NUKLEONIKA 2004, 49(1):29-31
B. Machaj, J. Bartak
Department of Radioisotope Instruments and Methods, Institute of Nuclear Chemistry and Technology,
16 Dorodna Str., 03-195 Warsaw, Poland
Fast method of measurement of radon concentration in water based on flushing (bubbling) water sample with
air in closed loop with Lucas cell is presented. The main feature of the method is washing radon from
large sample of water to small volume of air including the volume of Lucas cell, thanks to which high radon
concentration in the air and considerable sensitivity of measurement is achieved. Estimated measuring
sensitivity is S = 8.5 cpm/(Bq/dm3). Random error due to statistical fluctuations
of count rate at radon concentration 1, 100, 10 000 Bq/dm3 is: 11, 1.1, 0.1% correspondingly
at counting (measuring) time 10 min. Minimum detectable radon concentration in water for such counting
time is 0.11 Bq/dm3.