Estimation of radiation hazard indices from natural radioactivity of some rocks

ADVANCED NUCLEAR INSTRUMENTATION AND DETECTION

Estimation of radiation hazard indices from natural radioactivity of some rocks

A. ABBADY，

N.K. AHMED，

A.M. EL-ARABI，

R. MICHEL，

A.H. EL-KAMEL，

A.G.E. ABBADY

Nuclear Science and Techniques

Vol.17, No.2

pp.118-122

Published in print 20 Apr 2006

DOI：10.1016/S1001-8042(06)60023-7

CLC：X125,TL817+.2

39800

Different samples of igneous and metamorphic rocks from Egypt and Germany have been considered to measure γ-ray activity concentrations due to naturally occurring, potentially hazardous radonuclides ²²⁶Ra, ²³²Th and ⁴⁰K. The radiation hazard parameters including radiation equivalent activity, gamma-absorbed dose rate, and external and internal hazard indices have been estimated. The gamma-absorbed dose rates in air of rocks in Egypt range from 4.2 to 128.5 nGy·h^-1 with a mean value of 55.3nGy·h^-1. For igneous and metamorphic rocks from Germany, the values of absorbed dose rates fluctuate from 5.1 to 148.6nGy·h^-1, with a mean value of 60.9nGy·h^-1. Generally, it is found that the radiation hazard indices in common igneous rocks are distinctly higher in acidic than in ultrabasic rocks. The results are discussed and compared with the corresponding published data.

Natural radioactivityRocksHazard indices

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