Kupang. Metode penelitian yang dilakukan adalah metode eksperimen, Pengukuran
dosis radiasi dilakukan dengan mengukur laju paparan radiasi sebelum menembus
celah kaca Pb dan setelah melewati kaca Pb dengan menggunakan alat ukur radiasi
surveymeter. Titik pengukuran paparan radiasi dengan surveymeter dilakukan dengan
Hasil pengukuran laju paparan radiasi pada kaca yang digunakan sebagai
proteksi radiasi pada keenam titik pengukuran dengan menggunakan surveymeter
adalah 0,6 mR/jam, dibandingkan dengan NBD untuk radiografer (2,5 mR/jam) maka
nilai laju paparan radiasi pada ruang operator dinyatakan aman.
Kata kunci: paparan radiasi, kaca Pb, ruang operator
Anomaly of seismic velocities gives brief information about slab detachment and subduction. Java Islands which has complicated features and lying upper ring of fire is interested to understand its subduction zone. Slab Detachment in Java Islands gets massive impacts from plate in its surrounds. Indo-Australian plate and also Eurasian plate are examples of plates which adjacent with Java islands. Java islands also part of Sunda-Arc subduction system which elongated from Sunda Strait. It bordered by Sumatera islands in the west and Nusa Tenggara Islands in the east. Plate interaction between Java islands and massive plates in its surround makes earthquake in Java islands often occurred. Imaging subsurface features of Java Islands using tomography seismic. It reflects seismic velocity which propagated through the earth following thus wave characteristics.