Radiation Measurements Research Papers - Academia.edu (original) (raw)

The dimension stones sector in Brazil produces several varieties of granites, marbles, slates and basalts. More than half of this production corresponds to around 200 different commercial types of granites with specific names,... more

The dimension stones sector in Brazil produces several varieties of granites, marbles, slates and basalts. More than half of this production corresponds to around 200 different commercial types of granites with specific names, geographical and geological origins and mineral compositions. The well-known natural radioactivity present in rocks, where high radiation levels are associated with igneous rocks such as granite, can

We are reporting the results of an investigation designed to determine the magnitude of the light induced fading associated with the OSL response of Al2O3:C. Unlike previous studies where bare, radiation sensitive OSL elements were... more

We are reporting the results of an investigation designed to determine the magnitude of the light induced fading associated with the OSL response of Al2O3:C. Unlike previous studies where bare, radiation sensitive OSL elements were exposed directly to light, most of the experiments described here were conducted using sealed commercially available OSL dosimeters. During light exposure the OSL sensitive elements were kept inside a standard commercially available plastic badge. A commercial OSL system was used for these experiments in an attempt to simulate typical field use conditions. Both light induced signal and light induced fading were considered, however no measurable light induced signal could be identified. Light induced fading effects, however, were significant, up to 55% loss of OSL signal following daylight exposure of 45 days. The possibility that dose information may be easily erased, intentionally or accidentally, could impose significant restrictions on the ability of the US Navy to defend, if needed, the reported personnel dose levels.

Efficiency of energy storage is one of the most important questions in the investigation and the characterization of the thermoluminescent (TL) materials. The selection of the activator, its concentration, the structure of the host... more

Efficiency of energy storage is one of the most important questions in the investigation and the characterization of the thermoluminescent (TL) materials. The selection of the activator, its concentration, the structure of the host material will all influence the TL properties. The present paper reports on relative efficiency measurements of charge trapping in newly synthesized lithium-tetraborate based phosphors (Li2B4O7:Mn, Li2B4O7:Ag) based on subsequent measurements of radioluminescence and thermoluminescence in a specially designed TL reader.

Aims: Understanding the knowledge gaps among the public regarding radiation protection of each modality has helped to assess the community awareness and perception, which reflects our urgent need for more education for the public. This... more

Aims: Understanding the knowledge gaps among the public regarding radiation protection of each modality has helped to assess the community awareness and perception, which reflects our urgent need for more education for the public. This project aims to evaluate the knowledge levels of patients undergoing medical imaging procedures is regarding the risk and benefits by providing sufficient information regarding their specific medical imaging technique upon examination. Study Design: A prospective study with a special questionnaire to collect data. Place and Duration of Study: Subjects: Different departments of Radiology in different hospitals, Jeddah, Saudi Arabia, for 3 months. Methodology: The survey was conducted in Jeddah, Saudi Arabia, to include four major hospitals. The sample of the study included 500 patients (125 for each hospital). Patients are aged 18 years and over were referred by physicians for a radiological examination, including different radiologic modalities. Results: It was found that 52% of patients were provided the information about radiology examination. The mean scores of questions ranged from 69% to 76%. So, there was a strong positive correlation between the radiology examination information received by patients and the radiation questions' score.

Methods of luminescence induced by radiation, including thermoluminescence and optically stimulated luminescence, have been widely used for the determination of accumulated dose in crystals for retrospective dosimetry and archaeological... more

Methods of luminescence induced by radiation, including thermoluminescence and optically stimulated luminescence, have been widely used for the determination of accumulated dose in crystals for retrospective dosimetry and archaeological dating. The determination of the radiation dose begins with the extraction of quartz from the sample studied. The methodology commonly applies acids, such as HCl and HF, to remove other compounds present in the natural samples. In this work, the effectiveness of this method is questioned, and an alternative method for the extraction of quartz is proposed.

Building materials contain natural radionuclides (238U, 232Th and 40K) and therefore cause direct radiation exposure to the public. The radioactivity content of samples obtained from building materials produced in Elazig city, East... more

Building materials contain natural radionuclides (238U, 232Th and 40K) and therefore cause direct radiation exposure to the public. The radioactivity content of samples obtained from building materials produced in Elazig city, East Anatolian of Turkey, have been analyzed by gamma-ray spectrometry. However, radium equivalent activities, total and annual effective dose rate and external (gamma), internal (alpha) hazard indexes were calculated and radon concentration, radon specific exhalation rate and effective radium content were measured. Also, indoor radon measurements carried out in each floor (uninhabited) of rough construction (newly construction). The specific concentrations of 238U, 232Th and 40K, from selected building materials, ranged from 3.5 to 114.1 Bq/kg, 1.6–20.7 Bq/kg and 201.4–4928.0 Bq/kg, respectively. The lowest of Raeq is 36.5 ± 1.8 Bq/kg calculated in bricks while the highest value is 405.2 ± 20.9 Bq/kg in gas concrete. The average indoor radon concentration is 364.3 Bqm−3, which is higher than the global mean value, in newly constructed floor.