ENVIRONMENTAL NEUTRALIZATION OF POLONIUM-218
ENVIRONMENTAL NEUTRALIZATION OF POLONIUM-218
复制标题
DOI：
10.1021/es00132a006
复制
发表时间：
1985-01-01
影响因子：
11.4
通讯作者：
HOPKE, PK
中科院分区：
文献类型：
--
作者：
GOLDSTEIN, SD;HOPKE, PK
Rn 对 U 工人和公众产生潜在的不利健康影响。 Rn 衰变产物（包括 218Po）会产生这些不利影响。先前的工作表明存在两种中和单电荷 Po 离子的机制。带电的 218Po 通过与 O 反应形成电离势高于 Po 金属的氧化钋离子，然后接受从较低电离势气体转移的电子来中和。通过确定氧化钋的电离势在10.35-10.53 eV范围内，验证了该机制。此前也有报道称，在没有 O2 的情况下，通过痕量气体（即 H2O 或 NO2）清除电子并将其扩散到 Po 离子，218Po 被中和。为了验证第二种中和机制，我们检查了 N 中 NO2 浓度在 50 ppb-1 ppm 范围内中和 Po 离子的能力。当 NO2 浓度 > 700 ppb 时，观察到 218Po 完全中和。对于浓度 < 700 ppb，中和程度随 NO2 浓度平稳增加。
Rn produces potential adverse health effects in U workers and the general public. Rn decay products including 218Po produce these adverse effects. Previous work indicated that 2 mechanisms of neutralization of the singly charged Po ion existed. Charged 218Po was neutralized by reacting with O to form a polonium oxide ion with a higher ionization potential than that of the Po metal and then accepting an electron transferred from a lower ionization potential gas. This mechanism was verified by determining that the polonium oxide had an ionization potential in the range 10.35-10.53 eV. It was also previously reported that 218Po was neutralized, in the absence of O2, by the scavenging of electrons by a trace gas, i.e., H2O or NO2 and their diffusion to the Po ion. To verify this 2nd neutralization mechanism, concentrations of NO2 in N in the range of 50 ppb-1 ppm were examined for their ability to neutralize the Po ion. Complete neutralization of 218Po was observed at NO2 concentrations > 700 ppb. For concentrations < 700 ppb, the degree of neutralization increased smoothly with NO2 concentration.