1. Quaesta Instruments Tucson Arizona Founded in 2008 Staff: 10 Electronic devices: radiation detection environmental monitoring data logging telemetry Off-the-shelf and custom products

2. Neutron Pulse Monitors -Proportional gas detectors Data logging devices Environmental sensors Mobile neutron detectors Soil moisture monitoring stations (radiation based) Products

3. Neutron Pulse Monitor NPM

4. Pulse Height Spectrum Classical 3He spectrum digitized over 128 bins

5. Plateau Method Counting Plateau Lower discriminator

6. Plateau Method Requires many points for good resolution on discriminator set point For low count rates, time per point may be large

7. Lower Discriminator Upper Discriminator Multichannel Analyzer

8. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

9. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

10. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

11. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

12. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

13. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

14. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

15. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

16. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

17. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

18. Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

19. Setting the Discriminator Levels With a Multichannel Analyzer (MCA) Valley Peak

20. Setting the Discriminator Levels With a Multichannel Analyzer (MCA) Peak Valley

21. Real Spectra

24. He3 tube failure under thermal cycle testing

25. Example of Field Neutron Detector System Failure, BF3 Detector Time Series

26. Histograms before and after suspicious neutron counts Dirty Connector

27. NPM Architecture

28. Value of a Digital NPM Computer interface MCA & spectra - optimization Monitoring Data logging

29. Data Logger Analog & digital I/Os Relays USB, RS-232, SDI-12 SD cards Connect to NPMs External Sensors Telemetry

30. Remote Monitoring & Mobile Detectors

33. Roving Detector Data

34. Noise produced by humidity

35. Remote Monitoring & Mobile Detectors

36. IAEA: Mobile Unit for Neutron Detection (MUNDs)

37. IAEA: MUNDs NPM NPM: Ethernet + 15MHz input pulse counter

38. Soil Moisture Monitoring Average Soil Moisture 600 meters Field scale soil moisture monitoring using cosmic ray neutrons Measures fast and slow neutrons Pressure & Humidity dependent

39. Soil Moisture Monitoring Challenges Low power consumption Very low count rate High stability in calibration required wide temperature range High resolution pressure meas

40. Soil Moisture Monitoring

41. Alpine Location

42. New Stuff

43. Neutron Detector Arrays