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在阿尔及利亚西海岸的小海湾加扎韦特采集了不同粒度的海洋表层沉积物样品,并对其进行了研究,以测量α、β和γ放射性。本次研究的目的是探测放射性污染。使用把γ能谱、放射性化学分离和α能谱、β计数相结合的方法,测定了样品中大部分有意义的天然放射性同位素(~(210)Po、~(210)Pb、~(220)Ra等)的活度。天然放射性核素示出相对高的活度。这些样品的分析得出一些人工放射性核素可测量的量,即~(238)Pu(0.02～0.05Bq/kg灰分),~(239+240)Pu(为0.3～0.6Bq/kg灰分),~(137)Cs(6.9～8.5Bq/kg灰分)和~(90)Sr(1.4～7.4Bq/Kg灰分)。所获得的~(238)Pu与~(230+240)Pu及~(137)Cs与~(239+240)Pu的浓度比证明,该人工放射性主要归因于核试验沉降物。
Samples of ocean surface sediments of different particle sizes were collected at Ghazavet, a small cove on the western coast of Algeria, and were studied to measure alpha, beta and gamma radioactivity. The purpose of this study is to detect radioactive contamination. The most significant natural radioactive isotopes (~ (210) Po, ~ (210) Pb, ~ (220)) in the sample were determined by the combination of gamma spectroscopy, radioactive chemical separation and alpha spectroscopy and beta counting. Ra, etc.) activity. Natural radionuclides show relatively high activity. Analyzes of these samples yielded measurable quantities of artificial radionuclides, namely ~ (238) Pu (0.02-0.05 Bq / kg ash), ~ 239 + 240 Pu (0.3-0.6 Bq / kg ash) ~ (137) Cs (6.9 ~ 8.5Bq / kg ash) and ~ (90) Sr (1.4 ~ 7.4Bq / Kg ash). The concentration ratios of ~ (238) Pu to ~ (230 + 240) Pu and ~ (137) Cs to ~ (239 + 240) Pu obtained demonstrate that this artificial radioactivity is mainly due to nuclear test sediment.