Claims
- 1. A method for online determination of characteristic values in groundwater measuring sites, comprising the steps ofpumping-out an output stream of groundwater at a groundwater measuring site, continuously determining from the output stream parameters identifying natural radon activity concentration and total activity concentration by measuring, electrical conductivity, temperature and pH, comparing the measured parameters relative to a volume measurement taken from the output stream, plotting the values of the parameters online as a function of the pumping-out volume, calculating from said parameters a plateau value of the activity concentration as well as an optimum time for taking a representative sample.
- 2. The method of claim 1, wherein the measuring of electrical conductivity, temperature and pH is done with a device which comprises an air-filled tube, comprising a membrane, which is permeable by diffusion.
- 3. The method of claim 2, wherein the tube is constructed in the form of a coil.
Priority Claims (2)
Number |
Date |
Country |
Kind |
196 21 158 |
May 1996 |
DE |
|
197 11 110 |
Mar 1997 |
DE |
|
Parent Case Info
This is a divisional application of application 09/180,706 filed Nov. 13, 1998 and issued into U.S. Pat. No. 6,252,598, which is a 371 application of PCT/EP97/02450 filed on May 14, 1997, claiming priority of German Applications 196 21158.1 filed on May 14, 1996 and 197 11 110.6 filed on Mar. 16, 1997.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4844839 |
Manchak, Jr. et al. |
Jul 1989 |
A |
5224389 |
Jensen et al. |
Jul 1993 |
A |
5744730 |
Ballard et al. |
Apr 1998 |
A |
6021664 |
Granato et al. |
Feb 2000 |
A |
Foreign Referenced Citations (5)
Number |
Date |
Country |
282 770 |
Sep 1990 |
DE |
39 11 366 |
Oct 1990 |
DE |
42 17 236 |
Dec 1993 |
DE |
297 04 842 |
May 1997 |
DE |
06 324200 |
Nov 1994 |
JP |
Non-Patent Literature Citations (3)
Entry |
Hoehn E., et al; “Radon in Groundwater: a Tool to Assess Infiltration from Surface Waters to Aquifiers” Water Resources Research, Aug. 1989; Bd. 25, No. 8, ISSN 0043-1397, see pp. 1795-1803. |
Willme U. et al.; Bestimmung von Grundwasserverweilzeiten mit Geogenem 222Radon Bei Kunstlicher Grundwasseranreicherung und Ulferfiltration in Einer Trinkwassergewinnungsanlage GWF Wasser Abwasser, Bd. 136, No. 5, May 1, 1995, see pp. 234-241. |
Labed V. et al; “Study of /sup 222/Rn Permeation Through Polymer Membranes: Application to Continuous Measurement of /sup 222/Rn in Water” Health Physics, Aug. 1992; Bd. 63, No. 2, ISSN 0017-9078, see pp. 172-178. |