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Quaesta Instruments. Tucson Arizona Founded in 2008 Staff: 10 Electronic devices: radiation detection environmental monitoring data logging telemetry Off-the-shelf and custom products. Products. Neutron Pulse Monitors Proportional gas detectors

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Quaesta Instruments

  • Tucson Arizona

  • Founded in 2008

  • Staff: 10

  • Electronic devices:

    • radiation detection

    • environmental monitoring

    • data logging

    • telemetry

  • Off-the-shelf and custom products


Products

  • Neutron Pulse Monitors

    • Proportional gas detectors

  • Data logging devices

  • Environmental sensors

  • Mobile neutron detectors

  • Soil moisture monitoring stations

  • (radiation based)



Pulse Height Spectrum

Classical 3He spectrum digitized over 128 bins


Plateau Method

Counting Plateau

Lower

discriminator


Plateau Method

  • Requires many points for good resolution on discriminator set point

  • For low count rates, time per point may be large


Multichannel Analyzer

Lower

Discriminator

Upper

Discriminator


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)

Peak

Valley


Setting the Discriminator Levels

With a Multichannel Analyzer (MCA)

Peak

Valley









Value of a DetectorDigital NPM

  • Computer interface

  • MCA & spectra - optimization

  • Monitoring

  • Data logging


Data Logger Detector

  • Analog & digital I/Os

  • Relays

  • USB, RS-232, SDI-12

  • SD cards

  • Connect to NPMs

  • External Sensors

  • Telemetry






Roving Detector Data Detector

Noise produced by humidity




IAEA: MUNDs Detector

NPM

NPM: Ethernet + 15MHz input pulse counter


Soil Moisture Monitoring Detector

Field scale soil moisture monitoring using

cosmic ray neutrons

Measures fast and slow neutrons

Pressure & Humidity dependent

Average Soil Moisture

600 meters


Soil Moisture Monitoring Detector

  • Challenges

  • Low power consumption

  • Very low count rate

  • High stability in calibration

  • required wide temperature range

  • High resolution pressure meas



Soil Moisture Monitoring Detector

Alpine Location


New Stuff Detector




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