Judul: Simulasi Monte Carlo Perisai Radiasi Proton dengan Variasi Beton Menggunakan Particle and Heavy Ion Transport code System (PHITS)
Abstrak: Perisai radiasi proton merupakan pelindung fisik yang digunakan untuk mengurangi laju radiasi pada lingkungan sekitar. Material yang paling umum digunakan sebagai perisai adalah beton. Penggunaan sotware berbasis Monte Carlo sebagai simulasi transportasi partikel banyak digunakan dalam bidang medis dan fisika nuklir, salah satunya perisai radiasi. Penelitian ini melakukan simulasi numerik menggunakan software PHITS berbasis monte carlo untuk mengetahui redaman proton saat melewati perisainya dengan variasi energi proton, jumlah partikel, ketebalan material perisai, jarak antara sumber dan perisai, dan jenis material perisai. Hasil simulasi yang didapatkan menunjukkan bahwa variasi terbaik yang didapatkan dalam perancangan perisai untuk terapi proton adalah material dengan dua lapisan, dimana lapisan 1 adalah beton (ρ=5,0 g/cm3) dan lapisan 2 adalah besi (ρ=7,0 g/cm3), dengan ketebalan perisai 10 cm dan jarak antara sumber dan perisai 20 cm, untuk material satu lapisan didapatkan perisai terbaik dengan densitas beton (ρ=2,31 g/cm3), dengan ketebalan 50 cm dan jarak 100 cm., A proton radiation shield is a physical shield placed between the ionization source and the object or target to be protected to reduce the rate of radiation dose in the surrounding environment. The most common material used as a shield is concrete. In medical and nuclear physics field, such as radiation shielding, Monte-Carlo-based software is commonly utilized as a particle transport simulation. This study conducted a numerical simulation using PHITS software based on Monte Carlo to determine the attenuation of protons passed the shield with variations in the proton energy, the number of particles, the thickness of the shielding material, the distance between source and shielding, and the composition of the shielding material. The results show that the best shield design variation is with two layers of material, layer 1 is concrete (ρ = 5,0 g/cm3) and layer 2 is iron (ρ=7,0 g/cm3) with a thickness of 10 cm, and a distance of 20 cm between the source and shielding, and the best shield is obtained with one layer of material with a density (ρ=2,31 g/cm3), the thickness of 50 cm, and a distance of 100 cm.
Keyword: Concrete, Monte Carlo, PHITS, Proton, Radiation Shielding

Judul: Synthesis of Neutron Radiation Shields Based on Concrete With filler Palm Fiber and Coconut Shell Powder.
Abstrak: Radiasi neutron merupakan radiasi pengion yang memiliki daya tembus yang tinggi, sehingga diperlukan perisai radiasi untuk mengurangi bahaya radiasi neutron. Telah dilakukan sintesis beton dengan filler serat ijuk dan serbuk batok kelapa sebagai perisai radiasi neutron. Bahan perisai radiasi dibuat dengan menggunakan pasir lukulo, semen, kapur, split, air dan penambahan filler serat ijuk dan serbuk batok kelapa sebesar 5%, 10%, dan 20%. Eksperimen ini menggunakan Energy-dispersive X-ray spectroscopy (EDS) untuk analisis unsur. Pengujian serapan neutron menggunakan teknik radiografi neutron dengan metode film menunjukkan bahwa nilai tampang lintang makroskopik (Ʃ) memiliki karakteristik fungsi eksponensial terhadap tebal perisai beton untuk filler serat ijuk 5% yaitu 0,2538 cm-1, filler serat ijuk 10% yaitu 0,2604 cm-1, filler serat ijuk 20% yaitu 0,2754 cm-1, filler serbuk batok kelapa 5% yaitu 0,214 cm-1, filler serbuk batok kelapa 10% yaitu 0,2179 cm-1, filler serbuk batok kelapa 20% yaitu 0,2408 cm-1. Nilai tampang lintang makroskopik (Ʃ) meningkat seiring bertambahnya kadar filler., Neutron radiation is ionizing radiation that has high penetrating power, so radiation shielding is needed to reduce the danger of neutron radiation. Concrete synthesis has been carried out using palm fiber filler and coconut shell powder as a shield for neutron radiation. Radiation shielding material was made by using lukulo sand, cement, lime, split, water, and the addition of 5%, 10%, and 20% of filler fibers and coconut shell powder. The experiment used Energy-dispersive Xray spectroscopy (EDS) for elemental analysis. The neutron absorption test using the neutron radiography technique with the film method showed that the value of the macroscopic cross section had a characteristic exponential function of the thickness of the concrete shield for 5% palm fiber filler, namely 0,2538 cm-1, 10% palm fiber filler that was 0,2604 cm-1, palm fiber filler 20% is 0,2754 cm-1, coconut shell powder filler is 5% that was 0,214 cm-1, 10% coconut shell powder filler was 0,2179 cm-1, coconut shell powder filler 20% was 0,2408 cm-1. The value of the macroscopic cross section rose as filler content increasing.
Keyword: Beton, perisai radiasi neutron, serat ijuk, serbuk batok kelapa, tampang lintang makroskopik, Coconut shell powder, concrete, macroscopic cross section, neutron radiation shielding, palm fiber

Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
Keyword: