methods with The 2017 International Radon Symposium Villert Julien Radon amp Health Physics Product manager julienvillertbertinfr Radon in Water amp Associated Health Risks ID: 652215
Download Presentation The PPT/PDF document "On-site determination of the radon con..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
On-site determination of the radon concentration in water: sampling and on-line methods with
The 2017 International Radon Symposium
™
Villert Julien
Radon & Health Physics Product manager
julien.villert@bertin.fr Slide2
Radon in Water & Associated Health Risks
EPA Map of Radon Zones by U.S. CountySlide3
Radon in Water & Associated Health Risks
Concentrations of radon in water can vary widely within a given rock formation, area, or county.Slide4
Radon in Water & Associated Health Risks
Radon is released into the air when water is used for showering and other household purposes. Slide5
Radon in Water & Associated Health
RisksSlide6
Limits
for Drinking waterValueUS EPA Maximum Contaminant Level (MCL)
11.1 Bq l-1 Or 300 pCi l
-1 BSF of European Union (MCL)
100 Bq l-1 Or 2700 pCi l-1
Radon
in Water & Associated Health
RisksSlide7
How to Measure Radon in WaterSlide8
Radon measurements of water samples by using AquaKIT are precise and correct. This is assured by the calibration of AlphaGUARD which can be traced back to different national standards and because the system disposes of an integrated quality assurance system
Sampling MethodMeasuring set-up with AlphaGUARD DF2000 Slide9
AquaKIT Components1
x degassing vessel1 x security vessel1 x spare degassing vessel4 x storage
vessels for sampling (2 x 100 ml/ 2 x 500 ml)4 x plastic injections for sampling (100 ml)
1 x mounting socket7 x connecting tubes1 x measuring cylinder1 x thermometer for laboratory use1 x active coal
filter cartridgeSampling methodSlide10
Sampling Method
Determine if radon is
generated from 226RaWater samples are stored
in glass containersThen re-measure the radon content after the required time for 226Ra to reach secular equilibrium with its progenySlide11
Sampling Method
Precision measurement by diminishing the radon level in the measuring set-up and with large vesselSlide12
Sampling MethodBoundary conditionsThe exactness and correctness of the AlphaGUARD
indicated values and thus also for the determined radon concentration of the water sample depends on the following boundary conditions: Relation of volume sample/measurement set-upTightness of the measurement set-upTemperature of sampleRadon level in the set-up before sampling
Background (intrinsic effect) of AlphaGUARDSlide13
Radon concentration formula in water samplesSampling Method
CWater = Radon concentration in water sample [pCi/l]CAir = Radon concentration [pCi/l] in the measuring set-up after expelling the radon (indicated by AlphaGUARD) c0 = Radon concentration in the measuring set-up before sampling (background) [pCi/l] Vsystem = Interior volume of the measurement set-up [ml]
VSample = Volume of the water sample [ml] k = Radon distribution coefficient water/air [ ] CWater =Slide14
Sampling MethodInterior volume of the set-upSlide15
Sampling MethodTemperature
dependency of the diffusion coefficient ‘k’ Slide16
Sampling method
The radium concentration in these samples is found to be between 0.03 and 0.43 Bq·L-1(or 0,8 and 11,6 pCi / l)
U. Akar, O. Gurler & others “Measurements of Radium Levels in bottled natural spring water of Marmara region (Turkey)” Physics Department, Faculty of Arts and Sciences, Uludag University (2009).Experimental
ResultsSlide17
Typ. operating range: 5 … 20 000 Bq/L or 135 … 540 000 pCi/l (direct
measurement) Time of execution: < 15 min / sample (sampling, degassing, measuring, analysing)Statistical error: ≤ 10 % at 5
Bq/L or 135 pCi/l (1-sigma error) Sampling Method
AquaKIT CharacteristicsLarger sampling volumes (up to 500 ml) and longer measuring times (≥ 45 min) decrease the statistical error band and enlarge the lower limit of the measuring range up to 0.1 Bq/L (or 2.7 pCi/l).Slide18
On-line Methods
Exchanger module of type RAM I keeps the air cycle completely separate from the water cycle by applying radon permeable membrane material from Accurel.Water pump is not required in cases the water supply is under pressure.Slide19
On-line MethodsSlide20
Radon in water used as a tracer: earthquake station
TheorySudden changes (either increase or decrease, also called radon anomalies) may be observed in the time series of radon concentration.
Source: evergreenfacts.comSlide21
ConclusionTest radon in water is a reliable way to control the in house contamination.It is highly recommended to test
for radon in your water if your home is served by well water.Slide22
Thank You for your attention !
The 2017 International Radon Symposium™
VILLERT Julien
Radon & Health Physics Product manager
julien.villert@bertin.fr