000			00958cab a2200265 4500
001			ABS46397
008			090401t xxu||||| |||| 00| 0 eng d
035			_a(Sirsi) u58053
041			_aeng
100			_aBrown, M.
245		4	_aThe invisible hazard
350			_a0
490			_aEarthwise British Geological Survey _v4-5(2)
520			_aMaps of areas of potential radon gas emission are being produced by the British Geological Survey, by combining the results of soil gas surveys with geological and geochemical information and using a geographical information system. The maps will guide surveyors to appropriate locations for the measurement of gas levels.
650			_aGIS
650			_aMAPPING
650			_aMeasurement _96256
650			_aPOLLUTION
650			_aRADON GAS
690			_aENVIRONMENTAL AND LAND CONSULTANCY
690			_aMAPPING AND MEASUREMENT
690			_aMINING AND MINERALS
942			_n0
948			_c04/03/1997
999			_c35415 _d35415