caa a22 4500 39750375X CHVBK 20180308164539.0 cr unu---uuuuu 161202e19950801xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082758 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082758 Properties of An Air-Flow Ionisation Chamber for the Measurement of Beta Contamination [Elektronische Daten] [A.J. Waker, C.D. Sauer] Traditional beta or alpha contamination monitors are designed so that these charged particles are detected directly. Successful monitoring can be difficult when the range of the particle to be detected is low and the surface to be monitored has a complex topology. This can be the case, for example, with contaminated tools and equipment. One means of overcoming these problems is to draw air from over the surface to be monitored into an ionisation chamber and to detect the ions formed in air by the radiation rather than the radiation particles themselves. So-called long range alpha detectors have been developed and used for soil and surface monitoring. This paper describes the design of an air-flow ionisation chamber used to investigate the properties of air ions formed by beta sources of various energies. The aim of this work was to study the formation of air ions, their transfer to the ionisation chamber by air flow and the loss of ions due to diffusion and recombination. From this data the overall detection efficiency of the air-flow chamber was calculated and an estimate of the lower detection limit made. The potential of this type of system for monitoring surfaces for tritium and other low energy beta emitters is discussed. Radiation Protection Dosimetry Waker A.J. aut Sauer C.D. aut Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 73-76 0144-8420 61:1-3<73 1995 61 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082758 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082758 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Waker A.J. aut NATIONALLICENCE 700 1- Sauer C.D. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 61/1-3(1995-08-01), 73-76 0144-8420 61:1-3<73 1995 61 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford