Time resolution measurements with an improved discriminator and conical scintillators

McGervey, John D.; Vogel, John S.; Sen, P.; Knox, C.

doi:10.1016/0029-554x(77)90231-2

Cited by 19 publications

(3 citation statements)

References 5 publications

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“…To discriminate photoelectric and Compton scattering events, the threshold for BaF 2 was À200 mV, and that for LYSO was adjusted between À150 and À330 mV, depending on the pulse height of each layer. The binary waveform data were transferred to a PC via a GPIB cable, and their time-stamps were analytically fixed using a digitalized constant fraction discrimination (CFD) method as described below [34][35][36][37]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Shibuya¹,

Nishikido²,

Tsuda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Methodsmentioning

confidence: 99%

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Shibuya¹,

Nishikido²,

Tsuda

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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“…2d). This shape was chosen, following the ideas of Butz et al [9] and assuming a sample holder/oven of diameter ∅ = 20 mm and relevant γ energies of 181 Hf (but also those of 111 In and 99 Mo TDPAC probes) would be used, in order to optimize the overall resolution of the spectrometer, i.e., to optimize: (a) its time resolution (conical and thin scintillators are demonstrated to be the better choice [10]) and (b) "the signal (experimental anisotropy) to relative accuracy (statistical error) ratio", defined as a figure of merit (FOM) of the measurement [9], i.e., of the R(t) spectrum:…”

Section: Description Of the Spectrometermentioning

confidence: 99%

Efficiency-optimized low-cost TDPAC spectrometer using a versatile routing/coincidence unit

et al. 2008

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A highly efficient, reliable, and low-cost γ -γ TDPAC spectrometer, PACAr, optimized for 181 Hf-implanted low-activity samples, is presented. A versatile EPROM-based routing/coincidence unit was developed and implemented to be use with the memory-card-based multichannel analyzer hosted in a personal computer. The excellent energy resolution and very good overall resolution and efficiency of PACAr are analyzed and compare with advanced and already tested fast-fast and slow-fast PAC spectrometers.

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“…The constant-fraction timing signal is the summation of the attenuated signal and the inverted and delayed signal, as described by equation (1). The time that the pulse crosses the zero axis is independent of amplitude and corresponds to the time at which the pulse reaches the fraction f of its final amplitude [31][32][33][34][35][36][37],…”

Section: Constant-fraction Timingmentioning

confidence: 99%

Sample-interpolation timing: an optimized technique for the digital measurement of time of flight for γ rays and neutrons at relatively low sampling rates

Aspinall

Joyce

Mackin

et al. 2008

Meas. Sci. Technol.

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A unique, digital time pick-off method, known as sample-interpolation timing (SIT) is described. This method demonstrates the possibility of improved timing resolution for the digital measurement of time of flight compared with digital replica-analogue time pick-off methods for signals sampled at relatively low rates. Three analogue timing methods have been replicated in the digital domain (leading-edge, crossover and constant-fraction timing) for pulse data sampled at 8 GSa s−1. Events arising from the 7Li(p, n)7Be reaction have been detected with an EJ-301 organic liquid scintillator and recorded with a fast digital sampling oscilloscope. Sample-interpolation timing was developed solely for the digital domain and thus performs more efficiently on digital signals compared with analogue time pick-off methods replicated digitally, especially for fast signals that are sampled at rates that current affordable and portable devices can achieve. Sample interpolation can be applied to any analogue timing method replicated digitally and thus also has the potential to exploit the generic capabilities of analogue techniques with the benefits of operating in the digital domain. A threshold in sampling rate with respect to the signal pulse width is observed beyond which further improvements in timing resolution are not attained. This advance is relevant to many applications in which time-of-flight measurement is essential.

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Time resolution measurements with an improved discriminator and conical scintillators

Cited by 19 publications

References 5 publications

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Timing resolution improvement using DOI information in a four-layer scintillation detector for TOF-PET

Efficiency-optimized low-cost TDPAC spectrometer using a versatile routing/coincidence unit

Sample-interpolation timing: an optimized technique for the digital measurement of time of flight for γ rays and neutrons at relatively low sampling rates

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