Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan

Wushou P. Chang, Yuriy B. Nabyvanets, Min Hua Jen

研究成果: 雜誌貢獻文章同行評審

2 引文 斯高帕斯(Scopus)


At least eight bustling streets or approximately 3-5% of all the road surface of civilian utility in the downtown area of Taoyuan City, Taiwan, were inadvertently found to contain unusual levels of radioactivity during a routine environmental radiation surveillance in mid-1994. Crushed rock debris and coarse sands separated from the asphalt pavement were identified to be the source of excessive radioactivity. By employing gamma spectrometry, we have measured 232Th activity (via 228Ac) and 238U activity (via 214Bi) in some of the samples to be up to about 4,000 and 1,000 Bq kg-1, respectively. The dose rate on the road surface reached about 1.3 μSv h-1, as compared with the background level of 0.08 μSv h-1 in much of Taiwan. This unusual radioactivity was due to accidental mixing of road construction materials with materials enriched 232Th and 238U.

頁(從 - 到)602-604
期刊Health Physics
出版狀態已發佈 - 2001

ASJC Scopus subject areas

  • 環境科學 (全部)
  • 環境科學(雜項)
  • 環境化學
  • 健康、毒理學和誘變
  • 公共衛生、環境和職業健康
  • 毒理學
  • 物理與天文學(雜項)


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