Objective
Multiwire proportional counter (MWPC) is used as a detecting element in a high sensitivity spectrometric alpha emitter detection system. 2 methods were applied to the design of electric fields in the counter. The first was based on conformal transformations and yielded approximate values of field and potential lines in a periodic structure of infinite length. The second, more accurate, method evaluated field and potential distributions by means of a finite elements program. The design of the detection chamber is that of a drift chamber. There are 3 separate counters sharing a large part of electrodes. 2 operate in parallel and the third is an auxiliary to control the working point of the principal counter. The electrode system is placed inside a brass box fitted with feed through insulators and connected to the gas pumping and filling system. There is a variety of counting gases which can be used in this type of chamber. Pressure measurements are made with a Bourdon type gauge and a small differential diaphragm manometer is used to indicate when the gas pressure is precisely atmospheric. The signals from the MWPC are processed by a preamplifier (either a hybrid RL-724or ORTEC model 113) followed by a biased spectroscopy amplifier Canberra model 1467 then signals are fed to the multichannel analyzer EGG model ADCAM 100T. The preamplifier has a very low noise level of about 300 eV.
Results show that the MWPC has a linear response to the introduced activity of a solid sample and that the energy resolution is sufficient to distinguish between most alpha emitters encountered in laboratories and in nuclear emergencies. With a workpoint stabilization it is possible to operate for 6 to 8 hours without a renewal of the gas filling.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Coordinator
00173 Roma
Italy
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