Proposal for a New High Precision Particle Detector
THE precision commonly quoted when measuring the position of a charged particle track is ±0.3 mm for wire plane spark chambers1, ±0.4 mm for streamer chambers2 and ±0.7 mm for multiwire proportional chambers3,4. With the onset of the new generation of synchrotrons there is a need for detectors with better resolution. This arises from the fact that the accelerated particles will receive only small deflexions in analysing magnets. This article consists of a proposal for a detector that will provide the necessary increase in resolution.
Design and performance of wire spark chambers and magnetostrictive delay line readout system
Abstract We describe a wire spark chamber system having magnetostrictive delay line readout that was used in an experiment at the 184″ Berkeley Synchrocyclotron. The design and performance of the chambers, the electronics used to produce the direct digitization of the spark locations, and the analysis of the digital information are discussed. The spark chambers with 1 mm wire spacing had a spatial resolution of about 0.3 mm. In conjunction with an analyzing magnet forming a magnetic spectrometer, the spark chamber system achieved better than 1% momentum resolution for particles in the range of 200–320 MeV/ c . The data analysis was completed within several hours after acquisition, enabling the experimenters to take advantage of the information while the experiment was still in progress.
Evaluation of antioxidants by a rapid polarographic method
A simple, rapid, precise, and reproducible method and an adaptable apparatus for polarographic measurement of lipid peroxidation and antioxidant activity is described. This method measures antioxidant activity within a few min time as compared to the hours or days needed for several widely used methods. Peroxidation rates were measured for different lipids as a function of amount of lipid, and amount of biocatalyst. The method is applicable to the detection and measurement of the antioxidant effects exhibited by weak antioxidants and has been satisfactorily used for the measurement of the antioxidant activity of different concentrations of powerful antioxidants.