Natural Radioactivity

Eisenbud, Merril

doi:10.1016/b978-012235154-9/50010-4

Cited by 170 publications

(145 citation statements)

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“…The measured activity concentrations were compared with the average activity concentration of 40 K, 228 Ac ( 232 Th) and 226 Ra ( 238 U) for similar types of rocks reported in the world specialist literature. The average value of the activity concentrations of 40 K for granites and gneisses equals 1000 Bq•kg −1 (Van Schmus 1995, Eisenbud & Gesell 1997, which means that the measured value of granite in the Sławniowice quarry is significantly higher than the average one, whereas the activity concentration of paragneiss is almost two times lower than the average value of similar types of rocks. The activity concentrations of 228 Ac ( 232 Th) and 226 Ra ( 238 U) in measured rocks are comparable to the average values (70 Bq•kg −1 and 40 Bq•kg −1 respectively (Van Schmus 1995, Eisenbud & Gesell 1997.…”

mentioning

confidence: 81%

Laboratory measurements of natural radioactivity in selected igneous rocks of the Opava Mountains region

Dżaluk¹,

Malczewski²,

Żaba³

et al. 2015

geol

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mentioning

confidence: 81%

Laboratory measurements of natural radioactivity in selected igneous rocks of the Opava Mountains region

Dżaluk¹,

Malczewski²,

Żaba³

et al. 2015

geol

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“…The radon (radon, for simplicity, hereafter, means the isotope of 222 Rn) is a noble gas following the 226 Ra decay in the 238 U series. As a noble gas, radon does not interact with other elements and can easily emanate from the soil or rocks and concentrate indoors [3]. As uranium and radium are present in almost everything, like soil, rocks, water, building materials, etc., radon often is present in the surrounding air.…”

Section: The Radonmentioning

confidence: 99%

Application of a “Sealed Can Technique” and CR-39 detectors for measuring radon emanation from undamaged granitic ornamental building materials

2011

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Abstract. Radon ( 222 Rn) is the most important cause of exposure to mankind due to natural radioactivity. Radon exhalation depends not only on the 226 Ra concentration in the material, but also on other factors such as mineralogy of the region, size and density of grains and porosity of the material. As building materials are one of the major sources of environmental radon, the radiological implications of the use of materials with great content of uranium must be always assessed. In this work, radon exhalation from several undamaged granitic building materials used as ornamental rocks or coating tiles is determined using the "sealed-can technique" and CR-39 solid state nuclear track detectors (SSNTD). Preliminary results for radon concentrations showed values of the same order that literature values, in a range from 99 Bq.m −3 to 1100 Bq m −3 . Further, the methodology will be validated with standard sources of 222 Rn.

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“…Commonly the radioactive sands are conspicuously black in colour, due to accompanying concentrations of heavy, iron-bearing minerals such as ilmenite and magnetite. Monazite sands represent the most radioactive sedimentary deposits at the Earth's surface today, with effective dose rates up to 270 mSv/yr, about 650 times the world average value (Malanca et al, 1995;Eisenbud and Gesell, 1997). They are sufficiently widespread to represent a globally significant source of high-dose irradiation.…”

Section: Radioactive Mineral Sandsmentioning

confidence: 99%

Mineral Radioactivity in Sands as a Mechanism for Fixation of Organic Carbon on the Early Earth

Parnell

2004

Orig Life Evol Biosph

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Abstract. Irradiation of organic molecules by mineral radioactivity is a feasible alternative to cosmic irradiation to precipitate solid organic carbon-rich matter on the early Earth. Radioactive (uranium-and thorium-rich) minerals have been concentrated at the Earth's surface, and accumulated accretionary coatings of carbon due to irradiation, since early Archean times. The organic accretion process could have occurred at the surface or in the sub-surface, and is independent of a terrestrial or extraterrestrial source for the carbon.

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Natural Radioactivity

Cited by 170 publications

References 0 publications

Laboratory measurements of natural radioactivity in selected igneous rocks of the Opava Mountains region

Laboratory measurements of natural radioactivity in selected igneous rocks of the Opava Mountains region

Application of a “Sealed Can Technique” and CR-39 detectors for measuring radon emanation from undamaged granitic ornamental building materials

Mineral Radioactivity in Sands as a Mechanism for Fixation of Organic Carbon on the Early Earth

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