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1. (WO2017202793) SYSTEM AND METHOD OF STABILIZATION OF A GAMMA AND NEUTRON DETECTING DEVICE
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What is claimed is:

1. A method of stabilizing a spectroscopic gamma and neutron detecting device, the method comprising:

a. measuring a pulse height spectrum of neutron radiation using a spectroscopic gamma and neutron detecting device that includes a scintillation detector that detects gamma and thermal neutron radiation, the scintillation detector including signal detection and amplification electronics;

b. determining a thermal neutron peak position in the neutron pulse height

spectrum originating from cosmic ray background radiation;

c. monitoring the thermal neutron peak position in the neutron pulse height

spectrum during operation of the spectroscopic gamma and neutron detecting device; and

d. adjusting the signal detection and amplification electronics based on the

thermal neutron peak position in the neutron pulse height spectrum, thereby stabilizing the spectroscopic gamma and neutron detecting device.

2. The method of Claim 1, wherein the scintillation detector comprises a scintillation crystal including at least 2 atomic% Li-6.

3. The method of Claim 2, wherein the scintillation crystal is a Cerium (Ce)-doped

Elpasolite having a chemical formula A2LiLnX6:Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium (Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

4. The method of Claim 3, wherein the scintillation crystal is any one of Cs2LiYCl6.'Ce (CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or Cs2LiYBr6:Ce (CLYB).

5. The method of Claim 1, wherein determining the thermal neutron peak position in the neutron pulse height spectrum includes pulse shape discrimination (PSD) that distinguishes between gamma and neutron radiation.

6. A spectroscopic gamma and neutron detecting device comprising:

a. a scintillation detector that detects gamma and thermal neutron radiation, the scintillation detector including signal detection and amplification electronics; and

b. a stabilization module configured to:

i. measure a pulse height spectrum of neutron radiation;

ii. determine a thermal neutron peak position in the neutron pulse height spectrum originating from cosmic ray background radiation;

iii. monitor the thermal neutron peak position in the neutron pulse height spectrum during operation of the spectroscopic gamma and neutron detecting device; and

iv. adjust the signal detection and amplification electronics based on the thermal neutron peak position in the neutron pulse height spectrum, thereby stabilizing the spectroscopic gamma and neutron detecting device.

7. The device of Claim 6, wherein the scintillation detector comprises a scintillation crystal including at least 2 atomic% Li-6.

8. The device of Claim 7, wherein the scintillation crystal is a Cerium (Ce)-doped

Elpasolite having a chemical formula A2LiLnX6.Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium (Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

9. The device of Claim 8, wherein the scintillation crystal is one of Cs2LiYCl6.'Ce

(CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or Cs2LiYBr6:Ce (CLYB).

10. The device of Claim 6, wherein the stabilization module is further configured to

include pulse shape discrimination (PSD) that distinguishes between gamma and neutron radiation to determine the thermal neutron peak position in the neutron pulse height spectrum.

11. A computer program product carrying a computer program which, when loaded into a programmable processor, executes the method of:

a. measuring a pulse height spectrum of neutron radiation using a spectroscopic gamma and neutron detecting device that includes a scintillation detector that detects gamma and thermal neutron radiation, the scintillation detector including signal detection and amplification electronics;

b. determining a thermal neutron peak position in the neutron pulse height

spectrum originating from cosmic ray background radiation;

c. monitoring the thermal neutron peak position in the neutron pulse height

spectrum during operation of the spectroscopic gamma and neutron detecting device; and

d. adjusting the signal detection and amplification electronics based on the thermal neutron peak position in the neutron pulse height spectrum, thereby stabilizing the spectroscopic gamma and neutron detecting device.

12. The computer program product of Claim 11, wherein the scintillation detector

comprises a scintillation crystal including at least 2 atomic% Li-6.

13. The computer program product of Claim 12, wherein the scintillation crystal is a Cerium (Ce)-doped Elpasolite having a chemical formula A2LiLnX6.Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium (Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

14. The computer program product of Claim 13, wherein the scintillation crystal is any one of Cs2LiYCl6:Ce (CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or Cs2LiYBr6:Ce (CLYB).

15. The computer program product of Claim 11, wherein determining the thermal neutron peak position in the neutron pulse height spectrum includes pulse shape

discrimination (PSD) that distinguishes between gamma and neutron radiation.

16. A method of distinguishing between gamma and neutron counts recorded by a

spectroscopic gamma and neutron detecting device, the method comprising:

a. providing a spectroscopic gamma and neutron detecting device that includes a scintillation detector that detects gamma and neutron radiation, the detecting device including pulse shape discrimination (PSD) electronics that distinguish between gamma and neutron counts;

b. measuring a pulse height spectrum of gamma radiation counts originating from cosmic ray background radiation using the detecting device; c. measuring a pulse height spectrum of neutron radiation counts originating from cosmic ray background using the detecting device; and

d. adjusting a PSD parameter based on a ratio between neutron radiation counts with energy greater than a threshold neutron energy and a sum of gamma radiation counts with energy greater than a threshold gamma energy and neutron radiation counts with energy greater than the threshold neutron energy.

17. The method of Claim 16, wherein the threshold neutron energy is 4 MeV and the threshold gamma energy is 3 MeV.

18. The method of Claim 16, wherein the scintillation detector comprises a scintillation crystal including at least 2 atomic% Li-6.

19. The method of Claim 18, wherein the scintillation crystal is a Cerium (Ce)-doped Elpasolite having a chemical formula A2LiLnX6.Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium (Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

20. The method of Claim 19, wherein the scintillation crystal is one of Cs2LiYCl6.'Ce (CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or Cs2LiYBr6:Ce (CLYB).

21. A spectroscopic gamma and neutron detecting device comprising:

a. a scintillation detector that detects gamma and neutron radiation;

b. pulse shape discrimination (PSD) electronics that distinguish between gamma and neutron counts detected by the scintillation detector; and

c. a PSD control module configured to:

i. measure a pulse height spectrum of gamma radiation counts

originating from cosmic ray background radiation using the detecting device;

ii. measure a pulse height spectrum of neutron radiation counts

originating from cosmic ray background radiation using the detecting device; and

iii. adjust a PSD parameter based on a ratio between neutron radiation counts with energy greater than a threshold neutron energy and a sum of gamma radiation counts with energy greater than a threshold gamma energy and neutron radiation counts with energy greater than the threshold neutron energy.

22. The device of Claim 21, wherein the threshold neutron energy is 4 MeV and the

threshold gamma energy is 3 MeV.

23. The device of Claim 21, wherein the scintillation detector comprises a scintillation crystal including at least 2 atomic% Li-6.

24. The device of Claim 23, wherein the scintillation crystal is a Cerium (Ce)-doped

Elpasolite having a chemical formula A2LiLnX6.'Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium

(Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

25. The device of Claim 24, wherein the scintillation crystal is one of Cs2LiYCl6.'Ce

(CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or Cs2LiYBr6:Ce (CLYB).

26. A computer program product carrying a computer program which, when loaded into a programmable processor, executes the method of:

a. measuring a pulse height spectrum of gamma radiation counts originating from cosmic ray background radiation using a spectroscopic gamma and neutron detecting device that includes a scintillation detector that detects gamma and neutron radiation, the detecting device including pulse shape discrimination (PSD) electronics that distinguish between gamma and neutron counts;

b. measuring a pulse height spectrum of neutron radiation counts originating from cosmic ray background using the detecting device; and

c. adjusting a PSD parameter based on a ratio between neutron radiation counts with energy greater than a threshold neutron energy and a sum of gamma radiation counts with energy greater than a threshold gamma energy and neutron radiation counts with energy greater than the threshold neutron energy.

27. The computer program product of Claim 26, wherein the threshold neutron energy is 4 MeV and the threshold gamma energy is 3 MeV.

28. The computer program product of Claim 26, wherein the scintillation detector

comprises a scintillation crystal including at least 2 atomic% Li-6.

29. The computer program product of Claim 28, wherein the scintillation crystal is a

Cerium (Ce)-doped Elpasolite having a chemical formula A2LiLnX6.'Ce, wherein A is any one of Sodium (Na), Potassium (K), Rubidium (Rb), or Cesium (Cs), Ln is any one of Scandium (Sc), Yttrium (Y), Lanthanum (La), or Lutetium (Lu), and X is any one of Bromine (Br) or iodine (I).

30. The computer program product of Claim 29, wherein the scintillation crystal is one of Cs2LiYCl6:Ce (CLYC), Cs2LiLaCl6:Ce (CLLC), Cs2LiLaBr6:Ce (CLLB), or

Cs2LiYBr6:Ce (CLYB).