VALIDASI ETNA (EFFICIENCY TRANSFER FOR NUCLIDE ACTIVITY MEASUREMENTS) UNTUK ANALISIS SAMPEL RADIOAKTIVITAS LINGKUNGAN DENGAN SPEKTROMETRI GAMMA

• Main Authors: , KHUSNUL WICAKSONO SUKOWATI, , Ir. Gede Sutresna Wijaya, M.Eng.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/124258/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=64378
• Institution: Universitas Gadjah Mada

R esearch s were carried out to ETNA validation for environmental radioactivity sample analysis by means of gamma spectrometry in Low Background Radioactivity Laboratory, PTAPB-BATAN. The main objective of this study was to determine the validity of ETNA in calculate the efficiency of radioactivity measurements of a number of samples which have geometry that is different to the calibration geometry, and also to find the optimal geometry for measuring and calibrating processes. counting The study was conducted by 152 Eu and 241 Am standard point source with source-to-detector distance variations of 5 cm, 10 cm, 15 cm, 20 cm, 25 cm, and 30 cm, and the IAEA 373 and IAEA 375 cylindrical standard with source-to-detector distance variations of 0 cm, 5 cm, and 10 cm. The efficiency of each energy and distance measurements was calculated and then compared with the results of ETNA calculation to know the difference. Point source measurement produced difference of above 10% for a distance of 5 cm and above 5% for a distance of 10 cm. The smallest difference, which were in range 0.03% - 4.6%, were obtained by using 25 cm source-to-detector distance as geometry calibration, with measurements geometry of above 15 cm. In the measurement of the cylindrical source, the smallest differences of 9.34%, 2.70%, and 2.80% were obtained for IAEA 373 standard, and 3.50%, 0.012%, and 1.17% for the IAEA 375 standard in the distance of, respectively 0 cm, 5 cm, and 10 cm, by using calibration geometry of point source within 5 cm of source-todetector distance.