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NATURAL ROCK SAMPLE

Performance Monitoring Accessory for the RAD7

User Manual

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Summary of Contents for NATURAL ROCK SAMPLE

Page 1: ...NATURAL ROCK SAMPLE Performance Monitoring Accessory for the RAD7 User Manual...

Page 2: ...2 3 1 Drying and Resealing the Natural Rock Sample 5 2 4 Radon Data Assessment 6 2 5 Multiple RAD7s 8 2 6 Cumulative Spectrum 9 3 RAD7 THORON SENSITIVITY CHECK 10 3 1 Thoron Measurement 10 3 1 1 Radon...

Page 3: ...the closed loop radon calibration circuit or upstream of the desiccant in the open loop thoron calibration con guration If the desiccant in the Small Drying Tube gets used up it should be replaced or...

Page 4: ...be compared with the known concentration and thus the sensitivity of the RAD7 may be e ectively checked A correction may be applied to the Natural Rock Sample radon reading to account for the ambient...

Page 5: ...Setup Protocol Recycle 06 ENTER Put the RAD7 s infrared printer in place and switch o the RAD7 Switch on the RAD7 printer Switch on the RAD7 and let it print out the header including a review of the s...

Page 6: ...re one month from that date The next measurement should be made within 50 days of the date on the label to avoid the risk of moisture creeping in and changing the emanation e ciency and hence the rado...

Page 7: ...ock Sample system with standard RAD7 of 1 275 L If Rn is expressed in pCi then the radon concentration will be Rn 1 275 pCi L If Rn is expressed in Bq then the radon concentration will be Rn 1 275 Bq...

Page 8: ...al Rock Sample and the radon distributed around the loop the radon concentration will be 2 1 5 1 333 Bq L 1333 Bq m3 If every additional RAD7 adds 1L to the loop then four RAD7s would total 4 5L inclu...

Page 9: ...d with all pumps except one set to OFF 7 Depending on the precision required after between 3 and 24 hours the tests may be stopped and the RAD7s disconnected 8 If required rough thoron checks may then...

Page 10: ...measurement The setup assumed in the RAD7 data processing and stated as standard in the manual consists of a Small Drying Tube which may be used as a wand for sni ng along with a standard input tubing...

Page 11: ...Sample it will make no di erence to the average radon reading but will make a big di erence to the thoron readings Even just switching the connections to the Natural Rock Sample can a ect the thoron r...

Page 12: ...Figure 7 Thoron Sensitivity Check con guration Sec on 3 RAD7 Thoron Sensitivity Check 12...

Page 13: ...n check the rate of injection of thoron into the sample ow will always be the same Let this be Th The units of Th are pCi per minute or Bq per minute If the RAD7 ow rate measured at the RAD7 outlet is...

Page 14: ...978 667 9556 Fax 1 978 667 9557 Web www durridge com Email service durridge com Copyright 2020 DURRIDGE Company Inc All rights reserved DURRIDGE the DURRIDGE logo and the Works with the DURRIDGE logo...

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