Nuclear technology can be applied not only as an energy (electricity) but also in industry as as an initiator on polymer reaction. Tapioca waste is used due to its biodegradability properties. Tapioca waste gel is formed by adding equal aquades ratio to waste weight. After gel formed, several concentrations of methyl methacrylate (w/w) is added to the gel then packed into 150 mL ampule. Using Co-60 gamma irradiation source, gel is irradiated at 5 kGy absorbed dose. Gel is extracted using acetone to get rid of sample from impurities. Glycerol as a plasticizer is added to the gel to increase polymer flexibility. Gel-Glycerol mixing is done at 60ºC, 250 rpm for one hour by adding aquadest. To analyze mechanical properties, firstly, we need to mold samples using pressurized-hot press machine. Film is formed to type 5 specimen (dog bone, astm d638-14). Specimen is tested by analyzing tensile strength characteristics. Fabrication of biodegradable plastic based packaging by using starch has an increasement of mechanical and thermal properties at 5 kGy absorbed dose. Methyl methacrylate 25, 50, 75, 100, 125 and 150% addition to the solution has 10-24 MPa tensile strength. Gel fraction has range between 88-100%. Even the lowest ratio of monomer addition can provide highest gel fraction to improve mechanical properties of tapioca waste.

Zeolite‐g‐polyacrylamide is prepared by using the radiation induced grafting technique. Clinoptilotite, a natural zeolite, is used as the base matrix. In order to increase the degree of grating of polyacrylamide into the zeolite, its surface is modified with silane compound before the grafting reaction and applied a poor solvent method in the grafting reaction, i.e., a mixture of toluene and H2O. The irradiation doses are varied from 10 to 50 kGy. The grafting parameters are 40% w/w acrylamide, temperature 60 °C and 3 h grafting time. The highest degree of grafting is 93% at an irradiation dose of 25 kGy. The zeolite‐g‐polyacrylamide is then characterized with FTIR spectroscopy and SEM observation. Batch experiments are also carried out to investigate the adsorption capacity for ion Cr3+, Pb2+, and Zn2+. The maximum adsorption capacities of zeolite‐g‐polyacrylamide are 544, 345, and 1046 mg g−1 for ion Cr3+, Pb2+, and Zn2+, respectively. The equilibrium data are also tested with Langmuir and Freundlich isotherm to find the best suitable adsorption isotherm system.

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The bacterial cellulose‐co‐polyacrylamide (BC‐PAAM) is successfully synthesized by radiation‐induced graft polymerization using gamma rays with the simultaneous technique. The optimum irradiation dose applied is 50 kGy and the mass ratio among acrylamide (AAm) and bacterial cellulose (BC) is 1:4. The sorption of aqueous Cu and Pb onto BC‐PAAM is investigated in the relation of pH 3 and 5. The heavy metal ions are applied as single during adsorption study. The sorption uptake of the metal ions by BC‐PAAM shows that the adsorption capacity is higher at pH of 5 compared to the adsorption capacity of pH 3, both for Cu and Pb metal ions. The adsorption capacity obtained in the condition of pH 5 is 20.88 and 81.79 mg g−1 for Cu and Pb, respectively. While the adsorption efficiency in pH 5 is 29.54% (for Cu) and 92.76% (for Pb). The adsorbent (before and after metal ions uptake) is characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry.

Air merupakan sumber kehidupan bagi seluruh makhluk penduduk di dunia. Semua makhluk hidup sangat membutuhkan air untuk perkembangan dan pertumbuhannya. Siklus air berarti bahwa jumlah air di dunia dijaga konstan. Misalnya, pengelolaan air yang tidak memadai di musim hujan menyebabkan erosi dan banjir, sedangkan di musim kemarau menjadi kering dan sulit untuk mengamankan sumber air. Hal di atas merupakan salah satu permasalahan yang kita hadapi dalam pembangunan dan pengelolaan sumber daya air. Kita harus menyelesaikan masalah ini secepat mungkin. Untuk itu diperlukan pengelolaan sumber daya air yang baik dan pengelolaan yang baik dalam pembangunan, yang berdampak pada keberlanjutan dan keseimbangan lingkungan saat ini dan di masa yang akan datang. Jumlah penduduk yang semakin meningkat setiap tahunnya di Kota Bukittinggi dan aktivitas masyarakat disekitar daerah aliran sungai (DAS) yang semakin beragam serta kebutuhan akan air semakin meningkat menyebabkan masalah keseimbangan antara kebutuhan dan ketersediaan air. Embung untuk menampung air dengan memperhitungkan curah hujan di sekitar daerah tersebut dan dapatnya terpenuhi atau taraf hidup masyarakat di daerah tersebut dapat meningkat. Dalam perencanaan embung, diperlukan data curah hujan yang diolah dengan distribusi Normal, distribusi Log normal, distribusi Gumbel, dan distribusi Log Type III, dan di uji dengan perhitungan debit banjir dengan menggunakan metode Rasional dan Wer Duwen agar mendapatkan hasil yang diinginkan lalu. Dengan luas DAS 17,45 km2 dan daya tampung mencapai 5040 m3 didapatkan dimensi embung dengan tinggi 9 m, lebar mercu 8 m, lebar dasar 40 m, elevasi mercu +21,99 m, elevasi dasar +14,00 m, kemiringan hulu 2,8, dan kemiringan hilir 2,1.Kata Kunci : Embung, Distribusi, Data Curah Hujan.