摘要
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)。
This report summarizes the radioactive background measured in the coastal waters of South China Sea for three recent years. The sea area is located at 110°—117°E and 20°—24°N. The items included sea water, marine organisms and sediments. The radioactive materials for detection included: gross U, gross β,^(238)U,^(232)Th, ^(226)Ra,^(40)K, ^(90)Sr,^(137)Cs, ~3H, etc. The contents of radioactive materials in sea water are: gross U, (25.6—40.9)×10^(-3) Bq/1; ^(90)Sr, (2.5—4.7)×10^(-3) Bq/1; ^(137)Cs, (2.0—4.4)×10^(-3) Bq/1; gross β, (55.5—87.5)×10^(-3) Bq/1 and ~3H ,0.33-0.82 Bq/1. The contents of radioactive materials in the sediments are ^(238)U, 51.2—99.7 Bq/kg(dry); ^(232)Th, 38.1—62.1 Bq/kg(dry); ^(226)Ra, 24.3—59.1 Bq/kg(dry); ^(137)Cs, 1.5—2.4 Bq/kg(dry); ^(40)K ,416.3—876. 1 Bq/kg(dry) and gross β, 569.2—912.2 Bq/kg(dry). The contents of radioactive mateials in the marine organism are ^(238)U, 21.0—99.2 Bq/kg(dry); ^(232)Th, 30.4—111.5 Bq/kg (dry); ^(226)Ra, 7.1—34.7 Bq/kg(dry); ^(40)K, 1069.2—2132.7 Bq/kg(dry); gross β, 1020.0—2492. 0 Bq/kg(dry). The radioactive contents in fishes are: ^(238)U, 4.2—12.0 Bq/kg(dry); ^(232)Th, 4.7—57.9 Bq/kg(dry); ^(226)Ra, 1.3—7.1 Bq/kg (dry); ^(137)Cs, 0.4—0.9 Bq/kg(dry).
出处
《同位素》
CAS
北大核心
1993年第1期41-46,共6页
Journal of Isotopes
