DURRIDGE RAD AQUA, User Manual

Page 1: ...RAD AQUA Continuous Radon in Water Accessory for the RAD7 User Manual...

Page 2: ...rature Probe 8 1 3 Water Flow 8 1 3 1 Water Source 8 1 3 2 Water Level 8 1 4 Air Flow 8 1 4 1 Continuous Pumping 8 1 4 2 Pump on Auto 8 1 4 3 Mode set to Auto 8 1 5 Protocol 9 1 5 1 RAD7 Protocol 9 1...

Page 3: ...Exchanger to RAD7 method 2 14 4 4 Speed of Response 15 5 DRYSTIK 16 5 1 Passive DRYSTIK 16 5 2 Active DRYSTIK 16 5 3 E ect on Response Time 16 5 4 Custom designed Active DRYSTIK 16 6 BOATING 18 6 1 Re...

Page 4: ...ant Regeneration 20 7 5 RAD AQUA Troubleshooting 20 7 5 1 Rising Water Level 20 7 5 2 Spray Chamber Fills With Water 21 7 5 3 Air Path Integrity 21 7 5 4 Poor Spray Formation 21 7 5 5 Water Overflowin...

Page 5: ...temperature the coe cient is about 0 25 That means there is four times higher concentration of radon in the air than in the water so there is in e ect a gain of four times in the sensitivity of the s...

Page 6: ...plications where speed of response is a major goal WL1 is a compromise between the two 1 1 2 Temperature Probe The probe is inserted through the stem adapter A little petroleum jelly may help it to sl...

Page 7: ...nt left at this end to the air inlet filter with 1 8 ID tubing at the filter end which is then placed on the RAD7 INLET The Luer taper ensures an airtight connection Fig 2 RAD7 AQUA Standard Setup 1 2...

Page 8: ...ill be observed inside the body of the exchanger Water will accumulate inside the base and overflow out through the hose connector s If the flow rate is very high it may be necessary to utilize both h...

Page 9: ...ntrations to gain better statistics choose AUTO SETUP THORON Choose OFF SETUP PUMP Choose ON or AUTO depending on choice see above SETUP TONE Choose what you like SETUP FORMAT Choose what you like but...

Page 10: ...100 counts would give a reading with a standard deviation of 10 At very low concentrations it may take hours and averaging over many cycles to reach a su ciently precise value 2 2 2 In uencing Factor...

Page 11: ...QUA can be running with a low water flow rate and the RAD7 pump can be on AUTO also For fast response however it is essential to force the RAD7 to stay in SNIFF mode Setup Mode Sniff ENTER It will the...

Page 12: ...radon concentrations This water temperature data is obtained by exporting it from the temperature logger software see Section 3 1 5 below For specific instructions on downloading and graphing RAD7 dat...

Page 13: ...emperature data is stored in the temperature logger It is necessary to download the RAD7 data to a PC preferably using DURRIDGE s CAPTURE software and to download the temperature logger data using the...

Page 14: ...say 4 L min will mean a time delay for the thoron to reach the exchanger of no more than 2 5 seconds 4 3 2 Exchanger to RAD7 method 1 The RAD7 pump will typically generate an air flow rate of around 0...

Page 15: ...ponse of the RAD7 to thoron is limited not be the half life of the polonium daughter but by the time it takes to get the sample into the measurement chamber We have seen that with the highest sensitiv...

Page 16: ...7 will keep the air sample in the RAD7 below 7 RH It will also last for a very long time and add only a tiny volume to the air loop maintaining a fast response See Fig 3 5 3 E ect on Response Time Wit...

Page 17: ...Fig 3 RAD AQUA con guration with Active DRYSTIK and Water Switch Section 5 DRYSTIK 17...

Page 18: ...eded increases significantly The Rule 3700 delivers 6 L min through a W4 nozzle but it takes over 15A One 8 hour run would completely discharge a 120 AH battery 6 1 2 Minimizing T1 with reduced air vo...

Page 19: ...reducing the advantage of the three pumps to only 5 to 10 minutes But with the Rule 3700 the extra 20L to 40L of water would take only 3 or 4 minutes to deliver thus preserving almost all the 20 minu...

Page 20: ...ir sockets and push the lid onto its hinges The wrap will make the RAD7 almost watertight If it tears it can be easily replaced at any time The instrument should in any case be returned every year for...

Page 21: ...or leaks 7 5 3 Air Path Integrity When drawing a sample from a remote location air path integrity is essential to prevent dilution of the sample with ambient air Always make sure that there are no lo...

Page 22: ...ter inputs into river dominated areas important The Chao Phraya River Gulf of Thailand Limnology and Oceanography 51 2232 2247 Povinec P P P K Aggarwal A Aureli W C Burnett E A Kontar K M Kulkarni W S...

Page 23: ...2008 Determination of transport rates in the Yellow River Bohai Sea mixing zone via natural geochemical tracers Continental Shelf Research 28 19 2700 2707 167 Povinec P P H Bokuniewicz W C Burnett J C...

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