论文部分内容阅读
本文描述一台简易的180°聚焦β谱仪。谱仪的电子运动轨道平均半径是100mm,谱仪的均匀磁场是由单轭磁铁所产生的。D形真空室高70mm,利用磁极面作为底盖,用橡皮垫圈密封,谱仪的磁场测量采用“零点测磁仪”,测磁仪的心脏部分是一个偏心地安装在张紧的钨丝上的小的测量线圈,要使线圈在磁场中保持某一特定方向,就得使通过线圈的电流随着磁场的变化而作相应的改变,使得电磁作用所产生的力短和作用于线圈的机械力矩相平衡。因为重力矩固定不变,通过线圈电流的大小将和磁场强度成反比,测量所得电流读数可以作为磁场强度的度量,包括磁场测量在内谱仪测量总的线性和重复性都在0.1％左右。 经过调整和改进以后,谱仪目前的最好的分辨率是0.7％,那是利用源宽0.8mm的Hg~(198)K内转换谱线测得的。对于源宽2mm的Ba~(137)K内转换谱线我们测得的谱仪分辨率是 0.9％。 谱仪的主要优点在于它的简易。
This article describes a simple 180 ° focused β spectrometer. The average electron trajectory of the spectrometer is 100 mm, and the uniform magnetic field of the spectrometer is generated by a single yoke magnet. D-shaped vacuum chamber 70mm high, the use of magnetic pole surface as the bottom cover, sealed with a rubber gasket, the magnetic field spectrometer measurement using “zero magnetometer”, the magnetometer magnetometer part is mounted eccentrically on the Tungsten Of the small measuring coil, to make the coil in the magnetic field to maintain a particular direction, you have to make the current through the coil with the magnetic field changes and make the appropriate changes, making the electromagnetic force generated by the short and mechanical effects on the coil Moment balance. Because the moment of gravity is constant, the magnitude of the current through the coil is inversely proportional to the strength of the magnetic field. The resulting current reading can be used as a measure of magnetic field strength. The total linearity and repeatability of the spectrometer, including the magnetic field measurement, are all within 0.1%. After adjustment and improvement, the best resolution of the spectrometer at present is 0.7%, which is measured by the Hg ~ (198) K internal conversion spectrum with a source width of 0.8mm. For the Ba ~ (137) K internal conversion line with a source width of 2mm, the resolution of the spectrometer we measured was 0.9%. The main advantage of the spectrometer is its simplicity.