KAJIAN KANDUNGAN RADIOISOTOP ALAM DALAM SAMPEL BATUAN DI DESA OBEN BAUN KUPANG BARAT DENGAN TEKNIK ANALISIS RADIOAKTIVITAS LINGKUNGAN
Authors: Tay Maria Selviana , Johannes Albert Z. , Lapono Laura A. S. , Pasangka Bartholomeus 
Published: May 2019

Abstrak

Masalah pokok yang dikaji dalam penelitian ini adalah pemetaan dan analisis aktivitas jenis massa kandungan radioisotop dalam deposit mineral di Desa Oben Baun Kupang Barat. Tujuan Penelitian meliputi: menentukan kisaran cacah radiasi radioisotop alam di beberapa titik pengukuran di lapangan dan pengukuran di laboratorium, menentukan kisaran aktivitas jenis  massa (C) kandungan radioisotop dalam sampel batuan, memetakan sebaran cacah dan aktivitas jenis massa radioisotop pada luasan daerah  tertentu yang terjangkau survei di lapangan, dan mengestimasi tingkat kontaminasi radioaisotop pada lingkungan. Metode penelitian meliputi: observasi/ survei, mapping, sampling, analisis, interpretasi. Hasil-hasil penelitian: Kisaran cacah radiasi nuklir radioisotop di lapangan dan dilaboratorium dalam deposit mineral di Oben Baun Kupang Barat berturut-turut berkisar antara 15 cpm sampai dengan 93 cpm dan 28 cpm sampai dengan 92 cpm. Kisaran aktivitas jenis massa (C) kandungan radioisotop dalam 45 cuplikan sampel batuan di Oben Baun Kupang Barat berkisar antara 0,099 x 10-5 µCi/gram sampai dengan 0,316 x 10-5 µCi/gram. Sebaran atau distribusi kandungan radioisotop di Desa Oben Baun Kupang Barat yang dapat dijangkau survei terdistribusi lebih tinggi dari arah timur dan cenderung menurun ke arah barat. Distribusi tersebut masih cenderung tinggi ke arah utara di bagian timur lokasi survei. Kontaminasi radioisotop pada lingkungan masih tergolong kontaminasi rendah untuk radiasi alpha dan beta, dan secara umum cacah radiasi radioisotop di lapangan masih bersesuaian dengan  batas toleransi, walaupun perlu diwaspadai beberapa titik ukur dengan cacah radiasi melebihi standar.

Kata Kunci: Radioisotop, Aktivitas Jenis Massa, Daerah Kontaminasi.                                                                       

Abstract

The main problem studied in this research was mapping and analizing of mass specific activity of radioisotope content in mineral deposit at Oben Village Baun West Kupang. The aims of research comprise of: to determine radiation counts range of natural radioisotope at several measurement points at field and Laboratory, to determine counts and massa specific activity range of radioisotope content in rocks sample,  to map distribution of counts and  mass specific activity on area which was reached of field survey, and to estimate contamination level of radioisotope on environment. The methods of research consists of: Observatlion/ surveying, mapping, sampling, analyis, and interpretation. The results of research: The counts range of nuclear radiation of radioisotope at field and laboratory in mineral deposit at Oben Baun West Kupang in succession revolved between 15 cpm up to 93 cpm and 28 cpm up to 92 cpm. The range of mass speciific activity of radioisotope content in 45 rock samples at Oben Baun West Kupang revolved berween 0,099 x 10-5µCi/gram up to 0,316 x 10-5 µCi/gram. The distribution of radioisotope content at Oben Village Baun West Kupang which can be reached survey higher distributed from east direction and inclined decrease to west direction. These distribution still high inclined to nort direction at east part of survey location. Radioisotope contamination on environment still classified low contamination for alpha and beta radaition, and generally radiation counts of radioisotope at the field still to be appropriated with tolerance limit, although was necessary waried several measurement points with radiastion counts exceed of standard.                     

Keywords : Radioisotope, Mass Type Activity, Area Contamination.