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001-es BibID:	BIBFORM044688
Első szerző:	Papp Zoltán (fizikus)
Cím:	Estimate of the dose-increment due to outdoor exposure to gamma rays from uranium progeny deposited on the soil around a coal-fired power plant in Ajka Town, Hungary / Papp Z., Dezső Z.
Dátum:	2003
ISSN:	0017-9078
Megjegyzések:	Brown coal unusually rich in uranium is burnt in acoal-fired power plant that lies inside the confines of a smallindustrial town named Ajka, Hungary, and has been operationalsince 1943. The 238U (226Ra) activity discharged to theatmosphere per unit electrical energy produced was about330?400 GBq (GW y)-1, which is 66?80 times more than thatwas estimated by UNSCEAR (1988) as a characteristic valuefor old type coal-fired power plants [5 GBq (GW y)-1]. Theobjective of this study was the experimentally establishedassessment of the artificial increment in the dose from externalexposure to gamma rays of terrestrial radionuclides outdoors.Soil samples were collected in and near Ajka from 81 locations.The samples were investigated by Ge(Li) gamma spectrometry.Considerably elevated concentrations of uranium and itsprogeny have been measured in most of the samples that werecollected near to the plant. Concentrations of 238U and 226Ra inthe top (0?5 cm depth) layer of undisturbed soil at public areasinside town were 4.7 times higher, on average, than those in theuncontaminated deeper layers. Dose rate in air (air kerma)from external exposure to terrestrial gamma rays outdoors ata height of 1 m and effective doses were estimated from themeasured activity concentrations using some relevant literaturedata. The estimated artificial increment in the dose rate inair was, on average, 32.8, 10.3, and 102.1 nGy h-1 at publicareas, vegetable gardens, and backyards, respectively. Themean artificial increment in the annual per caput effectivedose from external exposure to terrestrial radionuclides outdoorsis 21.8 Sv y-1. The collective dose commitment per unitenergy generated from outdoor exposure to the depositeduranium progeny is about 8.0 ?9.1 person Sv (GW y)-1, whichis 67?76 times more than that evaluated by UNSCEAR (1988)for a typical "old" coal-fired power plant [0.12 person Sv (GW y)-1]. Ajka is a suitable place for studying the dosimetricconsequences of the utilization of coal for energy productionexperimentally.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban external dose soil uranium power plant coal-burning
Megjelenés:	Health Physics. - 84 : 6 (2003), p. 709-717. -
További szerzők:	Dezső Zoltán (1947-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM019348
Első szerző:	Papp Zoltán (fizikus)
Cím:	Estimate of the annual per capita surplus dose due to the elevated indoor exposure to 222Rn progeny caused by the use of slag and spoll of uranium rich coal for building purposes in Ajka town, Hungary / Z. Papp
Dátum:	1998
ISSN:	0017-9078
Megjegyzések:	Ajka is a mining and industrial town in Hungary. Brown coal rich in uranium (300 to 900 Bq kg-1) is mined by the town since 1865. Slag and spoil of the coal were frequently used in the town for building purposes before 1960. Screening measurements of 222Rn progeny in indoor air were performed in 86 Ajka buildings. Elevated 222Rn progeny levels were found in houses that used the above by-products as building materials or foundations. Annual per capita surplus effective doses due to the exposure to elevated 222Rn progeny levels were estimated from the results of the screening measurements. The possibility of estimating the mean of the annual averages of 222Rn or 222Rn progeny concentration for a group of houses from the results of screening measurements is discussed in detail. The estimated annual surplus dose is 0.64 mSv for the population of the whole town and 1.86 mSv for the 7000 occupants of family houses built before 1960.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban radon radon progeny dose assessment contamination, environmental
Megjelenés:	Health Physics. - 74 : 3 (1998), p. 393-397. -
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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