DURRIDGE NATURAL ROCK SAMPLE User Manual

Performance monitoring accessory for the rad7

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NATURAL ROCK SAMPLE

Performance Monitoring Accessory for the RAD7

User Manual

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Page 1   NATURAL ROCK SAMPLE Performance Monitoring Accessory for the RAD7 User Manual...
Page 2: Table Of Contents
TABLE OF CONTENTS 1 INTRODUCTION 2 RAD7 RADON SENSITIVITY CHECK 2.1 Purge the RAD7 2.2 Hook up to the Natural Rock Sample 2.3 Start a 3-Hour Test 2.3.1 Drying and Resealing the Natural Rock Sample 2.4 Radon Data Assessment 2.5 Multiple RAD7s 2.6 Cumulative Spectrum...
Page 3: Introduction
1 INTRODUCTION The Natural Rock Sample is a 21oz (600g) sample of granite gravel, enclosed in a container that may be sealed using a pair of ball valves and end caps. Granite generally contains trace amounts of both uranium and thorium that has been in the rock since it was formed, millions if not billions of years ago.
Page 4: Rad7 Radon Sensitivity Check
2 RAD7 RADON SENSITIVITY CHECK After sitting sealed on a shelf for one month, the radon in the Natural Rock Sample container will have reached within 1% of a steady value, in which the rate of emission of radon into the container is equal to the rate of loss by decay and leakage.
Page 5: Purge The Rad7
RH is below 9%, then switch oﬀ the RAD7. If a correction is to be made to the Natural Rock Sample radon reading for radon added to the air loop by the ambient air, after purging the RAD7, (see section 2.4), the fresh-air measurement should be kept going until at least one and preferably two or three cycles are completed.
Page 6: Radon Data Assessment
Natural Rock Sample tube. Mark the date on the label and store the Natural Rock Sample with its tubing and Small Drying Tube on a shelf for between 30 and 50 days before repeating the process.
Page 7 You may also, if you wish, calculate the total radon amount in the air loop, and hence originally in the Natural Rock Sample container. If the radon amount is Rn and the volume of the air loop is V, then the radon concentration is Rn/V.
Page 8: Multiple Rad7S
Natural Rock Sample container, when in equilibrium, is equal to 2 Bq. Let us also assume that the Natural Rock Sample and tubing has an air volume of 500ml while a RAD7 is 1L. Then when the RAD7 is connected up to the Natural Rock Sample and the radon distributed around the loop, the radon concentration will be 2 / 1.5 = 1.333 Bq/L = 1333 Bq/m...
Page 9: Cumulative Spectrum
8. If required, rough thoron checks may then be performed with each RAD7, separately connected to the Natural Rock Sample. Wait 1-2 hours before doing this, to allow time for the C window radon counts to decay away (see Section 3.1.1).
Page 10: Rad7 Thoron Sensitivity Check
Small Drying Tube full of desiccant, as the RAD7 is less sensitive in a humid environment. Just as with radon, the Natural Rock Sample's thoron output is a function of humidity at the rock-air interface, so it is important to ensure that your Natural Rock Sample is thoroughly dried out before making a measurement.
Page 11: Rough Thoron Check
During this time, the Natural Rock Sample can be left purging with a RAD7 (set Test > Purge) and a Laboratory Drying Unit, which will ensure that the Natural Rock Sample is thoroughly dry before the measurement begins.
Page 12 Figure 7 Thoron Sensitivity Check conﬁguration Sec$on 3 RAD7 Thoron Sensitivity Check...
Page 13: Experimental Protocol
Adjust the ﬂow rate through the Natural Rock Sample to 0.55 L/min. A ﬂow rate of 0.55 L/min is chosen as a standard ﬂow rate for injecting thoron into the RAD7 sample path because that may be relied upon to be less than the RAD7 pump ﬂow rate, which may range from 0.6 L/min to 1 L/min or...
Page 14 (+1) 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 are trademarks of DURRIDGE Company Inc., registered in the U.S. Revision 2021-02-15...