Device and method for non-invasive detection of hazardous materials in the aquatic environment

Patent metadata

Field	Value
Publication number	US-10126257-B2
Application number	US-201515509013-A
Country	US
Kind code	B2
Filing date	Jun 8, 2015
Priority date	Sep 7, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The present invention is a device and method for the non-invasive detection of hazardous materials in an aquatic environment, wherein the device comprises a sealed housing, in which there is a fast neutron generator ( 101 ) surrounded by α particle detectors ( 106 ), and gamma quantum detector ( 111 ), wherein the fast neutron generator ( 101 ) emits neutrons in the direction of the tested object ( 107 ) through the neutron and/or gamma quanta guide ( 108 ), and the gamma quanta detector records gamma quanta emitted by the nuclei of the tested object ( 107 ) transmitted through neutron and/or gamma quanta guide ( 110 ).

First claim

The invention claimed is:

1. An apparatus for the non-invasive detection of hazardous materials in an aquatic environment comprising a scaled housing, in which there is a fast neutron generator surrounded by a particle detectors, and gamma quanta detector, wherein the fast neutron generator emits neutrons in the direction of a tested object and the gamma quanta detector detects gamma quanta emitted by nuclei of the tested object, characterized in that said apparatus further comprises a neutron guide connected with the fast neutron generator and a gamma quanta guide with the gamma quanta detector wherein each of the neutron guide and gamma quanta guide are made of a material comprising: stainless steel, aluminum, carbon fibers.

2. The device according to claim 1 , characterized in that each of the neutron guide and gamma quanta guide are in the form of a cylinder with closed bases.

3. The device according to claim 1 , characterized in that inside each of the neutron guide and gamma quanta guide there is a vacuum or the guides are filled with a gas.

4. The device according to claim 1 , characterized in that each of the neutron guide and gamma quanta guide are covered from the inside with a thin layer of neutron-reflecting material.

5. The device according to claim 1 , characterized in that the gamma quanta detector is a semiconductor or scintillator detection system.

6. The device according to claim 1 , characterized in that inside the neutron guide and gamma quanta guide there is a vacuum or the guides are filled with a gas that is air, helium, or argon.

7. The device according to claim 1 , characterized in that the neutron guide and gamma quanta guide are covered from the inside with a thin layer of neutron-reflecting material that is graphite.

8. A method for non-invasive detection of hazardous materials in an aquatic environment, characterized in said method comprises the following steps:
a) generating fast neutrons with a specific energy range from 5 MeV to 20 MeV using neutron generator,
b) collimation of fast neutrons generated in step a) in the direction of an object,
c) detecting gamma quanta emitted in the transition from the excited state to the ground state of nuclei of the object, and measuring the position of the neutron guide and the gamma quanta guide and the time of gamma quanta reaction in the gamma quanta detector relative to the signal from a detector,
wherein the generated fast neutrons and gamma quanta emitted are each transmitted to respective neutron and gamma quanta guides.

9. The method according to claim 8 , characterized in that the gamma quanta are detected in coincidence with a particles detected by a detector placed opposite to the guide.

10. The method according to claim 8 , further comprising rejecting signals from the gamma quanta detector that are in coincidence with signals of a particle detectors.

11. An apparatus for the non-invasive detection of hazardous materials in an aquatic environment comprising a sealed housing, in which there is a fast neutron generator surrounded by a particle detectors, and gamma quanta detector, wherein the fast neutron generator emits neutrons in the direction of a tested object and the gamma quanta detector detects gamma quanta emitted by nuclei of the tested object, characterized in that said apparatus further comprises a neutron and/or gamma quanta guide, connected with fast neutron generator and a neutron guide and/or gamma quanta guide with the gamma quanta detector, characterized in that the distance between the neutron guide and/or gamma quanta guide coupled to the fast neutron generator and the neutron guide and/or gamma quanta guide connected to the gamma quanta detector are changeable, wherein the angle between the neutron guide and/or gamma quanta guide of the fast neutron generator, and the neutron guide and/or gamma quanta guide of the gamma quanta detector is in the range from ˜0 to ˜90 degrees.

12. An apparatus for the non-invasive detection of, hazardous materials in an aquatic environment comprising a sealed housing, in which there is a fast neutron generator surrounded by α particle detectors, and gamma quanta detector, wherein the fast neutron generator emits neutrons in the direction of a tested object and the gamma quanta detector detects gamma quanta emitted by nuclei of the tested object, characterized in that said apparatus further comprises a neutron guide connected with the fast neutron generator and a gamma quanta guide with the gamma quanta detector wherein the fast neutron generator has in a position opposed to the neutron guide one of the α particle detectors and in a position perpendicular to the guide other of the α particle detectors.

13. An apparatus for the non-invasive detection of hazardous materials in an aquatic environment comprising a scaled housing, in which there is a fast neutron generator surrounded by α particle detectors, and gamma quanta detector, wherein the fast neutron generator emits neutrons in the direction of a tested object and the gamma quanta detector detects gamma quanta emitted by nuclei of the tested object, characterized in that said apparatus further comprises a neutron and/or gamma quanta guide, connected with fast neutron generator and a neutron guide and/or converted gamma quanta guide with the gamma quanta detector, characterized in that each of the neutron guide and/or gamma quanta guide are in the form of a cylinder with closed bases that are telescopic.

Assignees

• Univ Jagiellonski

Inventors

• Silarski Michal
• Moskal Pawel

Classifications

• G01N23/222 Primary

  using neutron activation analysis [NAA] · CPC title

• G01N2223/637

  liquid · CPC title

• G01N2223/652

  impurities, foreign matter, trace amounts · CPC title

• G01N33/18

  Water · CPC title

• G01V5/0016

  Physics · mapped topic