Laith Ahmed Najam
@uomosul.edu.iq
Physics Dept, College of Science
University of Mosul
Prof. Dr. Laith Ahmed Najam
Nuclear Physics and Radiation Physics
Physics Department, Mosul University, Iraq
Full Professor
E-mail: , laith_najam@
Research fields:
Nuclear Physics
Radiation Physics
Semiconductor Radiation Detectors
B.Sc. Physics (1987) Mosul University-IRAQ
85.7% the second in the first in the Physics Dept.
M.Sc. in Nuclear Physics (1990) Mosul
81% the First in the Dept.
M.Sc. Thesis under Title:
((A Study of the decay Scheme and the Nuclear structure of Dy-
160 ))
Ph.D. in Nuclear Physics (2006) Mosul
Ph.D. thesis under Title:
((The Fabrication of Nuclear Detector from Semiconductor Material))
Assistant lecture (1991)
Lecture ((1997))
Assistant Prof. ((2001)
Prof. ((2012))
Subject that has been taught
1) Nuclear Physics for the fourth class
2) Elementary particles for the third class
3) Nuclear reactors as selective subject for Fourth Class
4) Plasma Physics as selective subject for Fourth Class
5) Radioactive contamination as selective subject for Fourth Class
6) General Physics for First Class
7) Medical Physics For Student of Technical Student First Class
8) Radiation Physics For Student of Technical Student Fourth class
9) Advance Nuclear Physics for M.Sc. students
10) Detectors and interaction with radiation for Fourth class
11) Selective Subject (Neutron Physics) for Ph.D. Student
12) Environmental pollution for M.Sc. Students
13) Spectroscopy analysis for Ph.D. Students
EDUCATION
Ph.D. In Nuclear Physics
RESEARCH, TEACHING, or OTHER INTERESTS
Physics and Astronomy, Nuclear and High Energy Physics, Radiation, Atomic and Molecular Physics, and Optics
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Yasir A. Al-Jawwady, Quasy Kh. Al-Dulamey, and Laith Ahmed Najam
University of Baghdad College of Science
The present work aims to detect the effects of gamma ray radiation emitted from Co-60 on several blood parameters (PCV, Hb, WBCs and RBCs) of male chickens. Also, the potential antioxidant impact of grape seeds oil exposed to cold plasma as a protective material to lower the damage caused by gamma ray was tested for a long time and low dose rate. Healthy male chickens were used in this study which had an age range of 2 to 3 months and a weight range of 1.5 to 2 kg. Animals were kept in plastic cages (100 x 400 x 40 cm dimensions) within humidity and temperature preserved at limited values. Four experimental groups were included; the first was the un-exposed control. The second group was administered with a dose of grape seed extract. The third group was exposed to gamma ray radiation only. The fourth group was administered with a dose of grape seed extract and irradiated with gamma waves. Forty male chickens were used in this work as they were parted and administered with the selected doses. The control group was considered as the first group that contained 10 male chicken without being exposed to waves of gamma rays. The next group also contained 10 male chicken irradiated with 5 Gy/lh at interval 7 hour/day for 20 days as second group. Another group contained 10 male chicken and was dealt with oil of grape seed 400 mg/kg wt) with orally administered dose for 20 days as third group. The fourth group contained 10 male chicken irradiated with 5 Gy/h at interval of 7 hour/day for 20 days and dealt with orally administered dose (400 mg/kg wt) of grape seed oil for the same time. Overall groups (2-4), male chicken number became 30 used for 40.60 days at 7 hours per day. The schedule of work was achieved at 5 Gy/h of radiation equivalent dose with different exposure time for (20 and 40,60 days) on male chicken and at period 7 hours daily. The grape seed extract was bought from local market in Mosul City and filters from impure, as we found significant decrease in ratio of blood factors RBCs, WBCs, Hb and PCV with increasing of exposure time. This data changes with adding antioxidant materials as (grape seed oil) were the value of blood factors ratio enhancement by increasing the time of dose of these material compared with control group. The blood factors ratio of male chickens change with exposure time, with significant decrease by increasing exposure time, however, the protective material ( grape seed oil ) reduces the change in ratio % of the some blood factors compared with control group.
Taha Yaseen Wais, Farah Nathim Mohammed Ali, Laith A Najam, Howaide Mansour, and Mostafa Yuness Abdelfatah Mostafa
IOP Publishing
Abstract The effects of the environment on human exposure to radiation from naturally occurring radioactive elements have been investigated around the world. In the group of natural radionuclides under examination, the study’s objective is to ascertain the distribution, potential anthropogenic origins, and activity of the radionuclides 226Ra, 232Th, 40K and their radiological risk parameters in twelve soil samples taken from Rabia town in Nineveh Governorate, North Iraq using NaI (Tl) detector. For the examined region, the activity concentrations of 238U, 232Th, and 40K ranged from 4.79 ± 0.211 to 21.77 ± 0.675 Bq kg−1, 11.21 ± 0.942 to 33.57 ± 2.185 Bq kg−1, and 112.8 ± 32.074 to 312.2 ± 95.463 Bq kg−1, respectively. The estimated radiological hazard parameters for the examined samples included the absorbed dose rate (Dair), annual effective dose equivalent (AED), gamma-ray hazard index (I), and annual gonadal dose equivalent. Furthermore, the current work revealed the distribution of radionuclides and their relationships with the mineralogical composition. Based on obtained results, this soil is safe for the population living in the study area and can be used as a building material or for other human activities without posing any radiological danger.
R.B. Alkhayat, Laith Ahmed Najam, Taha Yaseen Wais, and Howaida Mansour
Inderscience Publishers
Eheb Massoud, Atef El-Taher, Laith Ahmed Najam, and Reda Elsaman
Informa UK Limited
Laith A. Najam, Rana Hesham Mahmmod, and Osama Mohammed Juber Albanna
Springer Science and Business Media LLC
Laith Ahmed Najam, Imad Ahmed, Rabee B. Alkhayat, and Taha Yaseen Wais
Inderscience Publishers
H. Mansour, L. A. Najam, and S. A. Abd El-Azeem
National Research and Innovation Agency
The fundamental goal of the current study is to determine the mean activity concentrations of natural and artificial radionuclides of 226 Ra, 232 Th, 40 K, and 137 Cs using gamma spectrometry for three locations, in Egypt, Saudi Arabia, and Iraq, which are significant and vital countries in the Middle East. The mean absorbed dose rate equals 22.35, 28.96, and 43.34 nGy h -1 for Egypt, Saudi Arabia, and Iraq. The results are consistent with international reports. The dose contribution percentages for investigated locations are 24 %, 30 %, and 46 % for Egypt, Saudi Arabia, and Iraq, respectively. The obtained results were clarified by statistical measurements using one-way ANOVA test to determine the distribution and differences between the averages of the three groups under study, as they may be influenced by geological variations and human intervention. It was found that the Iraq samples followed a symmetrical, standard normal distribution, while samples from Egypt and Saudi Arabia did not. Statistically significant differences were found between the data from the three countries.
Laith Ahmed Najam, Sheamaa T. Al Dbag, Taha Yaseen Wais, and Howaida Mansour
Inderscience Publishers
Firas Mohammed Ali Al-Aljomaily, Laith Ahmad Najam, and Saad Nagi Abood
Informa UK Limited
S.N. Abood, A.A. Al-Rawi, L.A. Najam, and F.M. Al-Jomaily
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
Mixed-symmetry states of 92Zr and 94Mo isotopes are investigated with the use of the collective models, Interacting Boson Model-2 (IBM-2) and Quasiparticle Phonon Model (QPM). The energy spectra and electromagnetic transition rates for these isotopes are calculated. The results of IBM-2 and QPM are compared with available experimental data. We have obtained a satisfactory agreement, and IBM-2 gives a better description. In these isotopes, we observe a few states having a mixed symmetry such as 2+2, 2+3, 3+1, and 1+s. It is found that these isotopes have a vibrational shape corresponding to the U(5) symmetry.
Laith Ahmed Najam, Khalid Abdullah Muhammad, and Farid Majeed Mohammed
Springer Science and Business Media LLC
Taha Yaseen Wais and Laith A. Najam
IOP Publishing
Ten samples were studied from sediments collected from the Tigris River in the city of Mosul, and gamma ray spectroscopy NaI(TI) was used in order to detect and calculate the content of natural radionuclides for all samples collected. The results of the samples analyzed for the specific activity of 226Ra ranged from 6.30±0.319 Bq/kg to 13.73±0.411 Bq/kg with mean of 9.86±0.385 Bq/kg, and for 232Th from 13.39±0.626 Bq/kg to 29.84±0.923 Bq/kg and with mean of 23.05±0.838 Bq/kg, while for 40K, it ranged from 166.83±6.456 Bq/kg to 275.96±7.601 Bq/kg and at mean of 232.91±6.456 Bq/kg. the results of the study were within the range of the recommended global values. Therefore, it can be said that the study area is safe and does not pose a threat to the residents near it. Statistical data such as skewness and kurtosis were calculated, and box plot, were applied in order to assess the distribution of radiological parameters
Abdalsattar Kareem Hashim, Laith Ahmed Najam, and Firas Mohammed Ali Aljomaily
Walter de Gruyter GmbH
Abstract Introduction: The radon isotopes are not as significant as (222Rn) due to the decay of the natural radionuclides (235U), (232Th) and (238U) due to their short half-life, at most. (222Rn) can be classified as among the most harmful radioactive elements in the world. Material and method: In this analysis, the closed-can technique was used with solid-state nuclear track detectors (CR-39). After forty days of closed dosimeter buried in the soil of the garden, and ninety days from the closed position in the air of some dwellings were collected dosimeter and stripped of nuclear detectors impact of closed groups. For 8 hours, CR-39 detectors were chemically etched by (6.25 N) NaOH solution at 70°C and then registered within an optical microscope. Result: The levels of soil radon concentrations ranged from 28.44±0.58 to 479.76±2.43 Bq/m3 with a mean value of 220.33±1.64 Bq/m3, while the concentration of radon in the air of certain dwellings varied from (1.95±0.27 to 46.82±0.75) Bq/m3 with an average value of 21.51±0.54 Bq/m3. In comparison, the annual effective dose attributed to radon in soil ranged from 0.71±0.09 mSv/y to 12.10±0.38 mSv/y with an average value of 5.55±0.261 mSv/y, while the annual effective dose in air differed from (0.04±0.02 mSv/y) to (1.18±0.12 mSv/y) with an average value of (0.60±0.09 mSv/y). Conclusion: Neglecting the effects of other radon sources, the percentage share of the annual effective dose due to radon in soil measured in the air home, ranged from 0.005±0.001 to 0.453±0.074 with an average value of 0.130±0.040. Weak correlation between concentrations of radon in households and soil air. But roughly speaking, one can say that in soil air every 1000 Bq/m3 and 1000 mSv/y contributes around 130 Bq/m3 and 130 mSv/y in indoor air.
D H Al Refaei, L M Al Taan, and L A Najam
IOP Publishing
In this paper, the effect of alpha particles on cadmium selenide thin film properties was invistecated. (CdSe) thin films prepared on glass bases at 50°C and 70°C tempartures, and pH=9 using the chemical bath deposition method. The irradiation was performed on (CdSe) films use the alpha particles source Americium (Am-241) with activity of 50μCi and energy 5.3MeV for a period irradiation of 5 hours. The samples were characterized by using the XRD, FESEM and EDX techniques. The optical measurements have been obtained by using the UV-V spectrophotometer. The results showed that there are effects of alpha particles on the optical and structural properties of the films. It was found that the energy gap increases slightly after the CdSe thin film irradiated, the absorption coefficient (α) is increases with irradiation due to the increase in the energy gap. The structure of the CdSe films has been transformed slightly from the cube structure to the hexagonal structure. The grain size increases with irradiation where the relative density increases clearly. The shape of the CdSe thin film at 70°C is affected by irradiation more over than at 50°C.
Yasir A. Al-Jawwady, Q. Al-Dulamey and L. A. Najam
In this search we found the effect of 0.06.0.1 and 0.4 mGy / h gamma rays as radiation doses for 55 days at h /7 day irradiation in certain physiological cases as the sex ratio of adult rats. Major reductions in the total number of offspring were observed (p ˂0.05). female and male sex ratio when exposed to 0.06-0.4 mGy / h doses when compared to control group. Another argument, the effects of gamma radiation with the above dose levels and with the same mating showed substantial increases (p ˂0.05) in the number of female offspring and their sexual ratio. This rise is directly proportional to the increase in doses. This paper also revealed major differences in the sex ratio of male and female rats. The ratio of female offspring to gamma radiation was greater than the ratio of male offspring to control .The exposure of any source with frequency greater than GHz. and wave length in (10-10 meters) must therefore be avoided during gestations.
L.A. Najam, S.N. Abood, and F.M.A. Al-Jomaily
Ukrainian Journal of Physics National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka)
We analyze a sequence of 194−204Po isotopes, using the Configuration Mixing (CM) Interacting Boson Model 2 (IBM-2). We set the parameters of Hamiltonian using a least-square fit for the known energy levels, electrical transition rates B(E2), and quadruple moments Q(2+1) for the first excited states. We have a good agreement with the experimental values for all the observables tested, and we infer that the feature of the shape coexistence is concealed in the isotopes of Po, just as in the isotopes of Os and Pt.
Firas Aljomaily, Laith Najam, Hala Jasim, and Rana Abdulfattah
Egypts Presidential Specialized Council for Education and Scientific Research
IN this paper, alongside Heisenberg's principle of uncertainty, the De-Broglie wavelength hypothesis was used to conclude at a new understanding of the quantum impedance shown by the proton when interacting with the material. It also extracted the quantum impedance, speed, and frequency of electron (a beta particle with energy below 1MeV). This assumed that the electrons and protons have the same wavelength when interacting with the material at a high- voltage vacuum power supply. These formulas can be considered as one of the important applications in nanotechnology that can be used in the field of radiotherapy. The findings obtained concerning beta particle velocity showed that they are compatible with their established formulations, but with a new method. Furthermore, the Beta particle frequency formula may be viewed as a new version. The use of uncertainty in determining the location and momentum of the proton and the beta particle has also been found to have a significant impact in achieving their quantum impedances. Besides that, the quantum impedance of beta particle was obtained according to the principle of conductivity. The results showed the relevance of equation 8 when evaluating the impedance of the proton. It is attributed to the inclusion of the Mp / Me ratio, in addition to the similarity of the remaining variables with the content of the beta particle's quantum impedance formula. The Die-Broglie wavelength was determined, as opposed to the usual. Results showed that a linear relationship between the velocity of the beta ray and its frequency with the power supply.
Durai Ganesh, G Senthil Kumar, Laith Ahmed Najam, V Raja, M A Neelakantan, and R Ravisankar
Oxford University Press (OUP)
Abstract The aim of this study is to assess the degree of contamination in drinking water sources around the holy mountain “Arunachala” in Tiruvannamalai, Tamil Nadu. Drinking water samples from 20 different sites were collected, and their physio-chemical parameters, pH, electrical conductivity and total dissolved solvents were determined. An LED fluorimeter was used to determine the concentration of uranium in these samples. As consumption of contaminated drinking water involves both carcinogenic and non-carcinogenic risk, excess cancer risk; life-time average daily dose; hazard quotient and annual effective dose were calculated for the samples. On comparing these values with their respective maximum permissible limits, it is found that water from the aquifers around the mountain is safe to consume.
Dhahir Mohammed Dhahir, Hussien Abid Ali Mraity, Ali Abid Abojassim, Laith Najam Najam, and Hashim Yousef Yaqoub Al-kazrajy
Univ. of Malaya
Sinan Mohamed Hasan, Hussain Ali Al-Jobouri, O. A. Jalal, Jamal Abduljabar Hasan, and Laith A. Najam
IOP Publishing
E. Devanesan, A. Chandrasekaran, S. Sivakumar, K. M. Freny Joy, Laith Ahmed Najam, and R. Ravisankar
Springer Science and Business Media LLC
Laith Ahmed Najam, Nada F. Tawfiq, Enas M. Younis, and Ibtisam M. Abdual Aziz
University of Baghdad College of Science
Uranium concentration and the annual committed effective dose in some selected medicinal plants commonly used in Iraq have been determined using fission tracks technique etch in twelve medical plants samples using CR-39 track detector. The results show that the uranium concentration ranged from 0.044±0.021 ppm in Thyme sample to 0.2±0.03 ppm in Black Pepper and Cardamom samples with an average value of 0.14 ±0.0 4ppm. The average annual effective dose due to ingestion of uranium radionuclide was 13.77x10 -5 mSv/y, which is below the world average annual committed effective dose of 0.3 mSv/y for ingestion of natural radionuclides.
Malik H. Kheder, Laith A. Najam, Rana H. Mahmood, and Fouad A. Majeed
Inderscience Publishers
RECENT SCHOLAR PUBLICATIONS
MOST CITED SCHOLAR PUBLICATIONS
Publications
1. Hashim, A.K., Najam, L.A., Ashour, N.I., et al. Uranium Concentration, Effective Radium Content and Radon Exhalation Rate
Estimation for different Tea Brand Samples in Iraqi Market, Plant Archives Vol. 19 No. 1, 2019 pp. 407-412.
2. Abojassim, A.A., Mohammed, H.AU., Najam, L.A. et al. Uranium isotopes concentrations in surface water samples for Al-Manathera and Al-Heerra regions of An-Najaf, Iraq, Environ Earth Sci (2019) 78: 132. .
3. Hashim AK, Najam LA, Mohammed EJ, Hameed AS. Estimation of Radon Exhalation Rate, Radium Activity and Uranium Concentration in Biscuit Samples in Iraq. Iran J Med Phys 2019; 16: 152-157. 10.22038/.
4. Hussain A. Al-Jobouri, Fala H. Taha, Laith Ahmed Najam and Wijdan Thamer Faaz, Determination the Effect of Gamma Radiation on (CR-39, CN-85) Detectors by Using of Penetration of (He-Ne) Laser Beam, Research Journal of Applied Sciences 14 (1): 45-48, 2019.
5. El-Taher A, Najam LA, Hussian I, Omer MAA. Evaluation of Natural Radionuclide content in Nile River Sediments and Excess Lifetime Cancer Risk Associated with Gamma Radiation. Iran J Med Phys 2019; 16: 27-33. 10.22038/.
6. Hussain Ali Al-Jobouri, Wijdan Thamer Faaz, Laith A. Najam, Effect of Ultraviolet Radiation on CN-85 and CR-39 Detectors by UV-Visible Spectroscopy and (He-Ne) Laser Penetration Techniques, Asian Journal of Chemistry, Vol. 30, No. 9 (2018), 2075-2078, DOI: 10.14233/.
7. Laith A. Najam, Sameera A. Ebrahiem, Shaemaa A. Abbas Hind A. Mahdi, Assessment of Radon Gas Concentrations Levels and Radiation Hazards in the Dwellings of Baghdad Province, Iraq, Rasayan J. Chem., 2018, 11 (1), 37-40, DOI: 10.7324/.
8. Atef El-Taher, Laith Ahmed Najam, Afrah Hassoon Oraibi, Matthew Omoniyi Isinkaye, Effect of Cement Factory Exhaust on Radiological Contents of Surrounding Soil Samples in Assuit Province, Egypt, Journal of Physical Science, 2017, 28 (3), 137–150, DOI: 10.21315/.
9. Liath Ahmed Najam, Taghreed Khalid Hameed, Ahmed Obeed Farhan, Assessment of Radon Gad Concentrations Levels and Hazards Indices in Houses of Wassit Province-Iraq, Rasayan J. Chem., 2017, 10 (4), 1311-1315, DOI: 10.7324/.
10. Liath Ahmed Najam, Hazim Louis Mansour, Nada Fadhil Tawfiq, Mahmood Salim Karim, Measurement of Radon Gas Concentrations in Tap Water Samples for Thi-Qar Governorate Using Nuclear Track Detector (CR-39), Detection, 2016, 4, 1-8, 10.4236/.
11. Laith Ahmed Najam, Hazim Louis Mansour, Nada Fathil Tawfiq and Mahmood Salim Karim, Measurement of Radioactivity in Soil Samples for Selected Regions in Thi-Qar Governorate-Iraq, Journal of Radiation and Nuclear Applications, 2016, 1, 25-30.
12. Muataz A. Majeed, Ghasan Adnan Naeem, Laith Ahmed Najam, Attenuation of X-ray Fluorescence by Cadmium Compounds (CdSO4, CdCl2, CdO), International Journal of Advanced Research in Physical Science (IJARPS), Volume 3, Issue 8, 2016, PP 1-4.
13. Laith Ahmed Najam, Mahmood Salim Karim, Taghreed Khalid Hameed, Measurement of Radon Gas Concentration in Tap Water Samples in Wassit Governorate by Using Nuclear Track Detector (CR-39), International Journal of Physics, 2016, 4 (5), 119-122, DOI: 10.12691/ijp-4-5-1.
14. Ruqaya Jabir Hadi, Ali Abid Abojassim, Laith Najam, Radial Atomic Properties of Excited States for Beryllium Atom (1s2 2s ns) (1s), American Journal of Modern Energy, 2016, 2(1), 1-4, 10.11648/j..
15. Hussain A. Al-Jobouri, Laith Ahmed Najam, Mustafa Y. Rajab, Image Analysis of Cr-39 and Cn-85 Detector Irradiated by Thermal Neutron, International Journal of Recent Research and Review, Vol. IX, Issue 1, March 2016.
16. Laith Ahmed Najam, Abdalsattar Kareem Hashim, Hussein Abdulkareem Ahmed, Israa M. Hassan, Study the Attenuation Coefficient of Granite to Use It as Shields against Gamma Ray, Detection, 2016, 4, 33-39, 10.4236/.
17. Ammar A. Battawy, Nada F. Tawfiq, Laith Ahmed Najam, Mohamad Suhaimi Jaafar, Iskandar Shahrim Mustafa, Indoor Radon Concentration Measurement in Different Iraqi Radiation Locations, International Journal of Recent Research and Review, Vol. IX, Issue 1, March 2016.
18. Saad Naji Abood, Laith Ahmed Najim, An IBM-2 Calculation of E2/M1 Multipole Mixing Ratios of Transitions in 90-96Sr, International Journal of Physics, 2016, Vol. 4, No. 1, 5-10. DOI: 10.12691/ijp-4-1-2.
19. ABDALSATTAR KAREEM HASHIM, LAITH AHMED NAJAM, RAMLA D. AL-ALAWY, Effective Radium Content and Radon Flux Determination in Cereals and Legumes Iraqian Products, Estratto da: Atti della Fondazione Giorgio Ronchi, Anno LXX, n. 6 - 11-12, 2015, http ://.