ASSESSMENT OF THE NATURAL RADIOACTIVITY IN THE BRAZILIAN STATE OF RIO-GRANDE-DO-NORTE

被引：44

作者：

MALANCA, A ^{[1
]}

PESSINA, V ^{[1
]}

DALLARA, G ^{[1
]}

机构：

[1] SETTORE FIS AMBIENTALE, PMP USL 4, I-43100 PARMA, ITALY

来源：

HEALTH PHYSICS | 1993年 / 65卷 / 03期

关键词：

GAMMA-RADIATION; SPECTROMETRY; GAMMA; RADIOACTIVITY; NATURAL; SOIL;

D O I：

10.1097/00004032-199309000-00008

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Fifty-one soil samples were collected to a depth of 30 cm in the central and eastern region of the Brazilian state of Rio Grande do Norte. Concentrations of background radionuclides in soil samples were determined by gamma ray spectrometry with an HPGe detector. The average concentrations of Ra-226, Th-232, and K-40 in the surveyed soils were 29.0 +/- 19.4 Bq kg-1, 46.6 +/- 36.2 Bq kg-1, and 677.8 +/- 434.9 Bq kg-1, respectively. The bedrock of Santana do Matos (Rio Grande do Norte) showed fairly high radioactivity (90 Bq kg-1 of Ra-226, 285.6 Bq kg-1 of Th-232, and 1,414 Bq kg-1 of K-40). Radiological measurements carried out in Santana do Matos with a hand-held scintillometer revealed external gamma radiation ranging from 200-330 nGy h-1 in the downtown area. Higher values were recorded in the surroundings of that town.

引用

页码：298 / 302

页数：5

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