Page 12 - PR 2014 2016 03 Applications of Ionizing Radiations

54 Application of Ionizing Radiations | Progress Report

with carbon dioxide and nitrogen in distinct with tungsten, instead of lead, in order to
percentages. Since no experimental data on make them as small as possible. They were
the first Townsend ionization coefficient in designed to contain up to two radioactive
all mixtures investigated are available in the sources with different energies and to have
literature, our results were compared with a system with stepper motor controlled by
Magboltz simulation with very good accor- computer, maintaining the operators at a
dance within the experimental error. distance from the radioactive sources. In this
CT, each of the seventy detectors is connected
Industrial Tomography to a set of multichannel type electronic acqui-
Systems sition board, developed at our Laboratory. The

developed tomography system is capable of
generating real-time images of the interior of
Development of an Industrial Instant Non- industrial process towers or tubes, with fast
Scanning Tomography System transients, without paralyzing the produc-
tion. This non-destructive analysis system
A portable tomography known as in - contributes to achieve high productive and
stant-non-scanning type, a similar version optimized yields in industrial processes, as
of the fourth generation CT, was developed well as contributing to the reduction of en-
at IPEN, supported by FAPESP. The difference vironmental impact, inherent to industry
of this device compared to the fourth genera- activity. The beneficiaries of the results of
tion CT type is that this scanner has five fixed this project are the oil refining industries and
gamma source, rather than a single source their derivatives and basic chemical industries.
in a circular motion, moving continuously
around the detector ring. The proposed device
is configured with a ring of seventy NaI(Tl)
detectors distributed circularly around the
object and five tungsten-shielding-case, dis-
tanced among them with 14 NaI(Tl) detectors.
All five shielding cases contain, inside them,
approximately the same level of radioactivity
source. In summary, the seventy detectors
were subdivided in five subsets, containing
fourteen detectors positioned diametrically
opposite to each radioactive source, in a fan Figure 16. Industrial Instant Non-Scanning Tomography system.
beam configuration, inside an angle of 36
degrees. This scanner was designed to make it
easily installable in complex refining towers,
pipes and in general, adaptable to other com- Gas-Liquid Distribution in the Random
ponents of industrial production. The seventy Packed Column using a third-generation
detectors, the five tungsten-shielding-cases gamma tomography
and collimators systems are mounted on two
MDF plates of 20 mm thick and, thus, they Random packed distillation columns are used,
are easily adaptable to different industrial extensively, in chemical and petrochemical
objects. The source shielding-cases were built industries to perform highly efficient process

Instituto de Pesquisas Energéticas e Nucleares