Quartz resonator based low-energy ionizing radiation detection
Bremsstrahlung+absorption of low energy Xrays) ... strong absorption in air due to low energy. ⢠calibration ... quartz as substrate (strong temperature coefficient).
Quartz resonator based low-energy ionizing radiation detection J.-M Friedt1,2 , C. Mavon1 , S. Ballandras2 , V. Blondeau-Patissier2 , M. Fromm1 (1) Laboratoire de Microanalyses Nucl´ eaires A. Chambaudet UMR CEA E4, Univ. de Franche-Comte, Besan¸con, FRANCE (2) Institut FEMTO-ST UMR CNRS 6174, D´ epartement LPMO, 32 avenue de l’Observatoire, Besan¸con, FRANCE
Objectives • Analyze the influence of soft X-rays & electrons on quartz acoustic resonators • Analyze the usability of quartz oscillators for quantitative ionizing radiation dose measurements
Cold-cathode X-ray generator • a high voltage generator (0-12 kV, 0-10 mA) accelerates electrons and creates a plasma (pressure=5.10−2 mbars)
• these electrons propagate either in vacuum (5.10−2 mbars) or air, but strong absorption in air due to low energy • calibration of the X-ray generated dose using an ionization chamber (requires the area above the target to be at room pressure)
E (kV) 1.0 2.0 5.0 10.0
250 number of hits
• peak energy defined by the energy of the incoming electrons (=voltage)
X ray penetration depth (1/e incoming) in glass (data: NIST)
300
• the accelerated electrons hit a grounded 11 µm Al electrode • Bremsstrahlung/ionization X-rays leak through the Al sheet (spectrum= Bremsstrahlung+absorption of low energy Xrays)
20 um thick Al target, air, Amptek XR100 detector close to the target, with RTD
energy spectrum in the 1 to 12 kV range, we monitor the frequency response in an oscillator ... The ionization radiation produced is either soft X rays in the 1-10 keV range in vacuum and ... Atmospheric pressure ... Xâray generator current (mA).
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