Date: Tue, 30 Mar 1999 14:58:57 -0500

Author: Mary Ann Hickman

Subject: looking for indium and silver


Hey, y'all.

Has anyone out there purchased indium samples? Specifically, I am looking
for disks about 2 inches in diameter and about 0.005" thick. I'd also like
to find similar disks of silver.

We have a "neutron howitzer"-- an encapsulated plutonium-beryllium neutron
source--from about 1957 (DOE surplus). Some of you may recall seeing one of
these at the Nebraska AAPT meeting. We still use our monster for neutron
activation of silver and indium samples. Bombarding the samples with
neutrons produces isotopes with short half-lives which can be measured
during a lab period. Over the years, our supply of indium has gone from
about nine disks to about 3. I'm not even sure where the silver has gotten
to. It has probably been ten years or more since the last purchase.

Any leads are most appreciated!

Mary Ann

Mary Ann Hickman
Lecturer/Laboratory Coordinator
Dept. of Physics and Astronomy
Swarthmore College
500 College Ave.
Swarthmore, PA 19081