National comparison of activity measurements of ¹³¹I, ⁶⁰Co, and ¹³³Ba in Indonesia.

National comparisons of radioactivity measurements of (131)I and (60)Co (in 2010) and of (133)Ba (in 2011) were carried out within the framework of the National Radiation Metrology Laboratory Program of Indonesia, coordinated by PTKMR-BATAN. Eleven laboratories took part in the comparison, and all measurements were made using gamma spectrometry, on point sources with an activity between 2000Bq and 6000Bq. Several laboratories reported values which were more than 10% different from the reference value for (131)I and (133)Ba.

Direct measurement of ⁶⁰Co and ¹²⁵I activity by the sum-peak method in PTKMR-BATAN.

The sum-peak method was successfully applied to the determination of the activity of (60)Co and (125)I sources measured by HPGe and well-type NaI(Tl) detectors in PTKMR-BATAN. The result of the (60)Co activity agrees with the activity value measured by using a calibrated ionization chamber within a range of about 0.35-0.

Testing of a prototype of calibration facility for noble gas monitoring using 41Ar.

A prototype of a calibration facility for noble gas monitoring using (41)Ar in the PTKMR-BATAN has been tested. The facility was designed in such a way that the standard source of gas can be reused. The radioactive (41)Ar source was obtained by thermal neutron reaction of (40)Ar(n, γ)(41)Ar using a thermal neutron flux of 4.

Standardization of 125I and 109Cd by the photon-photon coincidence method in PTKMR-BATAN.

A photon-photon coincidence system was constructed for the standardization of (125)I and (109)Cd in PTKMR-BATAN, Indonesia. Two NaI(Tl) detectors of 76 mm diameter × 6mm thickness with 0.5mm aluminum window were used, which were positioned approximately symmetrically to the source holder.

Performance evaluation of commercial radionuclide calibrators in Indonesian hospitals.

Dose calibrator is one of the supporting equipments in the field of nuclear medicine. At the hospitals, dose calibrator is used for activity measurement of radiopharmaceutical before it is administered to patients. Comparison of activity measurements of (131)I and (99m)Tc with dose calibrators was organized in Indonesia during 2007-2010 with the the aim of obtaining information dose calibrator performance in the hospitals.

Radioactivity measurement of 18F in 16 ml vials for calibration of radionuclide calibrators.

Fluorine-18 is obtained through the reaction (18)O(p, n)(18)F using a cyclotron that is situated in a hospital in Jakarta. Standardization of the (18)F solution is performed by gamma spectrometry using calibration sources of (152)Eu, (60)Co and (137)Cs that have traceability to the International System of units (SI). The activities in the 16 ml vials that were used for calibrating the radionuclide calibrators were between 1 and 2 GBq, with expanded uncertainties of 3.

Laboratories new to the ICRM.

The Scientific Committee of the ICRM decided, for the 2011 Conference, to present laboratories that are at a key developmental stage in establishing, expanding or applying radionuclide metrology capabilities. The expansion of radionuclide metrology capabilities is crucial to meet evolving and emerging needs in health care, environmental monitoring, and nuclear energy. Five laboratories (from Greece, Lithuania, Indonesia, Norway and Turkey) agreed to participate.