title: A micro-gap, air-filled ionisation chamber as a detector for criticality accident dosimetry.
abstract: A micro-gap air-filled ionisation chamber was designed for criticality dosimetry. The special feature of the chamber is its very small gap between electrodes of only 0.3 mm. This prevents ion recombination at high dose rates and minimises the influence of gas on secondary particles spectrum. The electrodes are made of polypropylene because of higher content of hydrogen in this material, when compared with soft tissue. The difference between neutron and gamma sensitivity in such chamber becomes practically negligible. The chamber's envelope contains two specially connected capacitors, one for polarising the electrodes and the other for collecting the ionisation charge.
authors: National Centre for Nuclear Research, Sołtana 7, Otwock 05-400, Poland.
authors: Ł
authors: Ł
authors: Murawski
authors: National Centre for Nuclear Research, Sołtana 7, Otwock 05-400, Poland.
authors: M
authors: M
authors: Zielczyński
authors: Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, Św. A. Boboli 8, Warsaw 02-525, Poland golnik@mchtr.pw.edu.pl.
authors: N
authors: N
authors: Golnik
authors: National Centre for Nuclear Research, Sołtana 7, Otwock 05-400, Poland.
authors: M A
authors: MA
authors: Gryziński
mesh_terms: D000390:Air Ionization; D004566:Electrodes; D004867:Equipment Design; D005720:Gamma Rays; D006801:Humans; D006859:Hydrogen / Q000737:chemistry; D007477:Ions; D008422:Materials Testing; D009502:Neutrons; D016273:Occupational Exposure / Q000032:analysis*; D011126:Polypropylenes / Q000737:chemistry*; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D018788:Radioactive Hazard Release
chemical_list: D007477:Ions; D011126:Polypropylenes; D006859:Hydrogen