Thoron Gas Concentration and Aerosol Characteristics of Thoron Decay Products
Thoron Gas Concentration and Aerosol Characteristics of Thoron Decay Products
复制标题
DOI：
10.1093/oxfordjournals.rpd.a081559
复制
发表时间：
1992-12
影响因子：
1
通讯作者：
A. Reineking;G. Butterweck;J. Kesten;J. Porstendörfer
中科院分区：
文献类型：
--
作者：
A. Reineking;G. Butterweck;J. Kesten;J. Porstendörfer
室内测量得到了212Pb谱分布，积累模的平均中值直径约为200 nm。平均13%的活性与中值直径小于80 nm的原子核模式有关，约5%的活性被确定为独立的。在哥廷根附近进行的室外测量表明，平均87%的活动附着在中值直径在300-400 nm之间的气溶胶颗粒上，10%的活动对应于原子核模式。有时，在直径为微米的粗模尺寸范围内会发现很小的活度分数(平均为3%)。在不同的房间内测量了1到39Bq·m-3的平均Thoron气体浓度。衰变产物浓度分别为0.08~0.93Bq·m~(-3)和0.02~0.44Bq·m~(-3)。室内测量的C(212Bi)/C(212Pb)平均值为0.4，室外平均值为0.3。
Indoor measurements yield212Pb size distributions with a mean median diameter of the accumulation mode of about 200 nm. An average fraction of 13% of the activity is associated with the nuclei mode with median diameters smaller than 80 nm and about 5% of the activity was determined to be unattached. Outdoor measurements performed in the vicinity of Gottingen show that on average 87% of the activity is attached to aerosol particles with median diameters between 300 and 400 nm and 10% of the activity corresponds to the nuclei mode. Sometimes a small activity fraction (average 3%) was found in the coarse mode size range with diameters of some microns. Average thoron gas concentrations between 1 and 39 Bq.m-3were measured in different rooms. The decay product concentrations of212Pb and212Bi ranged between 0.08 and 0.93 Bq.m-3and 0.02 and 0.44 Bq.m-3, respectively. The mean ratio C(212Bi)/C(212Pb) of the indoor measurements was 0.4 and the outdoor value 0.3.