DURRIDGE RAD7 Manuale d'uso - Pagina 3

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1 INTRODUCTION

The Operational Check is essentially an uncalibrated sister product to the Natural Rock Sample. Whilst

the Natural Rock Sample provides reproducible, 'rock steady' radon and thoron activity concentrations

under conditions of secular equilibrium, the Operational Check is instead intended to be used to make

a quick check that your RAD7 is seeing and correctly identifying counts from radon and thoron. With

careful record-keeping, it can also be used to check for leaks in the RAD7's internal sample path.

The Operational Check 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.

Therefore all the progeny of both the uranium and thorium decay chains are fully supported and in full

equilibrium down to 226-Ra and 224-Ra.

Figure 1 Operational Check Components

Sec$on 1

Introduction