Position sensitive radiation detector

An apparatus and method are disclosed for detecting and locating the origin of a gamma ray in a medical diagnostic imaging system. At least one primary fiber, which is a scintillating optical fiber, is positioned to receive radiation from a gamma ray source. At least one secondary fiber intersects the primary fiber at a non-zero angle. Both fibers have a core surrounded by a cladding, with the claddings of the two fibers in optical contact at an intersection point. Both the primary and secondary fibers are provided with means for detecting light propagated in the fibers. The interaction of radiation such as a gamma ray with the primary fiber will result in the propagation of light in both the primary and secondary fibers, thereby permitting the determination of the site of impact of the gamma ray in the detector, and possibly also enabling the determination of the path of incidence of the gamma ray.Board of Regents, University of Texas Syste

A Laboratory Assessment of Tradable Fishing Allowances

Transferable allowance management systems are receiving increased attention from fishery managers and stakeholders alike. We use a laboratory experiment in which human subjects play the role of fishers to evaluate the promised economic efficiency of tradable allowance systems. In an experiment designed to parallel the most common rules for trading allowances, we find that allowance prices are only weakly associated with the value of the fishing right it provides. Instead, we find a high degree of price variability, consistent with field experiences. In the lab, this variability hampers convergence and supports speculation, leading to average prices much higher than the equilibrium value of allowances. During this protracted price discovery, allowances are misallocated and efficiency falls. Modifications to the market institutions used in most tradable allowance systems to improve price discovery and enhance efficiency are discussed.fishery management, ITQs, tradable fishing rights, transferable allowances, experiments, asset markets, Resource /Energy Economics and Policy, Q22, Q28, G12,

Towards an assemblage approach to literary geography

Over recent years literary geography has adopted a relational approach to its subject matter. This article continues this move, suggesting that assemblage theory can help develop the sub-discipline in two interrelated ways. Firstly, at a project level, assemblage theory enables literary geographers to identify all components that have agency and influence over the power of fiction (including authors, translators, publishers, readers, places, etc). As part of this first argument, the article develops Hones’ concept of reading fiction as a ‘spatial event’ (Hones, 2008, 2014). This article interacts with Hones’ textual ‘happening’ and seeks to emphasise the valence of the spatial event of fiction on reader relations to material and social geographies. It offers a short case study from the work of novelist Tessa Hadley to illustrate aspects of this valence. Secondly, at the sub disciplinary level, the article argues that assemblage theory may offer a common ground which allows scholars from both literary and geographical positions to locate their writings in the broader set of approaches that define literary geographies