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Summary of Contents for DURRIDGE RAD AQUA
- Page 1 RAD AQUA Continuous Radon in Water Accessory for the RAD7 User Manual ...
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Page 2: Table Of Contents
INTRODUCTION 1 RAD AQUA SETUP 1.1 Exchanger Assembly 1.1.1 Nozzles 1.1.2 Temperature Probe 1.1.3 Air return Fig. 1 RAD AQUA with Temperature Probe 1.1.4 Tie rod 1.2 Connections 1.2.1 Air loop Fig. 2 RAD7 AQUA Standard Setup 1.2.2 DRYSTIK 1.2.3 RAD7 and Exchanger Location 1.2.4 Water Supply... - Page 3 6.1.1 Minimizing T1 with increased water flow rate 6.1.2 Minimizing T1 with reduced air volume 6.1.3 Minimizing T2 with a higher sensitivity RAD7 6.1.4 Minimizing T2 with multiple RAD7s and one RAD AQUA 6.1.5 Minimizing T2 with multiple RAD7s and multiple RAD AQUAs 6.2 Pump position 6.2.1 Positioning Equipment...
- Page 4 7.2 RAD7 Care 7.3 Exchanger Care 7.4 Desiccant Regeneration 7.5 RAD AQUA Troubleshooting 7.5.1 Rising Water Level 7.5.2 Spray Chamber Fills With Water 7.5.3 Air Path Integrity 7.5.4 Poor Spray Formation 7.5.5 Water Overflowing From Base REFERENCES Table of Contents...
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Page 5: Introduction
INTRODUCTION The RAD AQUA is an accessory for the DURRIDGE RAD7 Electronic Radon Detector. It is a device to bring the radon concentration in a closed air loop into equilibrium with the radon concentration in a flow-through water supply. It consists of a spray chamber, called an “exchanger”, that brings the air and water into equilibrium. The radon in the air is monitored continuously by the RAD7. -
Page 6: Rad Aqua Setup
1.1.1 Nozzles The RAD AQUA is supplied with three pairs of alternative nozzles. These are the WL4, WL1 and WL0.25. We install one and include the other two in the accessories. -
Page 7: Connections
Two pieces of tubing connect the RAD7 and drying assembly to the laboratory drying unit, at the unit to the RAD AQUA air/water exchanger, as SCREW CAP end, with the tubing and sleeve shown in Fig. 2. These two pieces of tubing can be provided. -
Page 8: Water Supply
PUMP and MODE set to AUTO, With the water flowing, a spray will be observed may make good sense. inside the body of the exchanger. Water will Section 1 RAD AQUA Setup... -
Page 9: Protocol
SETUP SAVUSER [ENTER] : Push . When it says “Are you sure?” use arrow keys to change response to “Yes” 1.5.2 RAD AQUA Protocol [ENTER] and push MENU Switch on RAD7. Push the key. Go to: 1.5.3 User Protocol... -
Page 10: Measurement Procedure
Considering the volume of the RAD7, the drying unit water starts to flow out of the outlet hose. Switch on and the RAD AQUA, we can conservatively estimate the RAD7 (have the printer switched on if you are the volume of the air loop to be of the order 4 litres. -
Page 11: Rad7 Mode
RAD7’s response time will be a couple of hours or so. Every time the desiccant is changed, therefore, all the The RAD AQUA can be running with a low water stored data should be downloaded to a PC, backed flow rate and the RAD7 pump can be on AUTO also. -
Page 12: Data
The RAD7 gives an accurate reading of the radon calculate radon concentrations. This water concentration in the air. With the RAD AQUA, this temperature data is obtained by exporting it from the Section 3... -
Page 13: Calculation
The water radon concentration may where T is the temperature in deg C. be calculated using CAPTURE (see the RAD AQUA information in the CAPTURE user’s manual) or it At room temperature, a is around 0.25, giving, at... -
Page 14: Thoron In Water
4 THORON IN WATER flow rate of, say, 4 L/min will mean a time delay for 4.1 Why Thoron? the thoron to reach the exchanger of no more than Thoron, 220-Rn, an isotope of 222-Rn radon, has a 2.5 seconds. 55.6 second half life. -
Page 15: Speed Of Response
4.4 Speed of Response There is another advantage to using thoron as a tracer We have seen that with the highest sensitivity to locate submarine springs. That is the almost configuration, using a separate pump to circulate air instantaneous response of the RAD7 to thoron. round the loop, the total time for thoron to go from the sampling point to the RAD7 is only about 1.5 The first daughter of thoron, 216-Po, has a half life of... -
Page 16: Drystik
A 48” DRYSTIK will increase the life by about 10 times. 5.4 Custom designed Active DRYSTIK The 0.2 L/min flow rate of the DURRIDGE-supplied 5.2 Active DRYSTIK active DRYSTIK arises because it matches the average In active configuration, there is a pump upstream and... - Page 17 Fig. 3 RAD AQUA configuration with Active DRYSTIK and Water Switch Section 5 DRYSTIK...
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Page 18: Boating
6.1.2 Minimizing T1 with reduced air volume needs of oceanographers making surveys, by boat, of A typical RAD AQUA setup has a RAD7, a spray coastal zones and lakes. In this application there are chamber and a drying unit. The spray chamber and a number of considerations. -
Page 19: Minimizing T2 With Multiple Rad7S And One Rad Aqua
RAD AQUAs or two while the counting time will be reduced by If each RAD7 has its own RAD AQUA and bilge more than 33% which, in this case, will be around 14 pump, adding another complete system will not minutes. -
Page 20: Care, Maintenance, And Troubleshooting
Please keep the RAD7 in a relatively clean and dry environment. One way is to enclose 7.5 RAD AQUA Troubleshooting the instrument in a large, transparent plastic bag, see Section 1.2.3 above. Should it ever be seriously 7.5.1 Rising Water Level... -
Page 21: Spray Chamber Fills With Water
When drawing a sample from a remote location, air the water will need to be reduced. This will slow path integrity is essential to prevent dilution of the down the speed of response of the RAD AQUA and sample with ambient air. Always make sure that RAD7 system. ... -
Page 22: References
REFERENCES The following references are in chronological order. Weigel, F, 1978. Chemiker Zeitung, 102 (1978) 287 Burnett, W.C., G. Kim, and D. Lane-Smith, 2001. A continuous radon monitor for assessment of radon in coastal ocean waters. Journal of Radioanalytical and Nuclear Chemistry, 249, 167-172. Burnett, W.C., J. - Page 23 Weinstein, Y., Y. Shalem, W.C. Burnett, P.W. Swarzenski, and B. Herut, 2007. Temporal variability of Submarine Groundwater Discharge: assessments via radon and seep meters, the southern Carmel Coast, Israel. International Association of Hydrological Sciences (IAHS) Publ. 312, “A New Focus on Groundwater-Seawater Interactions,” (ed. W.
- Page 24 Telephone: (978)-667-9556 Fax: (978)-667-9557 Web: www.durridge.com Email: service@durridge.com © Copyright 2018 DURRIDGE Company Inc. All rights reserved. DURRIDGE, the DURRIDGE logo, and the Works with the DURRIDGE logo are trademarks of DURRIDGE Company Inc., registered in the U.S. Revision 2018-02-03...
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