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61
ST 1.2 –
Dosimetría externa
DEVELOPMENT AND CHARACTERIZATION OF A DOSIMETRIC DEVICE
FOR EXTERNAL X AND GAMMA INDIVIDUAL MONITORING SYSTEM
Santoro, Christiana; Antonio Filh, João; De Oliveira, Fernanda Lúcia
UFPE. Brasil.
* Autor responsable, email:
chsantoro@gmail.com
There is a tendency in the individual monitoring of always being involved with refinements that
are able to effectively simulate the reality in terms of radiological conditions in which workers are
subjected when exposed to external sources of ionizing radiation. Calibration Laboratories
provide a set of irradiation conditions very well defined and standardized which can be used in
studies of the physical phenomena based on the recommendations: International Commission
on Radiation Units and Measurements - ICRU; International Commission on Radiological
Protection - ICRP and International Organization for Standardization - ISO. However, many
discoveries can still be expected to contribute to ideals and satisfactory radiological conditions.
Aiming to fill one of these gaps, a slab phantom, which is a human torso simulator, was used in
order to assess the true personnel dose equivalente, HP(d), for photographic dosimeters. The
slab was adapted and on it two dosimeters holders were built and placed inside the phantom at
a depth of 11 mm from the front surface. Later, dosimeters were calibrated for the personal
dose equivalent HP(10) at a depth d = 10 mm from the front surface. That is the position where
the eletronic equilibrium of the dosimetric system for radiation strongly penetrant occurs. Thus, it
was possible to evaluate the dose considering the influence of the backscattering and
absorption of ionizing radiation produced by the human body. The calibration curves for the
personal dose equivalent HP(10) were obtained from the data in the experiment when tested at
doses from 0.2 to 50 mSv a
60
Co and
137
Cs radioactive sources, and X-ray beam on the wide
(W) and narrow (N) spectra quality, as described by ISO 4037-1. The irradiation procedure with
the dosimetric device will enable, among other applications, to test and calibrations for the
purposes of scientific research and service to society.