Page 215 - 00. Complete Version - Progress Report IPEN 2014-2016

Nuclear Science and Technology | Progress Report 215

Clinical dosimeters (radiotherapy level) can be
calibrated, using gamma (60Co) or low energy
X radiation. As a reference system, a secondary
standard ionization chamber is used, traceable
to the Physikalisch-Technische Bundesanstalt,
PTB, Germany, and to the National Laborato-
ry of Metrology of Ionizing Radiation, Brazil.

Instruments used in diagnostic radiology mea-
surements can be tested in X radiation qual-
ities, using a Seifert X radiation system (160
kV) and a reference system with four ioniza-
tion chambers for diagnostic radiology mea-
surements (mammography, computed tomog-
raphy, fluoroscopy, radiation protection and
conventional diagnostic radiology ionization
chamber) traceable to the PTB, Germany (Fig.
17).

The types of instruments calibrated are: several
kinds of ionization chambers, pen dosimeters,
survey meters (including superficial contam-
ination detectors), alarm dosimeters, clinical
dosemeters and others. The distribution in
terms of levels of calibration is: 13 % for radia-
tion therapy, 10% for diagnostic radiology and
77% for radiation protection level.

Besides this service, 686 samples including
thermoluminescent dosimeters, alanina and
others, using beta, gamma and X radiation
were irradiated.

Since 2015, the LCI is undergoing an accredita-
tion process at INMETRO according to the ISO
IEC 17025 standard. All Quality System docu-
mentation was analyzed and the external au-
dit will be in 2017.