Abstract : Specific activities of natural (40K, 226Ra and 232Th) radionuclides in 250 beach sand samples collected from 5 beaches in 5 districts which are Rachadapisek beach in Nong Chick district, Talokapo beach in Yaring district, Panarae beach in Panarae district, Wasukri beach in Saiburi district and Pamai beach in Mai Kaen district in Pattani province, have been studied and measured....
Generally, Plasma consists of ions, electrons and neutrals. Neutrals are the product produced much higher than other two products, but only ions and electrons are used for surface material modification. Electron cyclotron resonance is one of the techniques to apply external magnetic field in order to increase ions and electrons of produced plasma. This work aim to study influence of external...
Zinc injection has been proven to be an effective protocol for corrosion mitigation in nuclear industry. However, the role of zinc ions in this process is still not fully understood. In the present research, effort has been made to investigate the zinc effect on the corrosion of SS 304 specimens immersed in H$_2$O$_2$ solutions with addition of zinc. The surface morphology and chemical...
Currently, production of an air plasma jet is the remarkable innovation that converts air to heal infected wounds. The aim of this research is characterizing air plasma jet in burst mode. Plasma power is varied by pulse delay from 5 to 40 μs at fixed pulse width and the number of pulse from 2 to 10 pulses at fixed burst mode frequency. Then, plasma radicals are determined using Optical...
Nowadays, Fertilizer is very necessary in agriculture cause of soil problem. It has many ways to produce and Cold Atmospheric Plasmas is the one way which has been examined earnestly for along time. It can generate many energetic species of ionized gas in ambient air, especially they can produce reactive nitrogen species (Nitrite 〖NO〗_2^-, Nitrate〖 NO〗_3^-) [2-3] which they are essential...
Ozone is a very strong oxidizing agent, widely used in industrial, environmental and agricultural applications. Ozone generated by ozonizer, when air or oxygen ionized to form plasmas under high-frequency and high-intensity electric field. The intensity of electric fields depend on electrode geometry, gap size, applied voltage and dielectric materials. In this study, effects of electrode...
Riceberry brown rice is known for its valuable nutrients with texture similar to white rice. Recently our group has used plasma treatment on riceberry brown rice to effectively shorten their cooking time and soften their texture. During plasma treatment, rices were also subject to elevated temperature. This sometime has lead to confusion whether the thermal effect dominate. In this study we...
Works in this project are focused on the optimization and design of a beam shaping assembly (BSA) for the boron neutron capture therapy (BNCT) based on a 30 MeV proton beam generator. The aim is to maximize the epithermal neutron flux and prevent the background radiation which is required for the BNCT designation. A set of material and geometry simulations are examined as neutron multiplier,...
While the cross sections of heavy ion beams at energy of a few MeV and above have been measured and reported, experimental data, especially of those minor lines from uncommon materials, for lower-energy heavy ion beams around 1 MeV are lack. In this study, we used 1-MeV C-ion (83 keV/amu) PIXE (particle induced X-ray emission) to measure the X-ray production cross sections of Fe K-line, Nb, Ru...
This paper describes the upgraded collimator and shielding design principle for the prompt gamma neutron activation analysis (PGNAA) facility at Thai research reactor. The neutronic calculations with different geometry and material conditions are simulated using the Monte Carlo code. Then, the optimal parameters to maximize the thermal neutrons and minimize background radiations are obtained....
Multipole Resonance Probe (MRP) can be used to determine plasma parameters including plasma density. This project is divided into 2 parts. The first involves simulation of dissipation power by using MATLAB analytical program. The second part is the construction of MRP. The locally made probe is used to characterize DC plasma at the electrical input power of 0, 24, 31.35, 60 and 91.74 watts and...
Nowadays, plasma technology has an important role in medical treatment. It is used to help Diabetes Miletus patients with chronic wounds and patients with bedsore to get more effective treatment. It is also used as bactericidal method. This research studied an air plasma jet with the efficiency in inhibitory of Staphylococcus aureus. The study aimed to study the effect of number of pulse and...
Surface properties of Poly (ethylene terephthalate) or PET fabric were modified by nitrogen plasma pretreatment, chitosan pretreatment and combined of nitrogen plasma - chitosan pretreatment, to improve ink absorption of water-based pigmented inkjet ink. The samples were exposed to the plasma at the operating pressure of 0.8 mbar. The operating RF powers were varied from 50-100 W. The...
In the present study, thin films of polyaniline conductive polymer have been deposited on glass substrate by AC Plasma Polymerization. Doped and undoped films were synthesized at the AC discharge voltage between 450 - 500 V, operating pressure of 0.13 and 0.14 Torr and the reaction time were set at 5, 10, 15, 20 and 30 minutes. For doped films, iodine powder was put inside the deposition...
We had performed computer simulations by using FLUKA code for investigating the gamma-ray shielding properties of the xPbO-(50-x)BaO-50B$_2$O$_3$ glass system (where $ 5 \leq x \leq 45 $ mol$\%$) for the 356, 662, 1173, and 1330 keV photons (gamma-ray) energies. Then we compared the results to the XCOM program and the experimental data. We found , the results agree very well with the XCOM and...
We had investigated the efficacy of FLUKA Monte Carlo (MC) code for the gamma radiation shielding parameter calculation of the (60-x) PbO-x Li$_2$O-40 B$_2$O$_3$ (where $0 \le \text{x} \le 25$ mol%) glass system. The mass attenuation coefficients $(\mu_m)$, the effective atomic number $(Z_{eff})$, the effective electron density $(N_{el})$, mean free path $(MFP)$ and half value layer $(HVL)$...
