Now showing items 191-200 of 208
Range profiles and thermal release of 3He implanted into various nickel-based amorphous alloys
(Elsevier, 1990-12-20)
The behavior of 3He in the amorphous alloys Ni75.1Cr14P10.1C0.08, Ni63.5Zr36.5 and Ni87.7P12.3 is investigated. The samples were implanted with 150 keV 3He ions with doses of 1 x 1016 and 5 x 1016 3He/cm2. The samples ...
Ultrahigh-bandwidth vector network analyzer based on external electro-optic sampling
(Elsevier, 1992-03)
We report the development of an ultrahigh-bandwidth vector network analyzer useful for small-signal characterization of high-speed semiconductor devices. It employs 100-fs optical pulses for making terahertz-bandwidth ...
Transient Decay of Longitudinal Magnetization in Heterogeneous Spin Systems Under Selective Saturation. III. Solution by Projection Operators
(Elsevier, 1993-10-01)
A general method of solving equations governing the transient response of heterogeneous spin systems to continuous and pulsed RF saturation using the projection-operator technique is outlined. An effective rate equation ...
Improvements in the CR39 polymer for the macro experiment at the Gran Sasso Laboratory
(Elsevier, 1991)
We discuss the preparation of different samples of the CR39 polymer and a number of tests performed with high energy heavy ions. The quality and reproducibility of the manufactured CR39 is discussed as well as the implications ...
A luminosity monitor for the Mark II detector at the SLC
(Elsevier, 1992-07-15)
We describe the design and performance of the Mark II small angle monitor (SAM) used for measurements of Bhabha scattering at the SLC. We also present results of SLC luminosity measurements made with SAM for the first ...
Background-adaptive dual-energy-window correction for Compton scattering in SPECT
(Elsevier, 1994-12-30)
Detection of gamma rays which Compton scatter within a patient but are still within the photopeak window of the Anger camera leads to inaccuracies in quantification of radioactivity from nuclear-medicine images. With the ...
A positron accumulator
(Elsevier, 1990-12-20)
A design for a two-stage positron accumulator is presented. The first stage employs remoderation cooling of positrons while the second stage utilizes electron cooling. The device is designed to produce intense pulses of ...
Single-scatter Monte Carlo compared to condensed history results for low energy electrons
(Elsevier, 1992-10)
A Monte Carlo code has been developed to simulate individual electron interactions. The code has been instrumental in determining the range of validity for the widely used condensed history method. This task was accomplished ...
Effect of noise, order and range in fitting the photopeak region of local, Anger-camera energy spectra
(Elsevier, 1990-12-20)
In order to estimate and correct Compton scattering in nuclear-medicine Anger-camera imaging, we have previously required the least-mean-square error between the locally measured energy spectrum and one dependent on a ...