Abstract The powered roof support is mainly used in natural hazard conditions. Natural hazards Polish mining include methane hazards, gas and rock ejections, coal dust explosions, climate water landslides, eruptions, hydrogen sulphide radioactive substances mass tremors. latter has a significant impact on the operation of support. work analyses tremor risks last ten years. study showed an inten...

The splitting of atoms, also known as nuclear fission, produces radiation and radioactivity. Dr Lise Meitner discovered how radioactivity could be produced in 1939. She found that firing a small particle called neutron into another atom cause to released. Radioactive atoms created this way can useful for detecting cancer or checking whether the body’s organs are working properly. When radioacti...

Naturally occurring radioactive materials (NORMS) and fallout 137Cs were estimated in surface soils from the highly mineralized Singhbhum region of Eastern India. The activity concentrations varied from 50.67-109.14 Bq/kg (238U), 48.12142.55 Bq/kg (226Ra), 28.73-89.78 Bq/kg (232Th), 494.84-1121.36 Bq/kg (40K) and 1.8-7.48 Bq/kg (137Cs). Correlation between radionuclides was studied. 232Th/238U ...

Soil samples from the three residential hubs of Chittagong city, Bangladesh were analyzed using gamma spectrometry to estimate radiation hazard due to natural radioactive sources and anthropogenic nuclide (137)Cs. The activity concentration of (226)Ra was found to be in the range 11-25 Bq.kg(-1), (232)Th in the range 38-59 Bq.kg(-1) and (40)K in the range 246-414 Bq.kg(-1). These results were u...

Border monitoring equipment for nuclear and other radioactive materials apply fixed installed, automated “portal monitors” at checkpoints such as road and rail border crossings, airports or seaports, to detect gamma and neutron radiation in order to alert the front line officer about the presence of nuclear and other radioactive materials. Although highly sensitive and reliable systems are avai...

Radiological disasters can takemany forms. While they all share a general hazard—radioactive contamination— it is important for policymakers to understand how radiological incidents differ from each other in order to make more informed decisions about preparedness and response. This brief provides a general overview of 3 different types of radiological disasters: a terrorist nuclear detonation ...

INTRODUCTION The “Hanford Scenario” refers to an acute accidental release of radioactive I from the stack of the Hanford (USA) Purex Chemical Separations Plant that occurred between 2 and 5 of September 1963 (BIOMASS, 1999). From the environmental impact point of view it is a very interesting case study for the evaluation of computational systems that simulate the atmospheric dispersion, deposi...

This study investigates whether non-human biota are protected against harmful effects of ionizing radiation after a possible future release of radioactive matter from a planned repository for spent nuclear fuel. Radiation dose rates to a broad spectrum of organisms were calculated based on data from sampled organisms and modeled activity concentrations. Calculations were performed with the ERIC...

Hyperthyroidism is an excessive concentration of thyroid hormones in tissues caused by increased synthesis of thyroid hormones, excessive release of preformed thyroid hormones, or an endogenous or exogenous extrathyroidal source. The most common causes of an excessive production of thyroid hormones are Graves disease, toxic multinodular goiter, and toxic adenoma. The most common cause of an exc...

Abstract. Due to several radioactive accidents at the Mayak Production Association, a facility for production of weapon plutonium put on line in 1948 in the Southern Urals (Russia), an substantial part of the Southern Urals territory was contaminated by long-lived radionuclides. One of the such accident was the wind resuspension of radionuclides (2⋅10Bq) from the shoreline of Karachai lake used...