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

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)602-604
Number of pages3
JournalHealth Physics
Volume80
Issue number6
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Radioactivity
Taiwan
radioactivity
roads
contamination
Contamination
asphalt
road
Gamma Spectrometry
Road construction
pavements
streets
Asphalt pavements
Environmental Monitoring
background level
surveillance
pavement
debris
Debris
Spectrometry

Keywords

  • Th
  • Contamination
  • Exposure, population
  • Spectrometry, gamma

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Science (miscellaneous)
  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Public Health, Environmental and Occupational Health
  • Toxicology
  • Physics and Astronomy (miscellaneous)

Cite this

Chang, W. P., Nabyvanets, Y. B., & Jen, M. H. (2001). Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan. Health Physics, 80(6), 602-604.

Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan. / Chang, Wushou P.; Nabyvanets, Yuriy B.; Jen, Min Hua.

In: Health Physics, Vol. 80, No. 6, 2001, p. 602-604.

Research output: Contribution to journalArticle

Chang, WP, Nabyvanets, YB & Jen, MH 2001, 'Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan', Health Physics, vol. 80, no. 6, pp. 602-604.
Chang, Wushou P. ; Nabyvanets, Yuriy B. ; Jen, Min Hua. / Unusual 232Th and 238U contamination on some road surfaces in Taoyuan, Taiwan. In: Health Physics. 2001 ; Vol. 80, No. 6. pp. 602-604.
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