Malaysian Institute for Nuclear Technology Research MINT

Bangi, Malaysia

Malaysian Institute for Nuclear Technology Research MINT

Bangi, Malaysia
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Hasnimulyati L.,University Putra Malaysia | Halimah M.K.,University Putra Malaysia | Zakaria A.,University Putra Malaysia | Halim S.A.,University Putra Malaysia | Ishak M.,Malaysian Institute for Nuclear Technology Research MINT
Materials Chemistry and Physics | Year: 2017

A series of glass samples with composition {[(TeO2)0.7(B2O3)0.3]0.7[ZnO]0.3}1-x{Tm2O3}x was prepared by using the melt-quenching technique. Then, the samples were characterized by using the densimeter, FTIR and ultrasound technique. The variations of density, molar volume, ultrasonic velocity, elastic moduli, and Poisson's ratio were discussed and correlated with the composition of the glass samples and the FTIR spectra. It was found that the addition of thulium caused bridging and non-bridging oxygen to be formed at the same time due to the different effect that occur to tellurite and borate network as thulium is added. As thulium is varied from 1 until 3 mol%, bridging oxygens had been found to occur at a high rate and caused the ultrasonic velocity to increase. Nonetheless, when thulium oxide exceeded 3 mol%, non-bridging oxygens formed at a high rate. As a result, ultrasonic velocity was reduced. Furthermore, the values of elastic moduli (including bulk, shear, Young's modulus, and Poisson's ratio) were compared with the data that were calculated theoretically by using bulk compression, Makishima-Mackenzie, and Rocherulle models. © 2017 Elsevier B.V.


Ismail H.,Universiti Sains Malaysia | Munusamy Y.,Universiti Sains Malaysia | Mariatti M.,Universiti Sains Malaysia | Ratnam C.T.,Malaysian Institute for Nuclear Technology Research MINT
Malaysian Journal of Microscopy | Year: 2010

In this paper, we demonstrate the effect of organoclay dispersion on the thermal degradation and flammability of ethylene vinyl acetate (EVA)/ natural rubber (SMR L)/organoclay thermoplastic elastomer (TPE) nanocomposites. EVA/SMR L/organoclay TPE nanocomposites were melt compounded in an internal mixer, Haake Rheometer, at 120°C and 50 rpm rotor speed. The EVA: SMR L ratio was fixed at 50: 50 meanwhile the organoclay loading was varied from 2 to 10 phr (parts per hundred resins). Thermogravimetric analysis (TGA) showed that thermal stability of the nanocomposites was improved with incorporation of organoclay. Furthermore, flammability of nanocomposites was reduced dramatically with incorporation of only 8 phr organoclay. Results from transmission electron microscope (TEM), showed that the organoclay particles which consists of individual silicate layers in ordered structure, were intercalated and exfoliated in the nanocomposites at 2 phr loading. When the organoclay loading increased up to 8 phr, agglomerates was observed. Scanning electron microscope (SEM) micrographs revealed that nanoscale dispersion of organoclay leads to formation of compact char on the surface of polymer matrix which acts as protective barrier layer.


Rahman M.M.,International Islamic University Malaysia | Yusof A.M.,University of Technology Malaysia | Wood A.K.H.,Malaysian Institute for Nuclear Technology Research MINT | Shamsiah A.,Malaysian Institute for Nuclear Technology Research MINT
Advanced Materials Research | Year: 2011

A simple and less expensive solvent extraction method was used with inductively coupled plasma mass spectrometry (ICP-MS) in the speciation of two environmentally significant, toxic forms of arsenic: arsenite and arsenate. Dissolved inorganic arsenic species in drinking waters from reservoirs and treatment plants were determined by the inductively coupled plasma mass spectrometry analyses. Prior to the analysis the water samples were precocentrated by solvent extraction using APCDT to separate the arsenic species from elemental interferences. The detection limit of this method achieved was 0.059 μgL-1. The suitability of the technique in this work is discussed in relation to risk assessment studies of public health. © (2011) Trans Tech Publications, Switzerland.


Shafaei M.A.,University Putra Malaysia | Saion E.,University Putra Malaysia | Wood K.,Malaysian Institute for Nuclear Technology Research MINT | Naghavi K.,University Putra Malaysia | Rezaee K.,University of Isfahan
Journal of Radioanalytical and Nuclear Chemistry | Year: 2011

Some vegetables of important nutritive requirements have been collected from Kuala Lumpur region capital of Malaysia. The vegetables were analyzed in order to determine activity concentration level of potassium using neutron activation analysis (NAA). The NAA results obtained showed the activity concentration of 40K varied from 379 Bq/kg (Egg-plant) to 1585 Bq/kg (Spinach Red). These results are compared to other researches and are clear that the concentrations of K are relatively high in the Malaysia in compared to rather than vegetables of Pakistan and Jamaican. However, they are seen not to pose any serious internal health burden due to ingestion given the realities of vegetables choice by individuals in the study area. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Yazid H.,University of Malaya | Yazid H.,University Malaysia Perlis | Arof H.,University of Malaya | Yazid H.,Malaysian Institute for Nuclear Technology Research MINT | And 3 more authors.
NDT and E International | Year: 2011

Automated detection of welding defects in radiographic images becomes nontrivial when uneven illumination, contrast and noise are present. In this paper, a new approach using surface thresholding method is proposed to detect defects in radiographic images of welding joints. In the first stage, several image processing techniques namely fuzzy c means clustering, region filling, mean filtering, edge detection, Otsu thresholding, and morphological operations method are utilized to locate the area where defects might exist. This is followed by the construction of the inverse thresholding surface and its implementation to locate defects in the identified area. The proposed method was tested on 60 radiographic images and it obtained 94.6% sensitivity. Its performance is compared to that of the watershed segmentation, which obtained 69.6%. © 2011 Elsevier Ltd.


Yazid H.,University of Malaya | Yazid H.,University Malaysia Perlis | Arof H.,University of Malaya | Yazid H.,Malaysian Institute for Nuclear Technology Research MINT
Nondestructive Testing and Evaluation | Year: 2012

Automated detection of welding defects in radiographic images becomes non-trivial when uneven illumination, contrast and noise are present. In this paper, a new surface thresholding method is introduced to detect defects in radiographic images of welding joints. In the first stage, several image processing techniques namely fuzzy c means clustering, region filling, mean filtering, edge detection, Otsu's thresholding and morphological operations method are utilised to locate the area in which defects might exist. This is followed by the implementation of inverse surface thresholding with partial differential equation to locate isolated areas that represent the defects in the second stage. The proposed method obtained a promising result with high precision. © 2012 Taylor & Francis.


Laoding H.,University Putra Malaysia | Mohamed Kamari H.,University Putra Malaysia | Zakaria A.,University Putra Malaysia | Shaari A.H.,University Putra Malaysia | Mansor I.,Malaysian Institute for Nuclear Technology Research MINT
Materials Science Forum | Year: 2016

A series of Tm-doped zinc borotellurite glass have been extracted by conventional meltquenching method. The density was measured and it had been found that the value is increased by the increment of Tm3+ ion. The elastic properties of the sample were determined by measuring longitudinal and shear velocities using an ultrasound technique. Then the values inserted into equations that calculate the elastic moduli of the glass samples. These include longitudinal, shear, bulk, Young’s modulus and also the Poisson’s ratio. The longitudinal and shear velocities show an increment as Tm3+ increases from 0.01 to 0.03 mol content. The trend then changes as Tm3+ increases from 0.03 to 0.05 mol content. In terms of elastic moduli, it produces a rapid increment with Tm3+ until 0.03 mol content. But after that, the increment becomes slow until 0.05 mol of Tm3+. The value of Poisson’s ratio decreases with the addition of Tm3+ concentration. © 2016 Trans Tech Publications, Switzerland.


Leo C.P.,Universiti Sains Malaysia | Linggawati A.,National University of Malaysia | Mohammad A.W.,National University of Malaysia | Ghazali Z.,Malaysian Institute for Nuclear Technology Research MINT
Journal of Applied Polymer Science | Year: 2011

Nylon-66 is a typical semicrystalline polymer that can be crosslinked using crosslinking agents and electron beam irradiation. Hybrid nylon-66-based membranes are more porous but denser compared to the pure nylon-66 membrane. Besides that, hybrid nylon-66 membranes exhibit higher water uptake and severe swelling in water. Si/nylon-66 membranes were prepared by adding γ-aminopropyltriethoxylsilane (APTEOS). Crosslinked silica in nylon-66 membranes is confirmed with high gel content and Fourier transform infrared peaks, but XRD results showed that there is a low crystalline degree in these membranes. The thermal stability of hybrid nylon-66 membranes is also less affected by APTEOS. The crosslinking agent only improves storage modulus in hybrid nylon-66 membranes. After irradiation, it is learned that APTEOS improves separation performance of nylon-66 membranes. However, excessive APTEOS causes the ratio of effective thickness over porosity (Δx/Ak) reduces significantly resulting a lower permeability membrane. Copyright © 2010 Wiley Periodicals, Inc.


Shafaei M.A.,University Putra Malaysia | Saion E.,University Putra Malaysia | Wood K.,Malaysian Institute for Nuclear Technology Research MINT | Halimah M.K.,University Putra Malaysia | And 2 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

Potassium is an extremely important major to element to the human body. Potassium in made up of three isotopes with abundances of 39K at 93.1%, 40K at 0.0118% and 41K at 6.88%. It is also very well known that 40K is to measure the single 1460.8 keV photon from beta-decay. However, this procedure requires a significant amount of sample and typical counting periods of at least a day in well-shielded germanium counting system. Another approach is to determination total potassium via neutron activation analysis using the well know 41K (n,γ) 42K(T 1/2 = 12.8 h) reaction and then evaluate 40K using the usual activity equation A = λN. In our laboratory we have effectively used thermal and epithermal neutron flux for neutron activation analysis to determine potassium in fruits. Upward to 7-9 batches of samples, which each of batch is including 14 samples so can be analysed in 1 day using only gram quantities of material. In such way on can increase the output of determining 40K by at least on order of magnitude. Result of a detailed investigation optimization of the methodology, quality control and detection limits will be presented for reference material and various fruits samples. © 2010 Akadémiai Kiadó.


Rezaee Kh.,University Putra Malaysia | Saion E.B.,University Putra Malaysia | Wood A.K.,Malaysian Institute for Nuclear Technology Research MINT | Abdi M.R.,University of Isfahan
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

Results obtained from the analysis of sediments surface samples taken from rivers mouth and polluted marine environment were analyzed for REE contents to determine the concentrations of La, Ce, Sm, Eu, Tb, Dy, Lu and Yb using instrumental neutron activation analysis. Thirty surface samples were collected from ten sites in the coastal marine sediments of the South China Sea along 957 km stretch of the east coast of Peninsular Malaysia. The samples prepared in the powdered form before irradiating them in a neutron flux of ∼4 × 1012 n cm-2 s-1 at 750 kW power using the TRIGA Mark II research reactor at Malaysian Institute for Nuclear Technology (MINT). Results of the total concentration are used to establish baseline data in environmental pollution assessment and to develop the correlations between the Ce/Ce*anomalies and the distribution patterns of some the light rare earth elements (LREEs) and the heavy rare earth elements (HREEs). The Chondrite-normalized REE pattern from each site examined and used to explain the sedimentation patterns by anthropogenic activities and by natural processes such as shoreline erosion, weathering deposits. Shale-normalized (NASC) patterns suggest enrichment of LREEs relative to the HREEs with a positive Ce/Ce*anomaly. Validation of the used method was done using a Soil-7 SRM. © 2009 Akadémiai Kiadó, Budapest, Hungary.

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