Page 57 - 00. Complete Version - Progress Report IPEN 2014-2016

Application of Ionizing Radiations | Progress Report 57

bon (methane, isobutane, butane)
with carbon dioxide and nitrogen
in distinct percentages. Since no
experimental data on the first
Townsend ionization coefficient
in all mixtures investigated are
available in the literature, our re-
sults were compared with Mag-
boltz simulation with very good
accordance within the experi-
mental error.
Figure 16. Industrial Instant Non-Scan-
ning Tomography system. Industrial Tomography Systems

Development of an Industrial Instant Non-Scanning
Tomography System

A portable tomography known as instant-non-scanning
type, a similar version of the fourth generation CT, was
developed at IPEN, supported by FAPESP. The difference
of this device compared to the fourth generation CT type
is that this scanner has five fixed gamma source, rather
Figure 17. Reconstructed images without water than a single source in a circular motion, moving contin-
flow (a); column scheme (b); reconstructed im-
ages with water flow of 2 liters/min and recon- uously around the detector ring. The proposed device is
structed images with water flow of 6 liters/min. configured with a ring of seventy NaI(Tl) detectors distrib-
uted circularly around the object
and five tungsten-shielding-case,
distanced among them with 14
NaI(Tl) detectors. All five shield-
ing cases contain, inside them,
approximately the same level of
radioactivity source. In summary,
the seventy detectors were sub-
divided in five subsets, contain-
ing fourteen detectors positioned
diametrically opposite to each ra-
dioactive source, in a fan beam
configuration, inside an angle of
36 degrees. This scanner was de-
signed to make it easily install-
able in complex refining towers,
pipes and in general, adaptable
to other components of indus-
trial production. The seventy de-