Systematic indoor radon and gamma-ray measurements in Slovenian schools.

Abstract:

:During the winter months of 1992/93 and 1993/94, instantaneous indoor radon concentrations and gamma dose rates were measured in 890 schools in Slovenia attended in total by about 280,000 pupils. Under "closed conditions," the room to be surveyed was closed for more than 12 h prior to sampling, the air was sampled into alpha scintillation cells with a volume of 700 cm3, and alpha activity was measured. An arithmetic mean of 168 Bq m(-3) and a geometric mean of 82 Bq m(-3) were obtained. In 67% of schools, indoor radon concentrations were below 100 Bq m(-3), and in 8.7% (77 schools with about 16,000 pupils) they exceeded 400 Bq m(-3), which is the proposed Slovene action level. In the majority of cases, radon concentrations were high due to the geological characteristics of the ground. Approximately 70% of schools with high radon levels were found in the Karst region. Gamma dose rates were measured using a portable scintillation counter. An arithmetic mean of 102 nGy h(-1) and a geometric mean of 95 nGy h(-1) were obtained. No extraordinarily high values were recorded.

journal_name

Health Phys

journal_title

Health physics

authors

Vaupotic J,Sikovec M,Kobal I

doi

10.1097/00004032-200005000-00014

keywords:

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

559-62

issue

5

eissn

0017-9078

issn

1538-5159

journal_volume

78

pub_type

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