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Dive into the research topics where Aziz Ahmed Qureshi is active.

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Featured researches published by Aziz Ahmed Qureshi.


Journal of Radiation Research and Applied Sciences | 2014

Evaluation of excessive lifetime cancer risk due to natural radioactivity in the rivers sediments of Northern Pakistan

Aziz Ahmed Qureshi; Shahina Tariq; Kamal Ud Din; S. Manzoor; Chiara Calligaris; Abdul Waheed

Abstract Naturally occurring radionuclides 226Ra, 232Th and 40K present in the rivers sediments of Northern Pakistan were measured using HPGe γ-ray spectrometer to evaluate the radiation health hazard indices and excess lifetime cancer risk (ELCR). Average concentrations of 226Ra, 232Th and 40K in the sediments were found to be 50.66±1.29, 70.15±1.45 and 531.70±5.45Bqkg−1 respectively. Radium equivalent activity (190.89Bqkg−1), outdoor external dose (87.47nGyh−1), indoor external dose (165.39nGyh−1), and total average annual effective dose (0.92mSv) were calculated. The hazardindices are higher than the worlds average values. Total excess lifetime cancer risk (ELCR) was found to be 3.21×10−3 which is relatively higher. Numerous cancer deaths are annually reported from the Northern areas of Pakistan, which may be related to high radioactivity in the area.


Health Physics | 2004

Fission Track Estimation Of Uranium Concentrations In Drinking Water From Azad Kashmir, Pakistan

M. Akram; N.U. Khattak; Aziz Ahmed Qureshi; A. Iqbal; Muhammad Tufail; I.E. Qureshi

Abstract— The analysis of uranium in water samples can be very helpful for providing guidelines to the general public regarding necessary remedial measures. A fission-track technique has been applied for the estimation of the uranium concentration in drinking water collected from natural springs of Muzaffarabad and hilly areas of Reshian, Azad Kashmir. The technique involved simultaneous irradiation with thermal neutrons of a sample and a standard in contact with a track detector, and the counting of the fission tracks in the detector from the (n, f) nuclear reaction. Uranium concentrations of the samples were determined by comparing fission-track density with that of a standard of known uranium concentration. Uranium concentration in water samples from the Muzaffarabad and Reshian area varied from 0.03 ± 0.01 &mgr;gL−1 to 6.67 ± 0.14 &mgr;gL−1 with an average of 1.36 ± 0.05 &mgr;gL−1. The observed concentrations of uranium in drinking water were found to be less than the Maximum Acceptable Concentration levels of 9–30 &mgr;gL−1. Thus, the observed values are within safe limits as far as uranium related health hazards are concerned.


Radiation Protection Dosimetry | 2014

Study of natural radioactivity in Mansehra granite, Pakistan: environmental concerns

Aziz Ahmed Qureshi; Ishtiaq A. K. Jadoon; Ali Abbas Wajid; Ahsan Attique; Adil Masood; Muhammad Anees; S. Manzoor; Abdul Waheed; Aneela Tubassam

A part of Mansehra Granite was selected for the assessment of radiological hazards. The average activity concentrations of (226)Ra, (232)Th and (40)K were found to be 27.32, 50.07 and 953.10 Bq kg(-1), respectively. These values are in the median range when compared with the granites around the world. Radiological hazard indices and annual effective doses were estimated. All of these indices were found to be within the criterion limits except outdoor external dose (82.38 nGy h(-1)) and indoor external dose (156.04 nGy h(-1)), which are higher than the worlds average background levels of 51 and 55 nGy h(-1), respectively. These values correspond to an average annual effective dose of 0.867 mSv y(-1), which is less than the criterion limit of 1 mSv y(-1) (ICRP-103). Some localities in the Mansehra city have annual effective dose higher than the limit of 1 mSv y(-1). Overall, the Mansehra Granite does not pose any significant radiological health hazard in the outdoor or indoor.


Environmental Monitoring and Assessment | 2012

Assessment of radiological hazard of NORM in Margalla Hills limestone, Pakistan.

Muhammad Ali; Aziz Ahmed Qureshi; Abdul Waheed; Muzahir Ali Baloch; Hamza Qayyum; Muhammad Tufail; H.A. Khan

Studies on naturally occurring radioactive material (NORM) in the limestone from the Margalla Hills have been carried out by measuring gamma activity and to access its radiological implications if any. For data acquisition, a High-Purity Germanium detector was employed. The activity concentrations of 226Ra, 232Th, and 40K were found to be 14.32u2009±u20090.24, 2.05u2009±u20090.04, and 13.80u2009±u20090.20xa0Bqxa0kg−1, respectively. These values are relatively lower as compared to that in the limestone of other countries and much lower than the values reported for the natural building stones. The average specific activities due to 226Ra were found to be higher when compared with 40K and 232Th. Indices of radium equivalent activity (Raeq), internal hazard (Hin), indoor absorbed gamma dose rate (DR,), and corresponding annual effective dose (Eeff) were also determined for the limestone-made rooms. All of these indices were found to be in the lower ranges. The Margalla Hills limestone does not pose any excessive radiological health hazard as a building material and in industrial uses for a common man.


Journal of Radioanalytical and Nuclear Chemistry | 2012

Geological and radiological studies of the Mount Arafat, Mekkah, Saudi Arabia

Aziz Ahmed Qureshi; A. Sultan; A. Rashid; Muhammad Ali; Abdul Waheed; S. Manzoor; Muzahir Ali Baloch; Matiullah; S. Batool; H.A. Khan

Mount Arafat is a sacred place for Muslims. It has been classified as a granodiorite rock which mainly consists of feldspar and quartz, muscovite, etc. During the Hajj and Umra, Muslims visit this holly place and stay there for some time. In order to study the geology and thermal history as well as to assess the radiological hazards due to the presence of primordial radionuclides, systematic studies using petrographic, fission track dating and γ-spectrometric (HPGe) techniques were carried out. Our study yielded fission track age of 9.13xa0±xa01.05xa0Ma of the Mount Arafat granodiorite. Rifting, magmatism, volcanism and sea floor spreading that resulted in the formation of Red Sea seems may have altered the original age of the Arafat granodiorite under study to 9.13xa0±xa01.05xa0Ma. Measured radioactivity concentrations due to 226Ra, 232Th and 40K were found to be 10.75xa0±xa03.92, 29.21xa0±xa04.34 and 664.49xa0±xa07.45xa0Bqxa0kg−1, respectively. From the measured radioactivity, gamma index (Iγ) and radium equivalent (Raeq) were calculated as 0.402 and 103.23xa0Bqxa0kg−1 whereas outdoor external dose (Dout) and annual effective dose (Eout) were estimated to be 40.30xa0nGyh−1 and 0.045xa0mSvy−1 respectively. All the above mentioned values are well below the recommended limits. The Mount Arafat thus does not pose any radiological health hazard to the general public.


Environmental Earth Sciences | 2015

Structural interpretation and geo-hazard assessment of a locking line: 2005 Kashmir earthquake, western Himalayas

Ishtiaq A. K. Jadoon; Matthias Hinderer; Allah B. Kausar; Aziz Ahmed Qureshi; Mirza S. Baig; Mohammad Basharat; Wolfgang Frisch

AbstractThe 08 October 2005, magnitude (Mw) 06 Kashmir earthquake occurred along the Balakot–Bagh fault (BBF) with about 30° dip toward NE in the internal part of the western Himalayas in north Pakistan. It was accompanied by a ground rupture of about 75xa0km with an average slip of about 5xa0m along the causative fault. The epicenter of the thrust was located at about 19xa0km to the NE of its surface trace in Muzaffarabad with about 11xa0km depth of the hypocenter. The geometry of the fault based on a structural cross section has allowed us to interpret it as a thrust restricted to a roof sequence along a triangle zone across the Hazara–Kashmir syntaxis (HKS). The triangle zone is occupied at depth by a wedge of the Higher Himalayan Sequence (HHS) in the core zone of the HKS. The core–wedge is bounded between the NE-dipping BBF and SE- to SW-dipping thrust stack of the Lesser Himalayan Sequence (LHS) along the northeastern and southwestern limb of the HKS, respectively. Based on surface geology, the overlapping BBF and MBT are interpreted to merge at depth in a roof thrust of Pre-Cambrian (Late Proterozoic) rocks above a duplex which is inferred to have a floor thrust in Early Proterozoic/Archean rocks. The core–wedge is located over a ramp which is connected to the floor thrust in the basement. The BBF is inferred to be active, at least since 1–0.5xa0Ma, with recurrence interval of about 625xa0±xa0125xa0years. This out-of-sequence deformation is represented by linear seismicity, both along emergent and blind thrusts in the system, with likelihood of major events as a result of strain buildup due to slow convergence rates (~7xa0mm/year) in the region. Many towns located along the active fault trace were destroyed or largely damaged due to the earthquake. Major destruction of human dwellings and infrastructure occurred as a consequence of earthquake-triggered landslides, mostly along fault, high river terraces, and road cuts. To minimize future damages in earthquake-prone areas, several mitigation measures are suggested including: (1) avoiding new settlements near the fault trace and landslide susceptible areas, (2) establishment of new township schemes in relatively safer areas with earthquake-sustainable structural designs, and (3) extensive forestation for slope stability, erosion control, and provision of wood for flexible earthquake-resistant structures. The measures are needed for the sustainable development of the region.n


Radiation Protection Dosimetry | 2018

ASSESSMENT OF RADIATION DOSE AND EXCESSIVE LIFE-TIME CANCER RISK FROM THE BUNAIR GRANITE, NORTHERN PAKISTAN

Aziz Ahmed Qureshi; S. Manzoor; H Younis; K H Shah; T Ahmed

Natural radioactivity was measured in Bunair Granite using high purity germanium gamma-ray spectrometer and compared to worlds granites and building materials to access its suitability for the construction purpose. Average gamma-activities of 226Ra, 232Th and 40K were found to be 52.41, 58.41 and 1130.12 Bq kg-1, respectively. The Indoor and outdoor radiation indices including excessive life-time cancer risk (ELCR) were calculated. The average indoor ELCR was estimated as 3.49 × 10-3. The average outdoor ELCR was assessed as 0.46 × 10-3. As a basic building material Bunair Granite should be on low propriety. For flooring, facing the buildings and as Table tops, in kitchens and other utilities it is safe.


Radiation Protection Dosimetry | 2013

Assessment of radiological hazards of Lawrencepur sand, Pakistan using gamma spectrometry

Aziz Ahmed Qureshi; Muhammad Ali; Abdul Waheed; S. Manzoor; Rehan Ul Haq Siddique; H.A. Khan

The Lawrencepur sand had remained refrigerated during a long period of glaciations in the study area. Owing to its derivation from the granitic rocks of the Himalayas and its preservation under glacial environment, the sand grains are still fresh and may contain high level of primordial radioactivity. For that reason, radiological hazards of Lawrencepur sand were assessed using a high-purity germanium gamma spectrometry technique. The average activity concentrations of (226)Ra, (232)Th and (40)K were found to be 15.97±3.05, 27.98±4.89 and 498.20±15.91 Bq kg(-1), respectively. These values are higher than those of the sands of many countries of the world but lower than those of some of the Pakistani, Indian and Egyptian sands. The outdoor and indoor hazard indices and annual effective doses of the Lawrencepur sand are higher than those of some of the sand deposits of European, African and American countries but lower than those of nearby Pakistani and Indian sands. However, the hazard indices and annual effective doses of the Lawrencepur sand are within the safe limits. Overall, the Lawrencepur sand does not pose any radiological health hazard as a building material.


Journal of Radiation Research | 2012

A Study on Natural Radioactivity in Khewra Salt Mines, Pakistan

Muzahir Ali Baloch; Aziz Ahmed Qureshi; Abdul Waheed; Muhammad Ali; Nawab Ali; M. Tufail; Saima Batool; M. Akram; Poonam Iftikhar; Hamza Qayyum; S. Manzoor; H.A. Khan


Radioprotection | 2012

Indoor radon concentration levels, gamma dose rates and impact of geology – A case study in Kotli, State of Azad Jammu and Kashmir, sub-Himalayas, in Pakistan

A. Iqbal; M. Shahid Baig; M. Akram; Aziz Ahmed Qureshi

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S. Manzoor

COMSATS Institute of Information Technology

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Abdul Waheed

COMSATS Institute of Information Technology

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Muhammad Ali

Quaid-i-Azam University

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Muhammad Anees

COMSATS Institute of Information Technology

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Ishtiaq A. K. Jadoon

COMSATS Institute of Information Technology

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A. Iqbal

University of Azad Jammu and Kashmir

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Adil Masood

COMSATS Institute of Information Technology

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Ali Abbas Wajid

COMSATS Institute of Information Technology

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Hamza Qayyum

COMSATS Institute of Information Technology

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