آشکارسازی پرتوهای آلفا با استفاده از کارکرد آشکارسازهای گازی مقیاس ریز در مد SQS

نویسندگان

دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان

10.22052/5.2.29

چکیده

در آشکارسازهای گازی در حضور مخلوط‌های گازی جاذب فوتون­های UV می­‌توان بعد از مد تناسبی، وارد مد SQS گردید که با پدیدار شدن یک ستون نور مرئی، در محل ورود اشعه، همراه می­‌باشد. در این تحقیق با طراحی، شبیه‌سازی و ساخت سه آشکارساز گازی مقیاس ریز ضخیم، THGEM، با ابعاد هندسی مختلف، نشان داده شده است که چگونه می‌توان با استفاده از قابلیت کارکرد آن­ها در مد SQS اقدام به تشخیص موقعیت مکانی پرتوهای ورودی نمود. در این روش هر یک از حفره‌های صفحات THGEM، به­عنوان یک پیکسل تصویر، مستقل از دیگر حفره‌ها، می‌تواند وارد مد SQS شود که در این حالت یک ستون نور درون آن حفره پدیدار می‌گردد. از آن­جا که شدت روشنایی هر حفره در یک ولتاژ خاص متناسب با تعداد الکترون‌های اولیه وارد شده به آن حفره می‌باشد، نشان داده شده است که از این روش می‌توان، به سهولت، جهت تشخیص پرتوهای آلفا استفاده کرد.
 

کلیدواژه‌ها

عنوان مقاله [English]

Alpha radiation detection by using of Micro Pattern Gas Detectors in SQS mode

نویسندگان [English]

  • Razieh Souri
  • Ali Negarestani
  • Mohammad Mahani
چکیده [English]

In gas detectors with UV absorbing gas mixture, the Self-Quenched Streamer (SQS) mode can be achieved following the proportional mode, which leads to appear the light column. In this study, the design, simulation and construction of three micro pattern gas-detector, THGEM, with different geometric dimensions are presented. Moreover, the ability of operation in SQS mode to determine incident rays position without using any conventional imaging system is investigated. In the presence of UV absorbing gas mixtures, the proportional mode of the gas detector operation is followed by SQS mode as soon as the visible light column appears at the ray entrance location. In the employed method, each THGEM hole as an image pixel can operate in the SQS mode with emerging a light column, independent of other holes. As a consequence, it can be used for alpha beam detection since the brightness of each hole at a certain voltage is proportional to the number of primary electrons entered the hole.
 

کلیدواژه‌ها [English]

  • Micro Pattern Gas Detector
  • Thick Gas Electron Multiplier
  • Maxwell Software
  • Self-Quenched Streamer (SQS) Mode
  • Alpha Radiation

مراجع

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