在科罗拉多州的一个地点对室外222Rn浓度进行了为期三年的连续测量。

Continuous measurements of outdoor 222Rn concentrations for three years at one location in Colorado.

作者信息

Borak T B, Baynes S A

机构信息

Department of Radiological Health Sciences, Colorado State University, Ft. Collins 80523, USA.

出版信息

Health Phys. 1999 Apr;76(4):418-20. doi: 10.1097/00004032-199904000-00011.

DOI:10.1097/00004032-199904000-00011

PMID:10086604

Abstract

Measurements were made of 222Rn concentrations outdoors in Ft. Collins, Colorado, using a continuously sampling scintillation flask between January 1993 and December 1995. These data were analyzed for hourly, daily, and seasonal variations. The average 222Rn concentration at 1 m above the ground was 18 +/- 10 Bq m(-3) with a geometric mean of 15 Bq m(-3) and a geometric standard deviation of 1.7. Hourly averaged data indicated a diurnal pattern with the outdoor 222Rn concentration reaching a maximum in the early morning between 4:00 a.m. and 6:00 a.m. and a broad minimum between 1:00 p.m. and 4:00 p.m. in the afternoon. An analysis also indicated that the outdoor 222Rn concentrations were consistently lowest during the spring (March and April) and highest during the late summer (July-September).

摘要

1993年1月至1995年12月期间，在科罗拉多州柯林斯堡使用连续采样闪烁瓶对室外的222Rn浓度进行了测量。对这些数据进行了每小时、每日和季节性变化分析。地面上方1米处的平均222Rn浓度为18±10 Bq m(-3)，几何平均值为15 Bq m(-3)，几何标准差为1.7。每小时平均数据显示出一种日变化模式，室外222Rn浓度在凌晨4:00至6:00之间达到最高值，在下午1:00至4:00之间处于广泛的最低值。一项分析还表明，室外222Rn浓度在春季（3月和4月）始终最低，在夏末（7月至9月）最高。