THE SIZE AND THE DURATION OF AIR-CARRIAGE OF RESPIRATORY DROPLETS AND DROPLET-NUCLEI
THE SIZE AND THE DURATION OF AIR-CARRIAGE OF RESPIRATORY DROPLETS AND DROPLET-NUCLEI
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DOI：
10.1017/s0022172400019288
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发表时间：
1946-01-01
影响因子：
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通讯作者：
DUGUID, JP
中科院分区：
文献类型：
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作者：
DUGUID, JP
研究人员在打喷嚏、咳嗽和说话时，将12000个液滴收集在塞璐珞载玻片上。在每次测试之前，将刚果红或其他染料引入口腔，以促进对液滴的识别。在一个裂隙取样器中，测量了21,000个含染色滴核的载玻片。原始液滴的大小从1到2000不等，其中大多数（约95%）的直径< 100[亩]，而直径在4到8[亩]之间的液滴最多。打喷嚏时小飞沫的比例大于咳嗽或说话时。液滴核在0.25 ~ 42个之间，多数为12个或更少，最常见的是1 ~ 2个。据计算，在普通喷嚏中的100万个飞沫中，约有6.2万个含有细菌的飞沫小到足以留在空气中；咳嗽用的，不。是710，而大声说100个单词，相应的数字是36。在打喷嚏的人身上也研究了液滴核的持久性。在1700立方米。一间70平米的大房间。英国《金融时报》。90%携带细菌的颗粒在30 ~ 60 min内消失；较小的核，很少含有细菌，在空气中停留的时间更长。当在排气过程中使用风扇时，液滴核的持续时间要短得多。
Measurements were made of 12,000 droplets collected on celluloid slides held in front of the mouth during sneezing, coughing and speaking. Congo red or other dye was introduced into the mouth before each test to facilitate recognition of the droplets. 21,000 stain-containing droplet nuclei on oiled slides exposed in a slit-sampler were measured. The original droplets were considered to have varied in size from 1 to 2,000 with the majority (about 95%) being < 100 [mu] in diam. and those between 4 and 8 [mu] most numerous. The proportion of smaller droplets was greater in sneezing than in coughing or speaking. The droplet nuclei ranged from 0.25 [mu] to 42 [mu], the majority being 12 [mu] or less and those of 1-2 [mu] most common. It was calculated that of a million droplets in an ordinary sneeze about 62,000 bacteria-containing droplets are small enough to remain airborne; for a cough the calc. no. was 710 and, for speaking loudly 100 words, the comparable figure was 36. Persistence of droplet-nuclei was also studied in sneezing expts. in a 1700 cu. ft. room and in a 70 cu. ft chamber. 90% of the bacteria-carrying particles disappeared in 30 to 60 min.; smaller nuclei, few of which contained bacteria, remained airborne much longer. When a fan was used during an expt., the duration of droplet-nuclei was much more brief.