Mohamad Suhaimi Jaafar

• PhD
• Professor at University of Science Malaysia

Mass attenuation coefficients of fly-ash based geopolymers fabricated with different proportions of barite are measured using a high-resolution NaI spectrometer detector. After fabrication, the samples were irradiated with gamma-rays emitted from point sources of 241Am and 137Cs. The measured experimental values are found to be consistent with theo...

Introduction: Glass phosphors are broadly used to determine patient doses in radiation diagnostic and radiotherapy because of their good features, the dose ranges of interest are approximately0.1 -100 mGy for clinical x-ray diagnostics, and 1-5Gy for radiotherapy. Materials and Methods: Borate silica glass samples were prepared using melt quenching...

Concentrations of Radon-222, Lead (Pb), Chromium (Cr), Cadmium (Cd), Cobalt (Co), Zinc (Zn), and Copper (Cu) have been estimated in agricultural soil in the Seberang Perai, Malaysia. The activity concentration of radionuclides was determined using plastic track detectors (CR-39) to measure the exhalation radon rate in the virgin and fertilizers soi...

Laser cleaning has been identified as an ideal technology to replace conventional chemical techniques in the motorcar coating removal process to maintain the sustainability of our environment. This is due to the unique characteristics of this cleaning technique, such as being versatile, precise, controllable, lack of waste generation, and environme...

The glass phosphor thermoluminescence (TL) properties of zinc borate silica (ZBS:45ZnO-45B2O3–10SiO2) doped with various concentrations of Cu2O and then co-doped with various SnO2 was analyzed. The doped sample with 0.005% Cu2O concentration and co-doped with 0.1 mol% SnO2 have a higher TL response among the other concentrations for a delivered dos...

Background: The presence of heavy metals and radon in water are considered as a potential threat to public health. Modern day industrialization has led to increase pollutants in ecosystem whilst the main source of public radiation exposure, especially exposure from radon, is caused by portable water. This study aimed to estimate the health risk rel...

Abstract:Some researchers formerly provided the mechanical, physical, and attenuation properties of the fabricatedEremurus–Rhizophoraspp. particleboard phantom. In this study, the percentage depth dose (PDD) and the half value layer(HVL) of fabricatedEremurus–Rhizophoraspp. particleboard phantom were determined and compared with those ofPerspex and...

Some researchers formerly provided the mechanical, physical, and attenuation properties of the fabricated Eremurus–Rhizophora spp. particleboard phantom. In this study, the percentage depth dose (PDD) and the half value layer (HVL) of fabricated Eremurus–Rhizophora spp. particleboard phantom were determined and compared with those of Perspex and wa...

The study of the effects of low-level laser (LLL) radiation on blood is important for elucidating the mechanisms behind the interaction of LLL radiation and biologic tissues. Different therapy methods that involve blood irradiation have been developed and used for clinical purposes with beneficial effects. The aim of this study was to compare the e...

Background: Advances of nanotechnology have led to the development of nanomaterials with both potential diagnostic and therapeutic applications. Among them, super paramagnetic iron oxide nanopaterials (SPIONs) have received particular attention. Modified EDC coupling fraction used to fabricate the SPION-C595 as an MR imaging contrast agent for brea...

This study aims to reduce backscattered radiation inside an X-ray room during X-ray imaging. A number of anti-scatter grids with different geometrical designs have been fabricated from iron steel and aluminium independently because of their relatively better abilities to reduce backscattered radiation compared to other materials, to elucidate the b...

Magnetic resonance (MR) imaging plays an essential role in molecular imaging by delivering the contrast agent into targeted cancer cells. The aim of this study was to evaluate the C595 monoclonal antibody-conjugated superparamagnetic iron oxide nanoparticles (SPIONs-C595) for the detection of breast cancer cell (MCF-7). Methods: The conjugation of...

Background: Magnetic resonance imaging (MRI) plays an essential role in molecular imaging by delivering the contrast agent into targeted cancer cells. The aim of this study was to evaluate the C595 monoclonal antibody-conjugated superparamagnetic iron oxide nanoparticles (SPIONs-C595) for the detection of breast cancer cell (MCF-7). Methods: The...

Following the advances in pH sensors based on porous silicon (p-Si) in the late 20th century, several studies have been carried out to take advantage of the intrinsic properties of p-Si for development of chemical sensors. This study investigates the characteristics and pH sensitivity of an extended-gate field-effect transistor (EGFET) based on n-t...

In the present study, the activity concentrations of 226Ra, 232Th and 40K in the selected vegetables collected from different locations of Cameron Highlands, Pahang, Malaysia were determined using high purity germanium detector (HPGe). The average activity concentration of 226Ra, 232Th and 40K in vegetable samples were found as 6.05 ±1.57,4.91±1.4...

The thermoluminescence properties of optimum zinc borate silica ZBS glass sample doped with various concentrations of Cu2O were studied. TL response is enhanced by doping ZBS glass samples with different concentrations of Cu2O. The sample with 0.005% Cu2O concentration has a higher TL response among the concentrations for a delivered dose 50 Gy of...

Effective and specific diagnostic imaging techniques are important in early-stage breast cancer treatment. The objective of this study was to develop a specific breast cancer contrast agent for magnetic resonance imaging (MRI). In so doing, superparamagnetic iron oxide nanoparticles (SPIONs) were conjugated to C595 monoclonal antibody using EDC che...

The purpose of this study is to evaluate the level of concentration of radionuclides in Non-cultivated soils and water, which are taken from Seberang Perai in Penang, Malaysia. The concentrations of natural radioactive nuclides; 226 Ra, 232 Th, and 40 K were assessed using HPGe detector. The concentrations of 226 Ra, 232 Th, and 40 K in soil sample...

Laser cleaning is considered better and beneficial technique than conventional chemical cleaning in term of environmental implications. In this research, 54 samples of selected car coated substrates labelled as samples A1 – A18, B19 – B36 and C37 – C54 were irradiated with 1.06 µm Nd:YAG laser consecutively. Particulate matter size 1.0 µm (PM 1.0)...

Low-level laser irradiation (LLLI) has various effects on cultured human lymphocytes in vitro, but little is known about such effects in whole blood. This study investigated whether LLLI affected lymphocyte count in human whole blood in vitro. A total number of 130 blood samples were collected from apparently healthy adult patients through venipunc...

This study aims to fabricate radiation protection shields using fly ash with barium Sulphate. Different thickness of fly ash geopolymer with 15% of barium sulphate was constructed, and different energies of X-ray ranged from 80 kVp - 120 kVp were used to assessment the attenuation ability of Lead and fly ash geopolymer with barium Sulphate shields....

This work was devoted to examining the effects of fly ash geopolymer mixed with 15% Barium Sulphate on radiation attenuation using Gafchramic XR-QA2 film. The fly ash geopolymer with 15% Barium Sulphate made high attenuation at energy of 120 KVp. In this study, the maximum radiation attenuation value of 99.43% was obtained by the design shielding b...

This paper assesses the effect of backscattered radiation on X-ray image contrast by evaluating the effect of backscatter reduction on X-ray image contrast. Contrast test tool RMI Densitometer, and different types of fabricated anti backscattered grids have been utilized in this study. The measurements are recorded at different exposure parameters...

This study is presented the effects of alpha deposition into the women blood samples, most of WBC, RBC and PLT counted by used automatic CBC machine before and after irradiation with radium source. The values showed statistical significance for WBC and PLT based on the mean of their differences before and after irradiation which decreased with incr...

Lasers have been widely used in the dental field to treat a number of applications in dentistry. The main objective of this study is to analyse the modification of tooth composition following the Er,Cr:YSGG laser procedure. In this study, human premolar teeth were collected and prepared. The samples were sectioned and molded. 3M Unitek Transbond™ P...

This study was carried out to determine the concentration of 222Rn, 226Ra, and 238U in 25 different toothpastes available in the local market in Penang, Malaysia, using a CR-39 detector. The results showed the maximum concentration of radon/ radium/uranium to be 4197.644 Bq.m−3, 54.369 Bq.Kgm−1, and 0.044 ppm in Colgate4; the annual effective dose...

This study was carried out to analyze the impact of four skin models and three skin characteristics on Monte Carlo simulation of light-skin diffuse reflectance spectra. The simulation was performed using graphic processing unit (GPU)-based Monte Carlo code (CUDAMCML). The computation platform was a laptop with 2.3 GHz processor (Intel Core i5-2410M...

This study is designed to investigate in vitro low-level laser (LLL) effects on rheological parameter, erythrocyte sedimentation rate (ESR), of human blood. The interaction mechanism between LLL radiation and blood is unclear. Therefore, research addresses the effects of LLL irradiation on human blood and this is essential to understanding how lase...

This paper reports the comparative study of X-ray attenuation using different materials which can be utilized to design anti-backscattered grids and radiation protection shields. The characteristics of X-ray attenuation in several materials, namely, lead, copper, iron steel, and aluminum, are investigated under diverse exposure parameters to measur...

Thirty six rectangular shapes of two types national car coated substrate samples were irradiated by using Nd: YAG laser for paint removal. The best and worst crater depth of highest laser paint removal efficiency was selected for surface morphology analysis by using Nova NanoSEM 450. The results show the surface texture of the crater depth was chan...

Curcumin is more soluble in ethanol, dimethylsulfoxide, methanol and acetone than in water. In this study, nanocurcumin combined with 8 mT AC static magnetic field was used to enhance cellular uptake, bioavailability, and ultimate efficiency of curcumin against prostate cancer cell line (PC3), four bacteria strains (two Gram positive: Micrococcus l...

Objective: This study was conducted to investigate the effects of low-level laser (LLL) doses on human red blood cell volume. The effects of exposure to a diode pump solid state (DPSS) (λ = 405 nm) laser were observed. Background data: The response of human blood to LLL irradiation gives important information about the mechanism of interaction o...

In this work, the outdoor radon concentration level and lung cancer risks have been measured in different Iraqi radiation locations during the summer season 2012 by using time integrated passive radon dosimeters containing LR-115 Type II plastic track detectors. These measurements were carried out in the locations for an exposure time of 60 day. Th...

Laser coating removal is an approach that has the potential to replace conventional chemical-based stripping methods in industry. In addition to the laser parameters, the efficiency of this cleaning technique depends also on the coating system itself. For this reason, we study the influence of the elemental compositions of two Malaysian automotive...

The study of human blood by laser is beneficial because of its availability, and physiological importance. This study is conducted to investigate the effects of low level laser (LLL) doses on human red blood cells. The effects of exposure to yellow low level laser (X = 589 nm) on human blood are observed. A 10 mW laser was used for irradiation with...

Background Curcumin (diferuloylmethane) is a polyphenol derived from the plant Curcuma longa, commonly called turmeric. Extensive research over the last 50 years has demonstrated that these polyphenols play an important role in the maintenance of health and prevention of diseases, in addition to its therapeutic benefits such as anti-tumor, anti-inf...

This study investigated the effect of 460 nm and 532 nm laser irradiation on anaemic blood compared with normal samples at different exposure times. Blood smears were prepared to study the effect of laser irradiation on erythrocyte deformability. Irradiation of normal and anaemic blood samples with 460 and 532 nm laser light significantly changed e...

A technique to determine the optimum parameters of 30 Watt Continuous Wave (CW) CO2 laser paint removal has been developed on national car coated substrate. This paper reports on the results of studies carried out on two different coating thicknesses; 196 μm and 201 μm using CW CO2 lasers operating at 10, 600 nm wavelength and relatively high beam...

The current study aims to build a mathematical model in order to assist the researchers to calculate the uranium concentrations in urine samples for labors in factories whom spend several years of work. So a new mathematical model is constructed by several parameters. The proposed mathematical model covers samples for labors who are working in many...

This study aims to investigate a way to reduce transmitted x-ray through cement shielding. A cement shielding which painted by Barium Sulfate capable of absorbing a significant portion of X-ray was used with different thickness and composition. The measurements were recorded at various applied voltages (50 kVp to 120 kVp), and the transmitted and b...

This study aims to investigate a way to reduce transmitted x-ray through cement shielding. A cement shielding which painted by Barium Sulfate capable of absorbing a significant portion of X-ray was used with different thickness and composition. The measurements were recorded at various applied voltages (50 kVp to 120 kVp), and the transmitted and b...

In our work, we have used mathematical modeling to determine the uranium concentrations in the urine samples of workers in radiation field according to the number of working years. The work aims at constructing a mathematical model to determine the uranium concentrations in the urine of the radiation workers based on the number of working years. Th...

Three light foamed concrete (LFC) have been produced using different cement to aggregate ratios to determine the factors that influenced the production of 222Rn gas from fabricated building materials. The brick was put into a closed perspex box and the net 222Rn concentration levels were measured for 5 consecutive days. The results showed that LFC...

The radon activity concentration and toxic elements have been assessed in drinking and irrigated water samples collected from different locations of Sungai Petani, Kedah, Malaysia. The water samples were collected from wells, streams and taps. A calibrated alpha spectrometer RAD-7 (Model 2890) and Atomic Absorption Spectrometers (Perkin–Elmer, Mode...

Radioactivity distribution and transfer factor (TF) in plants are crucial parameters used to assess radioactive contamination in the environment and its risks to humans. In this study, the activities of 226Ra, 232Th, and 40K were successfully measured via gamma-ray spectrometry on rice plant components (root, straw, husk, and grain) and on correspo...

A new series of doped rare earth element erbium oxide (Er2O3)-based zinc borate silica glasses was prepared. These compounds exhibited the chemical formula [(X Er2O3)(50–X)% ZnO)][(20%B2O3)(30%SiO2)], where X = 0.5%, 1%, 2%, 3%, 4%, and 5% mol%. The SiO2 used was obtained from a rice husk. The glass samples were subjected to different measurements...

The technique of nuclear fission track analysis with solid state nuclear track detectors CR-39 has been applied to determine concentrations of uranium in cancerous samples of human tissues that excised from patients in the three key southern Iraqi governorates namely, Basrah, Dhi-Qar, and Muthanna. These provinces were the sites of intensive milita...

The effect of Nd: YAG laser pulses with a wavelength of 1064nm and 3mm of beam diameter on dental tissue enamel contains an adhesive material (transbond plus self-etching primer) is studied. Laser provides an ability to accurately deliver a large amount of energy into a confined regions. Additionally, Field Emission Scanning Microscopy (FESEM) and...

The effect of Nd: YAG laser pulses with a wavelength of 1064nm and 3mm of beam diameter on dental tissue enamel contains an adhesive material (transbond plus self-etching primer) is studied. Laser provides an ability to accurately deliver a large amount of energy into a confined regions. Additionally, Field Emission Scanning Microscopy (FESEM) and...

A study on natural radioactivity in virgin and agricultural soil samples collected from Sungai Petani was conducted using high-purity germanium. The mean activity concentrations of 226 Ra, 232 Th, and 40 K in virgin soils were 51.06±5.83, 78.44±6.42, and 125.66±7.26 Bq kg −1 , respectively, while those in agricultural soils were 80.63±5.78, 116.87±...

Abstract Background: The assay of biological samples is the preferred method for monitoring the internal exposure of toxicological contaminants in human body. Objective: The objective of this study was to determine the concentrations of Pb, Ni and Cd in biological samples of Southern Iraqi cancer patients. Urine and soft tissue samples were taken f...

Radon and its daughters are the second most important cause of lung cancer after smoking in many countries. It is estimated to range from 3% to 14% of all lung cancers; depending on the average radon level in the area.The radon from water contributes to the total inhalation risk and associated in some areas of Iraq. The aim of this research is to m...

A study on natural radioactivity in virgin and agricultural soil samples collected from Sungai Petani was conducted using high-purity germanium. The mean activity concentrations of 226 Ra, 232 Th, and 40 K in virgin soils were 51.06±5.83, 78.44±6.42, and 125.66±7.26 Bq kg −1 , respectively, while those in agricultural soils were 80.63±5.78, 116.87±...

Humans are always exposed during their lives to ionizing radiation arising outside and within the earth. The exposure to these radiation occurs from natural sources such as radioactive elements in rocks and soil, internal exposure form radioactive elements through water, food and air and cosmic rays entering from outer space to earth's atmosphere....

This study aimed to investigate the influenced of F T , α and γ in laser paint removal mechanisms over three types of car coated substrates irradiated by Cynosure Cynergy Pulse Nd:YAG laser. Depth of coating removed (d) versus laser Fluence (F) graphs were plotted for each Pulse Width (PW), Repetition Rate (RR) and Beam Size (BS) considered by meas...

This study aimed to investigate the influenced of F T , α and γ in laser paint removal mechanisms over three types of car coated substrates irradiated by Cynosure Cynergy Pulse Nd:YAG laser. Depth of coating removed (d) versus laser Fluence (F) graphs were plotted for each Pulse Width (PW), Repetition Rate (RR) and Beam Size (BS) considered by meas...

This study aimed to investigate the influenced of F T , α and γ in laser paint removal mechanisms over three types of car coated substrates irradiated by Cynosure Cynergy Pulse Nd:YAG laser. Depth of coating removed (d) versus laser Fluence (F) graphs were plotted for each Pulse Width (PW), Repetition Rate (RR) and Beam Size (BS) considered by meas...

In the last decade, the radon issue has become one of the major problems of radiation protection. Radon exposure occurs when using water for showering, washing dishes, cooking and drinking water. RAD7 and Rad H 2 0 accessories were used in order to measure radon concentration in water sample. In this study, four types of water were concerns which a...

The roots of Eremurus spp. were used as a bio-adhesive in the fabrication of Rhizophora spp. particleboards. The mass attenuation coefficients of Eremurus–Rhizophora spp. particleboard of six samples with two different weight percentages of the Eremurus spp. root (6% and 12%) and three various Rhizophora spp. particle sizes (≤149 µm, 149–500 µm and...

Introduction: To improve laser hair removal (LHR) for dark skin, the fluence rate reaching the hair follicle in LHR is important. This paper presents the results of a comparative study examining the function of wavelength on dark skin types using 755 nm alexandrite and 810 nm diode lasers. Methods: The structure of the skin was created using a rea...

A b s t r a c t Health implications to the staff incharged was studied by measuring mass density (N) of two types of particulate matter (PM 1.0 and PM 10.0) concentration produced during laser paint removal process over three different types of car coated substrate samples A, B and C. The lowest PM 1.0 and PM 10.0 concentrations detected for those...

This study investigated the effect of DPSS green laser on normal anaemic red blood cells at different exposure times The results show that green laser light has different optimum time in affected normal and anemic blood samples. It requires short exposure time to affect anaemic blood samples compared to normal blood samples.

Radon and toxic elements (Pb, Cd, Co, Cu, Cr, Zn and Ni) were measured in different water samples in Cameron Highlands, Pahang. RAD7 and rad H20 were used to estimate the radon concentration. The average values for radon concentration were found to vary from a minimum of 0.21 Bq/L to a maximum of 0.297 Bq/L. Heavy metals concentration were measured...

In this study, some characteristics of Rhizophora spp. particleboards bonded with Serishoom (traditional animal–based adhesive) as a phantom material was investigated. The Rhizophora spp. particleboards were fabricated in two Serishoom adhesive treatment levels (6% and 12%) with three Rhizophora spp. particle sizes (≤ 149 µm, 149 µm – 500 µm, and 5...

The calibration factor of 0.029 ± 0.0002 track cm−2 per Bq d m−3 for radon concentration measurements was determined using CR-39 and RAD7 detectors. The 222Rn concentration varied from 2,225 to 9,950 and 12 to 1,002 Bq m−3 in soil and water, respectively. The highest radon exhalation and gamma dose rates were found in Acid and undifferentiated gran...

a m.kai5757@gmail.com, b msj@usm.my, c arazhar@usm.my, d syah_vw@yahoo.com Abstract: Threshold fluence (F T), absorption coefficient (α) and thermal loading (γ) were estimated on three types of car coated substrate by applying Beer-Lambert law. Cynosure Cynergy Pulse Nd:YAG was using to irradiate 54 substrate samples and the depth of coating remove...

a m.kai5757@gmail.com, b msj@usm.my, c arazhar@usm.my, d syah_vw@yahoo.com Abstract: Threshold fluence (F T), absorption coefficient (α) and thermal loading (γ) were estimated on three types of car coated substrate by applying Beer-Lambert law. Cynosure Cynergy Pulse Nd:YAG was using to irradiate 54 substrate samples and the depth of coating remove...

In this study, the green animal-based, which has been prepared by prolonged boiling of the inedible connective tissues of domesticated ungulates, was investigated for adhesive properties. The viscosity of green animal-based wood adhesive was measured and compared with that of urea-formaldehyde (UF) and phenol-formaldehyde (PF) which are widely used...

Blood samples were acquired from 60 women aged 20-44 years having decreased fertility, infertile or with uterine tumors in the Iraqi Kurdistan region. The concentrations of alpha emitters in fresh blood ranged from 0.0029 to 0.0088 ppm, whereas those in powdered blood ranged from 0.0036 ppm in Eiskan to 0.0096 ppm in Halabjay-Kon in Sulaymania. The...

The objective of this study is to evaluate the mechanical and physical properties of the particleboard manufactured from Rhizophora spp. in three particle sizes bonded with powdered Eremurus spp. root as a bio-based adhesive in two adhesive treatment levels. The samples acquired high internal bond strength values when the Rhizphora spp. particle si...

Cynosure Cynergy Pulse Nd:YAG laser was used to remove the painted material of 54 car coated substrate samples A, B and C by manipulating the laser fluence energy (F), pulse width (PW), repetition rate (RR) and beam size (BS). Alicona IFM G4 was used to analyze irradiated crater depths and obtained the optical surface micrograph which provides a pa...