Understanding Neutron Radiography Reading VII-NRHB Part 2 of 2

4.3 THE COLLECTION OF THE ATLAS
4.3.1 Contents of the Collection in Ref 1.
The collection of the Atlas contains neutron radiographs of defects marked
with "o" on Fig. 4.2 (see also chapter 4.2.5).
The original neutron radiographs were taken at the DR1 RISØ reactor (2 kW)
on double coated Agfa Gevaert Structurix D4 X-ray film. A transfer technique
was used with a 0.1 mm dysprosium foil. Exposure time was about 30 min. to
a 1.6 x 10 6 n.cm 2 s -1 neutron beam (10 x 10 cm 2 ).
The L/D ratio in the vertical direction of the neutron beam (perpendicular to
the fuel pin axis) was 110 and in the horizontal direction (coinciding with the
pin axis) was 27,5.
The radiographs in the Atlas are reproductions of the original neutron
radiographs copied on Kodak X-Omat Duplicating Film. The original neutron
radiographs were also photographed on a 35 mm Agfapan 100 film and
thereafter enlarged (2x) on photographic paper. A selection of these
enlargements is also included in the present publication.
Charlie Chong/ Fion Zhang