Re: neutron probe aluminium tube

[Greg Dryden]

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Have you thought of using a post driver ramming onto a steel mast that is
inserted inside the aliminium tube and hit on a steel plug that is taped to
the bottom of your aliminium tube.  The mast has a collar at the top of the
aliminium tube that guides the aliminium tube down behind the steel plug
that is being driven into the soil.  This virtually eliminates air gaps.

Regards

Greg Dryden

----- Original Message -----
From: <owner-sowacs@aqua.ccwr.ac.za>
Sent: Friday, August 27, 1999 7:05 AM
Subject: neutron probe aluminium tube


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>
> Dear subscribers,
>
> I have a slight dilemma. I have recently installed a neutron probe
aluminium
> access tube and the hole drilled for installation is slightly larger than
> the tube (only about < 5mm diameter). Should I leave the small air gap as
it
> is or fill it with bentonite? Which will affect my readings more?
>
> Thanks
>
>
> ****************************************************************
>
> Magdeline Pokar, Tel: 0113-2335231 (O)
> School of Earth Sciences,      0113-2343795 (H)
> University of Leeds, Fax: 0113-2335259
> Woodhouse Lane, email: M.Pokar@earth.leeds.ac.uk
> Leeds, West Yorkshire,
> LS2 9JT. UK
>
>
>
>
>