Determination of Some Heavyweight Aggregate Half Value Layer Thickness Used for Radiation Shielding

Abstract

A radiation dose above the maximum permissible limit is very dangerous for human being. In radiation shielding, absorbent materials' properties must be well known. Heavyweight concrete is the most widely used in the world for this aim. The aggregate component of concrete plays an important role in improving concrete properties and this is effect of shielding properties of concrete. The thickness of any given material where 50% of the incident energy has been attenuated is known as the half-value layer. The half-value layer is expressed in units of distance (mm or cm). Like the attenuation coefficient, it is photon energy dependent. Increase of the penetrating energy of a stream of photons will result in an increase in a material's half-value layer. In this study, half-value layer thickness of concrete containing limonite, siderite and barite at different ratios was investigated; for this purpose measurements have been obtained by a collimated beam of gamma ray from sources 60 Co. The total linear attenuation coefficient (µ), half-value layer thickness is evaluated in this study.

Determination of the Tenth and Half Value Layer Thickness of Concretes with Different Densities

“…3, that the linear attenuation coefficient increases with the increasing density of the concretes and when attenuation coefficient increases, the HVL and TVL values decrease for both gamma energies. These results are supported by other reports [3,4,7,9]. The most common materials used for shielding are ordinary concrete, barite concrete, high-density concrete, steel, and lead [9].…”

“…The TVL and HVL thicknesses are expressed in units of distance (mm or cm). These are photon energy dependent, like the attenuation coefficient [4]. HVL and TVL values are the most frequently used quantitative raw factor for describing the penetrating ability of specific radiations through specific material [5].…”

Usability of Fuzzy Logic Modeling for Prediction of Fresh Properties of Self-Compacting Concrete

“…Nowadays, interdisciplinary studies on concretes have become more and more popular. Joint studies of physicists and civil engineers, to develop concrete for radiation shielding applications, can be given as a very important and specific example [1][2][3]. As a result of the studies performed by civil engineers, many special concrete types have emerged.…”

Investigation of Radiation Shielding Properties of Polypropylene Fiber Reinforced Shotcrete

“…However, despite all of the bad effects of radiation, there are also great benefits especially, in the analysis of some biological problems and in the treatment of cancer. Inasmuch as we can not remove the risk of radiation from our lives, we need to take protective measures to minimize the radiation hazards [3]. Radiation absorbing materials have been an * e-mail: meldaalkan@sdu.edu.tr important issue [4].…”