but they do require a continuous gas supply. Guidance on application use In the United Kingdom the Health and Safety Executive (HSE) has issued a user guidance note on selecting the correct radiation measurement instrument for the application concerned. This covers all radiation instrument technologies and is a useful comparative guide to the use of proportional counters. See also Gaseous ionization detectors Micropattern gaseous detector Multiwire proportional chamber References Glenn F Knoll. Radiation Detection and Measurement, third edition 2000. John Wiley and sons, . E. Mathieson, Induced charge distributions in proportional detectors, https://web.archive.org/web/20081011022244/http://www.inst.bnl.gov/programs/gasnobledet/publications/Mathieson's_Book.pdf External links Patents , S. Fine, "Proportional counter" , E. W. Molloy, "Air proportional counter" Particle detectors Ionising radiation detectors Counting instruments Radiation protection de:Proportionalzähler hu:Proporcionális kamra