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文章为南海近海放射性背景值近三年来监测的工作小结。监测海区范围在110°—117°E、20°—24°N之间。监测对象包括海水、海洋生物和沉积物。监测的放射性种类包括总U、总β、~(238)U、~(232)Th、~(226)Ra、~(40)K、~(90)Sr、~(137)Cs、~3H等。其结果:海水中总U为(25.6—40.9)×10~(-3)Bq/l,总β为(55.5—87.5)×10~(-3)Bq/l,~(90)Sr为(2.5—4.7)×10~(-3)Bq/l,~(137)Cs为(2.0—4.4)×10~(-3)Bq/l,~3H为(3.3—8.2)×10~(-1)Bq/l。沉积物中,放射性物质的含量~(238)U为51.2—99.7 Bq/kg_(干),~(232)Th为38.1—62.1 Bq/kg_(干),~(40)K为416.3—876.1 Bq/kg_(干),总β为569.2～921.2 Bq/kg_(干),~(226)Ra为24.3—59.1 Bq/kg_(干),~(137)Cs为1.5—2.4Bq/kg_(干)。马尾藻中~(238)U为21.0—99.2 Bq/kg_(干),~(232)Th为30.4～111.5 Bq/kg_(干),~(226)Ra为7.1—34.7Bq/kg_(干),~(40)K为1069.2—2132.7 Bq/kg_(干),总β为1020.0—2492.0 Bq/kg_(干)。在鱼类中,~(238)U为4.2—12.0 Bq/kg_(干),~(232)Th为4.7—57.9 Bq/kg_(干),~(226)Ra为1.3—7.1 Bq/kg_(干)。在各种生物中~(137)Cs含量为0.4—0.9 Bq/kg_(干)。
Articles for the South China Sea near the radioactive background value monitoring work summary of the past three years. The monitoring sea area ranges from 110 ° -117 ° E and 20 ° -24 ° N. Monitoring targets include seawater, marine life and sediment. The radioactive species monitored include total U, total β, 238 U, 232 Th, 226 Ra, 40 K, 90 Sr, 137 Cs, ~ 3H, etc. . As a result, the total U in the seawater was (25.6-40.9) × 10 -3 Bq / l, the total β was (55.5-87.5) × 10 -3 Bq / l and the (90) Sr was 2.5-4.7 × 10 -3 Bq / l, 137 Cs was 2.0-4.4 × 10 -3 Bq / l, and -3H was (3.3-8.2) × 10 ~ (- 1) Bq / l. The contents of radioactive material in the sediment were ~ (238) U 51.2-99.7 Bq / kg dry, ~ (232) Th 38.1-62.1 Bq / kg dry, ~ 40 K 416.3-876.1 Bq / kg_ (dry), the total β was 569.2-921.2 Bq / kg dry, the 226 Ra was 24.3-59.1 Bq / kg dry, the 137 Cs was 1.5-2.4 Bq dry dry, . ~ (238) U was 21.0-99.2 Bq / kg_ (dry), ~ (232) Th was 30.4 ~ 111.5 Bq / kg_ (dry), ~ 226 was 7.1-34.7 Bq / , ~ (40) K was 1069.2-2132.7 Bq / kg_ (dry), total β was 1020.0-2492.0 Bq / kg_ (dry). In fish, ~ (238) U was 4.2-12.0 Bq / kg_ (dry), ~ (232) Th was 4.7-57.9 Bq / kg_ (dry), ~ 226 was 1.3-7.1 Bq / kg_ dry). In various organisms ~ (137) Cs content of 0.4-0.9 Bq / kg_ (dry).