Redzuwan Yahaya

Effect of core deformation on 17B halo nucleus

This study aimed to investigate the two-neutron halo nucleus of 17B using the cluster model. The interaction between the two neutrons and deformed core 15B was treated as a rigid rotor with a deformed Woods-Saxon potential and a spin-orbit interaction. The three-body description of the 17B nucleus was carried out using the Jacobi coordinates method. The three-body system of 17B was described with the hyperspherical harmonic method. The three-body energy-dependent on the deformation of the core was also studied. The binding energy, matter radius of 17B, and deformation of 15B were calculated by normalization and by using experimental data. Comparison of the results with experimental data demonstrated the deformation of the core, especially of the prolate shapes.

Structure of two-neutron halo nuclei, 11Li

The two-neutron halo nucleus 11Li has been investigated in this work. Jacobi coordinates is used to describe the three-body system, using two configurations that are the T-configuration and Y-configuration. The calculations have been calculated based on a cluster model. The 11Li nucleus is considered as three-body system core (9Li)+n+n. The core here has been considered as a deformed core. The calculations confirmed that the core has some deformation and has an oblate shape which in turn has effects on the structure of three-body system.

Radiochemistry course in the undergraduate nuclear science program at Universiti Kebangsaan Malaysia

Universiti Kebangsaan Malaysia offered an undergraduate degree program in Nuclear Science since 1980 and the programme has undergone several modifications due to changes in national policy and priority. The programme covers nuclear sub-disciplines such as nuclear physic, radiobiology, radiochemistry, radiation chemistry and radiation safety. The radiochemistry component consists of radiochemistry, chemistry in nuclear industry, radiochemical analysis laboratory, radiopharmaceutical chemistry subjects and mini research project in radiochemistry.

Radiological risk of building materials using homemade airtight radon chamber

Soil based building materials known to contain various amounts of natural radionuclide mainly 238U and 232Th series and 40K. In general most individuals spend 80% of their time indoors and the natural radioactivity in building materials is a main source of indoor radiation exposure. The internal exposure due to building materials in dwellings and workplaces is mainly caused by the activity concentrations of short lived 222Radon and its progenies which arise from the decay of 226Ra. In this study, the indoor radon concentration emanating from cement brick, red-clay brick, gravel aggregate and Portland cement samples were measured in a homemade airtight radon chamber using continuous radon monitor 1029 model of Sun Nuclear. Radon monitor were left in the chamber for 96 hours with an hour counting time interval. From the result, the indoor radon concentrations for cement brick, red-clay brick, gravel aggregate and Portland cement samples determined were 396 Bq m−3, 192 Bq m−3, 176 Bq m−3 and 28 Bq m−3, respe...

Radiological risk assessment of environmental radon

Measurements of radon gas (222Rn) in the environmental are important to assess indoor air quality and to study the potential risk to human health. Generally known that exposure to radon is considered the second leading cause of lung cancer after smoking. The environmental radon concentration depends on the 226Ra concentration, indoor atmosphere, cracking on rocks and building materials. This study was carried out to determine the indoor radon concentration from selected samples of tin tailings (amang) and building materials in an airtight sealed homemade radon chamber. The radiological risk assessment for radon gas was also calculated based on the annual exposure dose, effective dose equivalent, radon exhalation rates and fatal cancer risk. The continuous radon monitor Sun Nuclear model 1029 was used to measure the radon concentration emanates from selected samples for 96 hours. Five types of tin tailings collected from Kampar, Perak and four samples of building materials commonly used in Malaysia dwellin...