Prof. Tomohiko Narita Profile

Prof. Tomohiko Narita

at College of the Holy Cross

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Author

Publications (18)

Proceedings Article | 30 August 2006 Paper

Characterization of single-sided charge-sharing CZT strip detectors for gamma-ray astronomy

Burçin Dönmez, John Macri, James Ryan, Jason Legere, Mark McConnell, Mark Widholm, Tomohiko Narita, Louis-André Hamel

Proceedings Volume 6319, 63190A (2006) https://doi.org/10.1117/12.683695

KEYWORDS: Sensors, Photons, Imaging spectroscopy, Monte Carlo methods, Spectroscopy, Compton scattering, Stereoscopy, Gamma radiation, Signal attenuation, Gamma-ray astronomy

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Proceedings Article | 17 September 2005 Paper

Further studies of single-sided charge-sharing CZT strip detectors

Burcin Donmez, John Macri, Mark McConnell, James Ryan, Mark Widholm, Tomohiko Narita, Louis-Andre Hamel

Proceedings Volume 5922, 59220H (2005) https://doi.org/10.1117/12.617297

KEYWORDS: Sensors, Prototyping, Diffusion, Clouds, Ionization, Ceramics, Imaging spectroscopy, Spectroscopes, Photons, Monte Carlo methods

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Proceedings Article | 18 August 2005 Paper

Hard x-ray polarimetry with EXIST

T. Narita, J. Hong, J. Grindlay

Proceedings Volume 5898, 58980B (2005) https://doi.org/10.1117/12.617509

KEYWORDS: Polarization, Sensors, Photons, Hard x-rays, Polarimetry, Particles, Modulation, X-rays, Compton scattering, Gamma radiation

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Proceedings Article | 18 August 2005 Paper

Developing a Compton polarimeter to measure polarization of hard x-rays in the 50-300 keV energy range

Jason Legere, Peter Bloser, John Macri, Mark McConnell, Tomohiko Narita, James Ryan

Proceedings Volume 5898, 58981G (2005) https://doi.org/10.1117/12.615565

KEYWORDS: Polarization, Sensors, Polarimetry, Scintillators, Modulation, Gamma radiation, Scattering, Photon polarization, Compton scattering, Solar processes

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Proceedings Article | 21 October 2004 Paper

Multipixel characterization of imaging CZT detectors for hard x-ray imaging and spectroscopy

Santosh Vadawale, Jae Sub Hong, Jonathan Grindlay, Peter Williams, Minhua Zhang, Eric Bellm, Tomohiko Narita, William Craig, Bradford Parker, Carl Stahle, Feng Yan

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.559748

KEYWORDS: Crystals, Crystallography, Sensors, Imaging spectroscopy, Platinum, Image resolution, Indium, Hard x-rays, Gold, Resistance

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Proceedings Article | 21 October 2004 Paper

Laboratory coded-aperture imaging experiments: radial hole coded masks and depth-sensitive CZT detectors

Jae Sub Hong, Santosh Vadawale, Minhua Zhang, Eric Bellm, Andrew Yousef, John Noss, Jonathan Grindlay, Tomohiko Narita

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.559650

KEYWORDS: Sensors, Crystals, Imaging systems, X-rays, Telescopes, Monte Carlo methods, Hard x-rays, X-ray telescopes, Signal to noise ratio, Electronics

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Proceedings Article | 29 September 2004 Paper

Single-sided CZT strip detectors

John Macri, Burcin Donmez, Mark Widholm, Louis-Andre Hamel, Manuel Julien, Tomohiko Narita, James Ryan, Mark McConnell

Proceedings Volume 5501, (2004) https://doi.org/10.1117/12.551958

KEYWORDS: Sensors, Prototyping, Signal detection, Electronics, Electrodes, Imaging spectroscopy, Ceramics, Photons, Monte Carlo methods, Spectroscopes

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Proceedings Article | 3 February 2004 Paper

Anode readout for pixellated CZT detectors

Tomohiko Narita, Jonathan Grindlay, Jaesub Hong, Francis Niestemski

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.506552

KEYWORDS: Sensors, Image resolution, Spatial resolution, Electrodes, Electrons, Astronomy, X-ray telescopes, Signal detection, X-rays, Signal to noise ratio

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Proceedings Article | 3 February 2004 Paper

Cathode depth sensing in CZT detectors

JaeSub Hong, Eric Bellm, Jonathan Grindlay, Tomohiko Narita

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.506216

KEYWORDS: Sensors, Crystals, X-rays, X-ray detectors, Signal detection, Electronics, Sensing systems, Calibration, Hard x-rays, Imaging spectroscopy

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Proceedings Article | 11 March 2003 Paper

Background measurements from balloon-borne imaging CZT detectors

Jonathan Jenkins, Tomohiko Narita, Jonathan Grindlay, Peter Bloser, Carl Stahle, Bradford Parker, Scott Barthelmy

Proceedings Volume 4851, (2003) https://doi.org/10.1117/12.461537

KEYWORDS: Sensors, Calibration, Crystals, Platinum, Gold, Electronics, Image sensors, Hard x-rays, X-ray telescopes, Collimators

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Proceedings Article | 25 January 2002 Paper

Design and preliminary tests of a prototype CZT imaging array

Tomohiko Narita, Jonathan Grindlay, Jonathan Jenkins, Marshall Perrin, D. Marrone, Ruth Murray, B. Connell

Proceedings Volume 4497, (2002) https://doi.org/10.1117/12.454234

KEYWORDS: Sensors, Gold, Crystals, Image sensors, Indium, Detector arrays, Prototyping, Imaging systems, Astronomy, Calibration

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Proceedings Article | 25 January 2002 Paper

Balloon flight background measurement with actively-shielded planar and imaging CZT detectors

Peter Bloser, Tomohiko Narita, Jonathan Jenkins, Marshall Perrin, Ruth Murray, Jonathan Grindlay

Proceedings Volume 4497, (2002) https://doi.org/10.1117/12.454226

KEYWORDS: Sensors, Americium, Collimators, Calibration, Crystals, Gamma radiation, Monte Carlo methods, Image resolution, Energy efficiency, Astronomy

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We present results from the flight of two prototype CZT detectors on a scientific balloon payload in September 2000. The first detector, referred to as CZT1, consisted of a 10 mm x 10 mm x 2 mm CZT crystal with a single gold planar electrode readout. This detector was shielded by a combination of a passive collimator in the front, giving a 40 degree field of view and surrounded by plastic scintillator, and a thick BGO crystal in the rear. The second detector, CZT2, comprised two 10 mm x 10 mm x 5 mm CZT crystals, one made of eV Products high pressure Bridgman material and the other of IMARAD horizontal Bridgman material, each fashioned with a 4 x 4 array of gold pixels on a 2.5 mm pitch. The pixellated detectors were flip-chip-mounted side by side and read out by a 32-channel ASIC. This detector was also shielded by a passive/plastic collimator in the front, but used only additional passive/plastic shielding in the rear. Both experiments were flown from Ft. Sumner, NM on September 19, 2000 on a 24 hour balloon flight. Both instruments performed well. CZT1 recorded a non-vetoed background level at 100 keV of approximately 1 x 10^-3 cm^-2s^-1keV^-1. Raising the BGO threshold from 50 keV to approximately 1 MeV produced only an 18% increase in this level. CZT2 recorded a background at 100 keV of approximately 4 times 10^-3 cts cm^-2s^-1keV^-1 in the eV Products detector and approximately 6 x 10^-3 cts cm^-2s^-1keV^-1 in the IMARAD detector, a difference possibly due to our internal background subtracting procedure. Both CZT1 and CZT2 spectra were in basic agreement with Monte Carlo simulations, though both recorded systematically higher count rates at high energy than predicted. No lines were observed, indicating that neutron capture reactions, at least those producing decay lines at a few 100 keV, are not significant components of the CZT background. Comparison of the CZT1 and CZT2 spectra indicates that passive/plastic shielding may provide adequately low background levels for many applications.

Proceedings Article | 13 December 2000 Paper

Construction and testing of a pixellated CZT detector and shield for a hard x-ray astronomy balloon flight

Peter Bloser, Tomohiko Narita, Jonathan Jenkins, Jonathan Grindlay

Proceedings Volume 4140, (2000) https://doi.org/10.1117/12.409116

KEYWORDS: Sensors, Hard x-rays, Gold, Lead, X-ray astronomy, Astronomy, Scintillators, Gamma radiation, Erbium, Collimators

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Proceedings Article | 21 November 2000 Paper

Development of gold-contacted flip-chip detectors with IMARAD CZT

Tomohiko Narita, Peter Bloser, Jonathan Grindlay, Jonathan Jenkins

Proceedings Volume 4141, (2000) https://doi.org/10.1117/12.407569

KEYWORDS: Sensors, Gold, Crystals, Electrons, Hard x-rays, X-rays, Electrodes, Indium, Spectral resolution, Temperature metrology

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Proceedings Article | 22 October 1999 Paper

Design and testing of a prototype pixellated CZT detector and shield for hard- x-ray astronomy

Peter Bloser, Jonathan Grindlay, Tomohiko Narita, Jonathan Jenkins

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366519

KEYWORDS: Sensors, Collimators, Tin, X-ray astronomy, Crystals, Hard x-rays, Gamma radiation, Astronomy, Scintillators, Monte Carlo methods

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Proceedings Article | 19 October 1999 Paper

Development of IMARAD CZT detectors with PIN contacts

Tomohiko Narita, Peter Bloser, Jonathan Grindlay, Jonathan Jenkins, H. Walter Yao

Proceedings Volume 3768, (1999) https://doi.org/10.1117/12.366627

KEYWORDS: Sensors, Crystals, Electric field sensors, Gold, Indium, Energy efficiency, Imaging systems, Hard x-rays, Image resolution, Cadmium sulfide

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Proceedings Article | 10 November 1998 Paper

CdZnTe background measurement at balloon altitudes with an active BGO shield

Peter Bloser, Jonathan Grindlay, Tomohiko Narita, Fiona Harrison

Proceedings Volume 3445, (1998) https://doi.org/10.1117/12.330275

KEYWORDS: Sensors, Gamma radiation, Hard x-rays, Electrons, Astronomy, Collimators, Space telescopes, Information operations, X-ray telescopes, X-rays

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Proceedings Article | 1 July 1998 Paper

Development of prototype pixellated PIN CdZnTe detectors

Tomohiko Narita, Peter Bloser, Jonathan Grindlay, Rengarajan Sudharsanan, Christopher Reiche, Claudia Stenstrom

Proceedings Volume 3446, (1998) https://doi.org/10.1117/12.312894

KEYWORDS: Sensors, Collimation, Prototyping, Hard x-rays, Image resolution, X-rays, Spatial resolution, Signal detection, Electronics, Image sensors

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Showing 5 of 18 publications

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