Mr. Muhammad Rizwan Profile

Muhammad Rizwan

at PIEAS

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 1 July 2021 Paper

Efficiency calibration of NaI (Tl) detector for disc source using point source experimental technique and Monte Carlo simulations

Azhar Malik, M. Rizwan, Rizwan Ahmed

Proceedings Volume 11877, 118770E (2021) https://doi.org/10.1117/12.2601166

Read Abstract +

The detection efficiency of a gamma ray detector should be calibrated prior to the measurement of activity in samples. The aim of this research is to develop a simple experimental technique to calibrate the efficiency of detectors for geometrical sources by replicating their responses from virtually equivalent sources (VES) constructed from a collection of Standard Point Source (SPS) measurements. Experiments were performed to replicate the response of a disk source of 5.2 cm radius by equivalent disk sources (EDS) reconstructed from a collection of 19, 91 and 169 SPS measurements to optimize the number of measurements, response of detector for radially symmetric SPS locations was verified through Absolute Peak Efficiency (APE) calculations. APE was calculated experimentally for the actual disk source and EDS as well as using EGS5 simulations. The difference between experimentally measured and simulated APE for 5.2 cm EDS was observed to be about 7.8 %, 5.2 % and 5.4 % for 137Cs and about -1.3 %, 1.3 % and 2.7 % for 22Na for the EDS constructed from 19, 91- and 169 SPS measurements respectively

Proceedings Article | 1 July 2021 Paper

Estimation of gamma radiation shielding parameters for polymer matrix composites using EGS5 Monte Carlo code

Aurang Zaib, Azhar Malik, M. Rizwan, Bashir Ahmed, G. B. Shah, . Mazullah, M. Nadeem

Proceedings Volume 11877, 118770D (2021) https://doi.org/10.1117/12.2601162

Read Abstract +

Polymer matrix composite (PMCs) materials developed by room temperature vulcanization having various compositions i.e. 0, 30.1, 47.8, 59.8, 68.1 and 88.1 wt. % of tungsten incorporated in silicon rubber matrix were investigated using EGS5 Monte Carlo Code. Narrow beam geometry similar to experimental setup was modeled and validated for Monte Carlo simulation by making a comparison with standard XCOM (NIST) results. Gamma-ray shielding features of all composite materials were studied for several photon energies (122, 511, 662, 837, 1173, 1332 and 1811 keV) and compared with the XCOM and previously reported experimental results. Monte Carlo simulation results were in high accordance with the previous experimental study at gamma ray energy of 662 keV and maximum deviation was observed to be around 10 %. Thus, it can be concluded that this method is suitable for predicting the shielding characteristics of different materials. Additionally, mass attenuation coefficients (μ/ρ), mean free path (MFP), half-value layer (HVL), tenth value layer (TVL) were determined and effective atomic numbers (Z_eff) is calculated using Power law for all PMCs. PMCs with tungsten loading above 68% showed mass attenuation coefficients greater than lead with additional feature of flexibility which makes them promising candidate in radiation shielding. In addition, these silicon/tungsten composites having 68 and 88 % of tungsten are 3.6 and 1.7 times lighter than lead respectively.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years