Thirteen (13) rivers flowing in the city of Jakarta and Ciliwung is one of them. This river flows through residential, offices, industrial and factories. Activities that exist around the river can cause rivers to become polluted. River sediments act as a potential sink for many hazardous chemicals that can be used as indicators for pollution monitoring of the river. The objective of this study is to assess the heavy metal contamination in the Ciliwung river sediment based on single and combination indices. For the assessment of the Ciliwung sediment quality, measurements of metal concentration in river sediments have been performed. Sampling was carried out at four sampling locations, namely in Kelapa Dua, Kalibata, Condet, and Depok. Analysis of heavy metals in the sample was carried out using instrumental neutron activation analysis method. The analysis result shows that the detected elements in sediment include: Br, Al, As, Ca, Ce, Cr, Co, Cs, Mg, Mn, Na, Sb, Eu, Fe, Hf, K, Sc, Sm, Ta, Tb, Th, Yb, and Zn. The assessment based on the value of the enrichment factor indicates that there has been an increase in the concentration of heavy metals As, Cr, Sb, and Zn in moderate levels due to anthropogenic factors. Based on the geo accumulation index value, it is known that the sampling area is not polluted to moderate contamination. Heavy metals As, Cr, Sb, and Zn in sediments provide a low level of ecological risk to the aquatic environment. Based on the pollution load index value (PLI), all sampling locations are in no pollution conditions. From the evaluation, it can be seen that even for some heavy metals namely As, Cr, Sb, and Zn has been an increase in the concentration value but has not yet reached the polluted level and the ecological risk of heavy metals in the sediments also still provides a low ecological risk.

Fe is an essential macro element that humans need to carry out their physiological processes. Although many factors that cause stunting cases in Indonesia, Fe anemia in pregnant women, breastfeeding women and infants under two years is believed to be one of the causes of stunting. This study will determine the content of Fe in 73 types of local food from Mamuju Regency, West Sulawesi Province. The information can be useful in preventing stunting, especially stunting caused by iron deficiency. The Fe element is determined using a neutron activation analysis technique that utilizes the G.A. Siwabessy Multipurpose Reactor. The sample irradiation was carried out at a rabbit system that has a thermal neutron flux of about 3.1013 n.cm−2.sec−1. Data acquisition of gamma-ray emitted from target irradiated was performed using gamma-ray spectrometry coupled to the high-resolution detector. Fe concentration in foodstuffs was calculated using the NAA-comparative method. The results showed that green vegetables such as kangkung (Ipomoea Aquatica Forsk), bayam (amaranthus spp), kemangi (ocimum citriodorum), daun pakis (diplazium esculentum), daun katuk (sauropus androgynous), daun seledri (Apium graveolens), daun singkong (cassava leaves), cesim (brassica rapa) and buncis (phaseolus vulgaris) have an elemental content of Fe > 100 mg/kg. Kangkung, bayam, and kemangi are green vegetables that are rich in the element Fe, the concentration of Fe in the vegetables more than 280 mg/kg. Concentrations of Fe minerals in vegetables are higher compared to Fe minerals in beef or other protein sources. The green vegetables are suitable foodstuff to overcome Fe anemia in pregnant women, breastfeeding women and infants under two years.

The 2017 IAEA Proficiency Test Program has been carried out to improve the performance of the Neutron Activation Analysis (NAA) laboratory. This activity has been organized by the International Atomic Energy Agency (IAEA) cooperated with Wageningen Evaluating programs for Analytical Laboratory (Wepal). Eight samples of ISE (soil samples) and IPE (plant samples) obtained from Wepal under the 2017 Proficiency Test program. Moisture content has been determined using a gravimetric method at 105-110 C and 100-105 for ISE and IPE samples respectively. Target irradiation was carried out for long, medium, and short irradiation using a thermal neutron flux of about 2.3x1013 n.cm−2.s−1 at the rabbit facility of GA Siwabessy reactor. Elemental analysis has been done using kay zero (k0) and comparative method of Instrumental Neutron Activation Analysis (INAA). On the kay zero-INAA method, the Al-0.1%Au alloy of IRMM-530R has been used as a flux monitor. Short half-life radionuclide was calculated using an Excel program for the comparative method and correction for a dead and counting time was applied. Quantitative determination has been carried out on a dry weight basis. The water content of the IPE sample was higher than that of the ISE sample. The result of the moister content of the IPE sample was in the range of 8% to 10%; meanwhile the moister content of the ISE sample was 2% to 6%. The elements detected on the IPE samples were less than that on the ISE sample. The elements of Na, Mn, V, Cl, Sc, Fe, Co, Zn, As, Br, Rb, Zr, Sb, Cs, Ba, La, Ce, U, and Th have been determined on ISE sample. In the meantime, for IPE sample, the elements of K, Na, Mn, Cl, Mg, Al, Ca, Cr, Fe, Co, Zn, Br, Rb, Sr, Sb, Cs, La, and Th can be evaluated quantitatively. Most of the elements evaluated have Z-score and Zeta-score of-3 to +3, which indicate good analytical performance for some elements, but for the element, some of them are out layer.

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