Apparatus for analyzing free-flowing material

• US 4,024,393 A
• Filed: 03/29/1976
• Issued: 05/17/1977
• Est. Priority Date: 03/29/1975
• Status: Expired due to Term

• Current Assignee: Gesellschaft Fur Kernforschung mbH
• Original Assignee: Gesellschaft FUER Kernforschung
• Inventors: Braun, Hartmut, Hartung, Walter, Riffel, Fritz
• Primary Examiner(s): Dixon, Harold A.
• Application Number:
  US05/671,371
• Time in Patent Office: 414 Days
• Field of Search: 222/368, 222/362, 250/303, 250/306, 250/308, 250/363, 250/364, 250/436, 250/432, 250/499, 250/255
• US Class Current: 376/159
• CPC Class Codes: G01N 2223/01 by radioactivity, nuclear decay
• CPC Class Codes: G01N 2223/0745 neutron-gamma activation analysis
• CPC Class Codes: G01N 2223/202 isotopes
• CPC Class Codes: G01N 2223/635 fluids, granulates
• CPC Class Codes: G01N 23/2204 Specimen supports therefor; Sample conveying means therefore
• CPC Class Codes: G01N 23/222 using neutron activation analysis [NAA]

Abstract

An apparatus for analyzing flowable material in intermittent sequence comprises a hollow dosing sphere having a predetermined inner volume for forming samples of constant volume of the material introduced thereinto; a hollow radiation sphere connected to the outlet of the hollow dosing sphere; a radiation source supported within and centrally with respect to the hollow radiation sphere for a homogeneous activation of the sample introduced thereinto from the hollow dosing sphere; a hollow measuring sphere connected to the outlet of the hollow radiation sphere; and a detector arranged in the hollow measuring sphere for sensing the activity of the irradiated sample introduced thereinto from the hollow radiation sphere.

Claims

1. In an apparatus for analyzing flowable material in intermittent sequence;

comprising

a. a hollow dosing sphere having an inlet, an outlet and a predetermined inner volume for forming samples of constant volume of the material introduced into said hollow dosing sphere through its inlet;

b. a hollow radiation sphere having an inlet operatively connected to the outlet of said hollow dosing sphere and an outlet;

c. a radiation source supported within and centrally with respect to said hollow radiation sphere for a homogeneous activation of the sample introduced into said hollow radiation sphere from said hollow dosing sphere;

d. a hollow measuring sphere having an inlet operatively connected to the outlet of said hollow radiation sphere and an outlet;

e. a detector arranged in said hollow measuring sphere for sensing the activity of the irradiated sample introduced into said hollow measuring sphere from said hollow radiation sphere; and

f. material guide means for combining said hollow dosing sphere, said hollow radiation sphere and said hollow measuring sphere into a structural unit.

2. An apparatus as defined in claim 1, further comprising a first hollow inner sphere supported concentrically within said hollow dosing sphere and a second hollow inner sphere supported concentrically within said hollow radiation sphere;

said second hollow inner sphere accommodating said radiation source; and

radiation source means positioned in said second hollow inner sphere.

3. An apparatus as defined in claim 2, further comprising a first conical cap secured externally to the top of said first hollow inner sphere and being aligned with the inlet of said hollow dosing sphere and a second conical cap secured externally to the top of said second hollow inner sphere and being aligned with the inlet of said hollow radiation sphere.

4. An apparatus as defined in claim 2, further comprising an axially hollow support bar securing said second hollow inner sphere to said material guide means;

said radiation source being movably positioned within said axially hollow support bar.

5. An apparatus as defined in claim 1, further comprising flow control means supported between said hollow dosing sphere and said hollow radiation sphere and between said hollow radiation sphere and said hollow measuring sphere and at the outlet of said hollow measuring sphere;

said spheres being in a superposed arrangement;

said material being displaceable by gravity from any of said hollow spheres as a function of the setting of the respective flow control means.

6. An apparatus as defined in claim 5, wherein said flow control means comprise gates each having the shape of a spherical segment and each being arranged to close and to open the respective said outlets;

said outlets being positioned, respectively, at the lowest location of said hollow dosing sphere, said hollow radiation sphere and said hollow measuring sphere;

further comprising support means for pivotally securing said gates to said material guide means;

said support means extending through said material guide means; and

means for actuating said support means externally of said material guide means for pivoting said gates.

7. An apparatus as defined in claim 5, wherein said measuring sphere has a spherical configuration solely at its lower portion.

8. An apparatus as defined in claim 5, further comprising a charging funnel supported above and connected to the inlet of said hollow dosing sphere;

said charging funnel having a neck portion; and

gate means for opening and closing said neck portion for controlling the flow of material through said charging funnel.

9. An apparatus as defined in claim 5, wherein said material guide means comprises a guide tube assembly and means for supporting said hollow spheres vertically spaced from one another within said guide tube assembly.

10. An apparatus as defined in claim 9, further comprising radiation shield means disposed in said guide tube assembly between said hollow dosing sphere and said hollow radiation sphere and between said hollow radiation sphere and said hollow measuring sphere;

said radiation shield means being positioned for preventing radiation emanating from said hollow radiation sphere from directly reaching said hollow dosing sphere and said hollow measuring sphere;

said radiation shield means being further disposed without impeding the flow of the material in the apparatus.

11. An apparatus as defined in claim 10, wherein said radiation shield means comprises a first cylinder positioned in said guide tube assembly coaxially therewith and spaced from walls of said guide tube assembly, said first cylinder being disposed between said hollow dosing sphere and said hollow radiation sphere and having a conical terminus axially aligned with the outlet of said hollow dosing sphere;

a second cylinder positioned in said guide tube assembly coaxially therewith between said first cylinder and said hollow radiation sphere;

said second cylinder having means defining a throughgoing axial opening including a funnel-shaped enlargement surrounding a lower portion of said first cylinder;

the throughgoing opening of said second cylinder merging into said hollow radiation cylinder;

a third cylinder positioned in said guide tube assembly coaxially therewith between said hollow radiation sphere and said hollow measuring sphere, said third cylinder having means defining a throughgoing axial opening having a funnel-like enlarged lower terminus; and

a fourth cylinder positioned in said guide tube assembly coaxially therewith and spaced from walls of said guide tube assembly, said fourth cylinder being disposed between said third cylinder and said hollow measuring sphere and having a conical terminus surrounded by the funnel-like terminus of the opening in said third cylinder and being axially aligned with the throughgoing opening in said third cylinder and the outlet of said hollow radiation sphere.

12. An apparatus as defined in claim 9, further comprising a support stand for vertically positioning said guide tube assembly and radiation shield means surrounding said guide tube assembly.