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RAD H

2

O

Radon in Water Accessory for the RAD7

 

 
 

User Manual

 

 

 
 
 
 

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Summary of Contents for RAD H2O

Page 1: ...RAD H2O Radon in Water Accessory for the RAD7 User Manual...

Page 2: ...mful chemicals to use Once the procedure becomes familiar and well understood it will produce accurate results with minimal e ort It is assumed that the user has a good working knowledge of the RAD7 I...

Page 3: ...or assembly 11 1 4 5 Finishing the Test 11 1 4 6 Interpreting the Results 11 Fig 5 RAD H2O printout 12 2 BACKGROUND 13 2 1 About Radon in Water 13 2 2 Health Risks Due to Waterborne Radon 13 2 3 Physi...

Page 4: ...omparison of RAD H2O with Other Methods 23 5 4 Quality Assurance 23 Fig 7 Method Comparison 24 6 CARE MAINTENANCE and TROUBLESHOOTING 25 6 1 Warning on Pump Direction 25 6 2 Warning on Tipping the Aer...

Page 5: ...DGE immediately at 978 667 9556 or email sales durridge com Continued on next page Section 1 Getting Started 5 RAD H2O Carrying Case Rugged Pelican brand case Dust proof and crushproof Sculpted foam i...

Page 6: ...RAD H2O Aerator Cap Kit Aerator Cap x2 Tubing for 40mL and 250mL vials Indoor Faucet Adaptor Plastic adaptor 20 inch vinyl tubing Drying and Charcoal Tube Kit Small drying tubes x 4 Tube of activated...

Page 7: ...the event that the tube connections to the instrument are reversed For more information on preventing water from entering the RAD7 see Section 6 2 Warning on Tipping the Aeration Unit Section 1 Getti...

Page 8: ...e tube of desiccant which is connected to the aerator cap and supported by a clamp on the retort stand The components are connected to one another using the included tubing as shown in Fig 3 on the fo...

Page 9: ...he laboratory drying unit to the RAD7 inlet with the inlet filter in place see RAD7 manual Purge the unit with fresh dry air for ten minutes After 10 minutes of purging with dry air push the Menu butt...

Page 10: ...ht of the 6th 250mL vial The end of the glass frit should be 150mm or 4 7 16 from the bottom of the aerator cap Adjust it as necessary Pick the tube appropriate to the size of vial containing the wate...

Page 11: ...ed for the small drying tube Continue the purge for another ten minutes Check the relative humidity as above and continue the purge until the relative humidity indication in the instrument drops to 6...

Page 12: ...Fig 5 RAD H2O printout Section 1 Getting Started 12...

Page 13: ...e public exposure to waterborne radon having discovered cases in which groundwater concentration exceeded 1 million pCi L Hess Federal action on the problem of radon in drinking water picked up in the...

Page 14: ...m Radon is continually being created in the ground so that groundwater often has high radon content By contrast open water contains very little dissolved radium That together with the proximity of the...

Page 15: ...shielded for high energy radiation and the residents are likely to spend significant periods of time in the radiation field Over time a long lived decay product lead 210 builds up in the column which...

Page 16: ...l will continue to contain the radon that was measured If this radon is still present when you start a new measurement it will erroneously influence the next measurement This is of special concern whe...

Page 17: ...ining radon from the system following the purge A small column containing 15 grams of activated carbon can remove up to 98 of the remaining radon from the RAD H2O system when connected in a closed loo...

Page 18: ...orb a small fraction of the radon that passes through the system A small fraction of a very large amount can still be a significant amount The radon may desorb from these materials over many hours In...

Page 19: ...exponential function with a time constant of 132 4 hours The mean life of a radon 222 atom is 132 4 hours which is the half life of 3 825 days multiplied by 24 hours per day divided by the natural lo...

Page 20: ...2 295 111 2 313 112 2 330 113 2 348 114 2 366 115 2 384 116 2 402 117 2 420 118 2 438 119 2 457 120 2 475 121 2 494 122 2 513 123 2 532 124 2 551 125 2 571 126 2 590 127 2 610 128 2 629 129 2 649 130...

Page 21: ...to detail you may be able to get the variation down to under 5 When taking a sample it is important that the water being sampled has never been in contact with air When sampling from a body of water i...

Page 22: ...5 2 8 Relative Humidity If the RAD7 is thoroughly dried out before use the relative humidity inside the instrument will stay below 10 for the entire 30 minutes of the measurement If not then the humi...

Page 23: ...ervatively estimated to reflect typical field usage The most demanding and patient RAD H2O operator should be able to reduce background to less than 0 02 cpm rather than the 0 10 cpm given in the tabl...

Page 24: ...ute count 51 20 2 5 19 20 120 minute count 36 14 1 8 14 14 2 sigma uncertainty at 100 pCi L in pCi L 20 minute count 53 20 24 20 60 minute count 31 12 1 5 14 12 120 minute count 22 8 5 1 1 10 8 5 DL C...

Page 25: ...sible water in or on the instrument it can be put in an oven at 50 C for a few hours to dry out completely Additionally desiccated air can be passed through the air path until the air leaving the RAD7...

Page 26: ...mplished using the included Bypass Assembly which allows some air pressure to bypass the aerator and flow directly from the RAD7 outlet to the drying tube The RAD H2O Bypass Assembly should be connect...

Page 27: ...at DURRIDGE Company The precise factor for any setup depends also on the choice and length of tubing For the most reliable assessment users should perform their own experiments with their own setup Co...

Page 28: ...or 250 protocol In fact the two could be made with the same sample First make a normal RAD H2O measurement then without changing the physical setup change the preset WAT protocol to SNIFF bypass the a...

Page 29: ...ironmental Studies 55 66 2012 Burnett W C R N Peterson I R Santos and R W Hicks Use of automated radon measurements for rapid assessment of groundwater flow into Florida streams Journal of Hydrology 3...

Page 30: ...Hess C T and S M Beasley Setting up a Laboratory for Radon in Water Measurements Chapter 13 in Cothern and Rebers 1990 Hunkeler D et al Can 222Rn be sued as a partitioning tracer to detect mineral oil...

Page 31: ...Products Inc Shallow Tray Low Profile Air Strippers and VOC and Radon Removal from Water pamphlets NEEP 17 Technology Drive West Lebanon NH 03734 1992 Prichard H M and T F Gesell Rapid Measurements of...

Page 32: ...ng Water Reducing Your Exposure to Radon 570 9 91 600 June 1991 U S EPA Office of Drinking Water Radionuclides in Drinking Water Factsheet 570 9 91 700 June 1991 Vitz E Toward a Standard Method for De...

Page 33: ...mpany 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 Note DURRIDGE frequently updates its product...

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