INTRODUCTION
Th
e RAD H
2
O is an accessory to the RAD7 that enables you to measure radon in water over a concentration
range of from less than 10 pCi/L to greater than 400,000 pCi/L. By diluting your sample, or by waiting for sample
decay, you can extend the method's upper range to any concentration.
Th
e equipment is portable and battery operated, and the measurement is fast. You can have an accurate reading
of radon in water within an hour of taking the sample.
Th
e RAD H
2
O gives results a
ft
er a 30 minutes analysis
with a sensitivity that matches or exceeds that of liquid scintillation methods.
Th
e method is simple and
straightforward.
Th
ere are no harmful chemicals to use. Once the procedure becomes familiar and well
understood it will produce accurate results with minimal e
ff
ort.
It is assumed that the user has a good, working knowledge of the RAD7. If both the RAD7 and the RAD H
2
O are
new to the user, then time should be spent learning how to make good measurements of radon in air with the
RAD7 before embarking on radon in water measurements. Instructions for RAD7 operation with the RAD H
2
O
are given in this manual but, for more detail about the instrument and its use, the reader is referred to the RAD7
manual.
Grateful acknowledgment is made of the signi
fi
cant contribution to this manual by Stephen Shefsky, who wrote
most of the original NITON RAD H
2
O manual, much of which is incorporated in this version. However, all
responsibility for the content now rests with DURRIDGE Company.
Introduction
2
