A wearable sensor based on CLYC scintillators

Benjamin S. McDonald; Mitchell J. Myjak; Mital A. Zalavadia; John E. Smart; Jesse A. Willett; Peter C. Landgren; Christopher R. Greulich

doi:10.1016/j.nima.2016.03.034

A wearable sensor based on CLYC scintillators

Benjamin S. McDonald, Mitchell J. Myjak, Mital A. Zalavadia, John E. Smart, Jesse A. Willett, Peter C. Landgren, Christopher R. Greulich

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

We have developed a wearable radiation sensor using Cs₂LiYCl₆:Ce (CLYC) for simultaneous gamma-ray and neutron detection. The system includes two ∅2.5×2.5^cm3 crystals coupled to small, metal-body photomultiplier tubes. A custom, low-power electronics base digitizes the output signal at three time points and enables both pulse height and pulse shape discrimination of gamma rays and neutrons. The total counts, anomaly detection metrics, and identified isotopes are displayed on a small screen. Users may leave the device in unattended mode to collect long-dwell energy spectra. The system stores up to 18 h of one-second data, including energy spectra, and may transfer the data to a remote computer via a wired or wireless connection. The prototype is 18×13×7.5^cm3, weighs 1.3 kg, not including the protective pouch, and runs on six AA alkaline batteries for 29 h with the wireless link active, or 41 h with the wireless link disabled. In this paper, we summarize the system design and present characterization results from the detector modules. The energy resolution is about 6.5% full width at half maximum at 662 keV due to the small photomultiplier tube selected, and the linearity and pulse shape discrimination performance are very good.

Original language	English
Pages (from-to)	73-80
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	821
DOIs	https://doi.org/10.1016/j.nima.2016.03.034
State	Published - Jun 11 2016
Externally published	Yes

Funding

We thank Duane Balvage and Rick Lundy for their help in creating the circuit board designs for the LPS, and Daniel T. Keller for his help configuring and testing the Wi-Fi module. This work was supported by the Defense Threat Reduction Agency (DTRA) , competitively awarded under HDTRA1-12-NTD-BAA . This support does not constitute an expressed or implied endorsement on the part of the U.S. Government. Pacific Northwest National Laboratory (PNNL) is operated for the US Department of Energy by Battelle under Contract DE-AC05-76RL01830. PNNL document number: PNNL-SA-113450.

Funders	Funder number
US Department of Energy
Defense Threat Reduction Agency	HDTRA1-12-NTD-BAA
Battelle	DE-AC05-76RL01830

Keywords

Anomaly detection
CLYC
Gamma ray
Low power
Neutron
Radioisotope identification
Unattended sensor
Wearable

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10.1016/j.nima.2016.03.034

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title = "A wearable sensor based on CLYC scintillators",

abstract = "We have developed a wearable radiation sensor using Cs2LiYCl6:Ce (CLYC) for simultaneous gamma-ray and neutron detection. The system includes two ∅2.5×2.5cm3 crystals coupled to small, metal-body photomultiplier tubes. A custom, low-power electronics base digitizes the output signal at three time points and enables both pulse height and pulse shape discrimination of gamma rays and neutrons. The total counts, anomaly detection metrics, and identified isotopes are displayed on a small screen. Users may leave the device in unattended mode to collect long-dwell energy spectra. The system stores up to 18 h of one-second data, including energy spectra, and may transfer the data to a remote computer via a wired or wireless connection. The prototype is 18×13×7.5cm3, weighs 1.3 kg, not including the protective pouch, and runs on six AA alkaline batteries for 29 h with the wireless link active, or 41 h with the wireless link disabled. In this paper, we summarize the system design and present characterization results from the detector modules. The energy resolution is about 6.5% full width at half maximum at 662 keV due to the small photomultiplier tube selected, and the linearity and pulse shape discrimination performance are very good.",

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AU - Myjak, Mitchell J.

AU - Zalavadia, Mital A.

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A wearable sensor based on CLYC scintillators

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