Mobility Gaps of Hydrogenated Amorphous Silicon Related to Hydrogen Concentration and Its Influence on Electrical Performance.

This paper presents a comprehensive study of hydrogenated amorphous silicon (a-Si)-based detectors, utilizing electrical characterization, Raman spectroscopy, photoemission, and inverse photoemission techniques. The unique properties of a-Si have sparked interest in its application for radiation detection in both physics and medicine. Although amorphous silicon (a-Si) is inherently a highly defective material, hydrogenation significantly reduces defect density, enabling its use in radiation detector devices.

Dosimetry of microbeam radiotherapy by flexible hydrogenated amorphous silicon detectors.

Detectors that can provide accurate dosimetry for microbeam radiation therapy (MRT) must possess intrinsic radiation hardness, a high dynamic range, and a micron-scale spatial resolution. In this work we characterize hydrogenated amorphous silicon detectors for MRT dosimetry, presenting a novel combination of flexible, ultra-thin and radiation-hard features.Two detectors are explored: an n-type/intrinsic/p-type planar diode (NIP) and an NIP with an additional charge selective layer (NIP + CSC).

Characterization of a flexible a-Si:H detector for in vivo dosimetry in therapeutic x-ray beams.

Background: The increasing use of complex and high dose-rate treatments in radiation therapy necessitates advanced detectors to provide accurate dosimetry. Rather than relying on pre-treatment quality assurance (QA) measurements alone, many countries are now mandating the use of in vivo dosimetry, whereby a dosimeter is placed on the surface of the patient during treatment. Ideally, in vivo detectors should be flexible to conform to a patient's irregular surfaces.

The decrease of maximal oxygen consumption during hypoxia in man: a mirror image of the oxygen equilibrium curve.

1. Endurance athletes (E) undergo a marked reduction of arterial O2 saturation (Sa,O2) at maximal exercise in normoxia, which disappears when they breathe hyperoxic mixtures. In addition, at a given level of hypoxia, the drop in maximal O2 consumption (VO2,max) is positively related to the individual normoxic VO2,max.

Kinetics of oxygen consumption during maximal exercise at different muscle temperatures.

The aim of this study was to test at maximal exercise the hypothesis of the temperature-dependence of the kinetics of O2 consumption (VO2), which predicts a greater O2 deficit as muscle temperature is decreased. Six male subjects underwent 3 min exercise bouts at the minimum power eliciting maximum O2 consumption (VO2max), at normal temperature (A) and after cooling the thigh muscles by water immersion (C). Breath-by-breath VO2 was measured together with muscle blood flow (Qm), blood lactate accumulation ("early lactate", eLa), heart rate and muscle temperature (Tm).