Targets for producing high purity I-123

Tellurium powder in improved targets is bombarded with a cyclotron beam to produce Xe-123. Flowing gas streams carry the Xe-123 through one cold trap which removes Xe-123 that subsequently decays to I-123. During this bombardment energy is deposited in the target material causing its temperature to rise. Some of the tellurium vaporizes and subsequently condenses on surfaces that are cooler than the vaporization temperature. Provision is made for the repeated bombardment of this condensed tellurium

Self-vapor cooled targets for production of I-123 at high current accelerators

The basic elements of the vapor cooled target system are shown. This system can be operated as a heat pipe or as a conventional condenser. The choice of target fluid is based on the specific nuclear reaction chosen to produce Xe-123. The reaction using I-127 was studied and shown to have a significant yield for bombarding energies from 47 to 63 MeV. The Cs-133 reaction is also included. Xenon-123 is applied to I-123 production in a purer form for thyroid studies

The Pharisee Church: Why the Heart of the Modern American Church Does Not Match the Heart of Christ and What We Can Do To Change It

Religious discussions often hinge on semantics. Currently debate abounds concerning the state of the modern American Church. Is it failing? Is it flourishing? Who is a part of it? Comparing the biblical understanding of church to the state of the modern American Church provides great insight into how the modern church has erred. Investigating the semantic range of the word “church” also sheds light on why perceptions of the modern American Church vary. Additional comparisons are made between the typical American Christian and Pharisees. Potential similarities are identified and analyzed. Finally, suggestions are made regarding church reform so that the reputation of Jesus Christ may be regarded highly by those who are skeptical of the modern American Church

The Impacts of a Community-Based Health Education and Nutritional Support Program on Birth Outcomes Among Migrant Workers in Maesot, Thailand: A Retrospective Review

Here is presented a retrospective review of the Charis Project’s Family Engagement Program (FEN) as it existed in 2014-2017. FEN was a program of women’s health education, nutrition supplements, and family visitation. The education program consisted of a 12-week course on nutrition, maternity, and sex education taught individually and in groups, focusing on pregnant Burmese migrant laborers, but including approximately 20 percent male participation. The nutrition supplements consisted of 5 kilograms of fresh vegetables and 12 eggs weekly to pregnant mothers, from course onset to about six months after childbirth depending on family needs. Family visitation took place during food deliveries, and focused on individual counselling and family stability. The program served 39 families from 2014-2017. FEN did not reduce neonatal mortality (due to a miscarriage and severe congenital birth defect), but resulted in all surviving infants being born normal weight and surviving to the end of 2019, representing a significant improvement over the 25.6 percent low birth weights reported for Kayin State, Myanmar

A target for production of radioxenons

A liquid cesium target has been developed which allows the production and separate identification of the neutron deficient isotopes of xenon. The present report describes irradiations utilizing 34 to 41 MeV protons to produce millicurie quantities of Xe-127 and Xe-129m. At higher energies, however, the target could be used without modification to produce xenon isotopes as light as 119

Proton radiation damage in bulk n-GaAs

Bulk samples of Te-doped n-type GaAs were irradiated using 10 MeV to 24 MeV protons to fluences between 2 x 10 to the 11th power protons/sq cm and 2 x 10 to the 14th power protons/sq cm. Majority carrier electrical effects were measured using the vanderPauw techniques and it was observed that radiation damage was minimal at the 10 to the 11th power proton/sq cm fluence. For the higher fluences, carrier removal was proportional to Delta E/Delta x for the protons indicating ionization interactions between the protons and atoms. Thermal annealing was observed at 155 C

Decay of the Maxwell field on the Schwarzschild manifold

We study solutions of the decoupled Maxwell equations in the exterior region of a Schwarzschild black hole. In stationary regions, where the Schwarzschild coordinate $r$ ranges over $2M < r_1 < r < r_2$, we obtain a decay rate of $t^{-1}$ for all components of the Maxwell field. We use vector field methods and do not require a spherical harmonic decomposition. In outgoing regions, where the Regge-Wheeler tortoise coordinate is large, $r_*>\epsilon t$, we obtain decay for the null components with rates of $|\phi_+| \sim |\alpha| < C r^{-5/2}$, $|\phi_0| \sim |\rho| + |\sigma| < C r^{-2} |t-r_*|^{-1/2}$, and $|\phi_{-1}| \sim |\underline{\alpha}| < C r^{-1} |t-r_*|^{-1}$. Along the event horizon and in ingoing regions, where $r_*<0$, and when $t+r_*1$, all components (normalized with respect to an ingoing null basis) decay at a rate of C \uout^{-1} with \uout=t+r_* in the exterior region.Comment: 37 pages, 5 figure

The Ubiquitous Hūrī: Maritime Ethnography, Archaeology and History in the western Indian Ocean

This is the author accepted manuscript. The final version is available from Barkhuis Publishing via the ISBN in this recordISBSA 13: Thirteenth International Symposium on Boat and Ship Archaeology, 8-12 October 2012 Amsterdam, The Netherland

Stability and Instability of Extreme Reissner-Nordstr\"om Black Hole Spacetimes for Linear Scalar Perturbations I

We study the problem of stability and instability of extreme Reissner-Nordstrom spacetimes for linear scalar perturbations. Specifically, we consider solutions to the linear wave equation on a suitable globally hyperbolic subset of such a spacetime, arising from regular initial data prescribed on a Cauchy hypersurface crossing the future event horizon. We obtain boundedness, decay and non-decay results. Our estimates hold up to and including the horizon. The fundamental new aspect of this problem is the degeneracy of the redshift on the event horizon. Several new analytical features of degenerate horizons are also presented.Comment: 37 pages, 11 figures; published version of results contained in the first part of arXiv:1006.0283, various new results adde