Tracing Celtic Civilisation with Neutrons
Wagner, Physics Department, Technical University Munich R. Gebhard, Prähistorische
Staatssammlung, Museum for Prehistory, Munich
7500 years ago, men in Europe began to form earth with their hands into pots
and created ceramics by firing them. Only since the 5th century B.C. the
potteri´s wheel was introduced and making pottery became easier. Wheelturned
pottery could be produced quickly and in large amounts. Handicrafts were
established as independent professions in the big Celtic towns during the
3rd to the 1st century B.C. Objects for daily use were produced in abundance.
They were sold, and an extended system of trade and economy developed. Therefore
the civilization of this period was very uniform.
Certain forms of jewelry and ceramics were found all over Europe
(Fig. 1). This oppida civilization can be considered as a first European
Economical Union reaching from the south of Gallia to Bohemia in the East.
Its formation and its inner organisation are so far little understood by
archaeology. A study of its structures would be the key to an assessment
of the Celtic civilisation, which determined the history of middle and Western
Europe in the last two centuries B.C. (Fig. 2 and 3).
A characterization of the trade regions by a careful study of the
amount and regional spread of traded goods would help in such an attempt.
Of all finds ceramics is the most promising ware for such a study. It is
abundant everywhere and its provenance can be determined.
The archaeologist uses the help of science to determine the origin
of ceramics. The provenance of ceramics, or better of the clay it is made
of, can be exactly localized. Different clay deposits exhibit characteristic
trace element patterns, and pottery made from that clay carries its trace
element distribution as a fingerprint. The trace element contents are determined
by neutron activation analysis, the most accurate method of trace element
Small samples of sherds are ground in a mortar for analysis. The
powder is refired to remove moisture and carbonate and sealed into quartz
ampoules. During a short irradiation with neutrons in the core of a nuclear
reactor artificial radioactivity is produced. A standard with known composition
is irradiated together with the samples. Comparing the radioactive radiation
emitted by the samples with that in the standard, allows to determine compositions
of the samples. Data gained in such a way are sorted into groups by statistical
methods. As a result one finds groups of sherds made from identical raw materials.
Our study of Celtic ceramics started at the central oppidum of
Manching, north of Munich. This settlement covered an area of 380 hectares
and was one of the largest towns in Celtic times. Its region of economic
influence can be determined by comparing pottery which was made in Manching
with the material from rural and urban settlements in the close and more
First results show that the wide distribution of pottery of similar
appearance in Celtic Central Europe is due to the transfer of information
on form and decorations and on production techniques, while the actual migration
of ceramics was an unimportant exception. Pieces of painted and wheelturned
ware, undistinguishable by appearance, were produced in different local pottery
centers, Manching being just one of them. Technology transfer was already
of crucial importance in Celtic Europe.
Additional analyses will help to gain a more and more comprehensive
picture. It is already clear, however, that the application of modern techniques
is essential in the study of prehistory. In this example the use of neutrons
in a research reactor reveals interesting facts about the world from which
fine ceramics from the oppidum of Manching. Upper row: Pots and bottles of
painted ware. Below: wheelturned ware and combline decorated graphite ware.
of painted ware and graphite ware in Europe. The various centers of distribution
indicate different economic regions. The asterisk marks the location of the
oppidum of Manching in the center between the eastern (blue) and western
(red) regions of Celtic settlement.
View of the craftmenïs quarters in the oppidum of Manching. Scale of model 1:200.
Last update: 12.03.2004