并且In order to carry out experiments and to make measurements of a fast neutron flux it is desirable to have an enclosure, accessible from outside, in which a fast neutron flux of fairly consistent spectrum can be produced, using any convenient irradiation source. The invention provides this apparatus which comprises concentric inner and outer hollow spheres of, respectively, natural uranium and of boron carbide, so that on irradiation in a thermal flux, fast neutrons emanating from the UNAT appear within the inner sphere to the exclusion of thermal neutrons, which are absorbed by the boron carbide sphere. The interior of the latter forms an enclosure in which experiments can be introduced and mounted conveniently on a composite closure plug, which protrudes into the enclosure.，下面是Neutron spectrum standard专利的具体信息内容。

权利要求

2. Apparatus as claimed in claim 1 comprising a member of neutron moderating material having a cavity therein, means for supporting within the cavity a hollow sphere of natural uranium, a spherical shell of thermal neutron absorber material within the hollow sphere, coincident access ports in the sphere and the shell, an elongated member adapted to close said ports with plugs of appropriate material and serving also to support within the enclosure fast neutron-responsive devices.

3. Apparatus as claimed in claim 2 in which the hollow sphere of natural uranium is supported concentrically within a spherical cavity in a block of neutron moderating material which surrounds the hollow sphere.

4. Apparatus as claimed in claim 2, in which the hollow sphere is supported from below by a vertical cylinder, each end of which engages annular grooves formed respectively in the inner surface of the spherical cavity and in the outer surface of the natural uranium sphere; the length of the cylinder being such that the centre of the sphere substantially coincides with that of the cavity.

5. Apparatus as claimed in claim 3 having combined in the elongated member composite plugs of natural uranium and of boron carbide, effecting closure of access ports in the sphere and the shell respectively.

6. Apparatus as claimed in claim 5 in which the elongated member also incorporates a plug of moderating material which closes an access port in the member of moderating material.

7. Apparatus as claimed in claim 1 comprising a member of neutron moderating material having a hollow cavity therein of spherical form, a hollow sphere of natural uranium supported substantially concentric with the hollow cavity, a spherical shell of thermal neutron absorber within the hollow sphere defining an enclosure for the reception of experiments, coincident access ports in the member, the hollow sphere and the shell, a composite closure device extending from outside said member through the access ports and into the enclosure and providing plugs in said access ports, the neutronic properties of each plug matching those of the member whose access port it closes.

8. Apparatus for producing from a thermal neutron flux a flux having a fast neutron spectrum for use as a standard spectrum, the apparatus comprising concentric, inner and outer hollow spherical shells of respectively thermal neutron absorber material and natural uranium, coincident apertures in the shells, a closure member for the coincident apertures, said closure member comprising a composite plug including, end to end, a first inner portion of thermal neutron absorber material and a second contiguous outer portion of natural uranium, said portions being of a length equal to the thickness of the respective inner and outer shells, and support means extending from the inner portion of the composite plug for supporting a neutron responsive device from the first, inner, portion of the composite plug.

9. Apparatus as claimed in claim 8 including an outer block of moderator material, said outer block having a spherical cavity, and means for supporting the shells within the cavity concentrically with the outer wall of the shell of natural uranium spaced from the inner face of the spherical cavity.

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