NAVAL RESEARCH LABORATORY
TABLE6
‘ - Effect of Mesh Size and Electrical Condition
on Screen Collections
Screen
Activity
MeshSize
:
(4/m)
40
80
60
| 80
Ratio
4,500
3, 800
1.2
1,400 -
0.9
2,500
1,900 .
1.3
.
15,000
1.1
1,500
200
80
200
{80
-
14,000
200:
2,100
200
101, 000
1.3
80
2,600
80
|
75, 000
80 (insulated)
0.81
80 (grounded)
7,600
9,400
1.2
80 (grounded)*
80 (grounded)*
4,700
4,700
1.0
*Duplicate collections made to check
reproducibility .
.
y
TABLE 7
.
Comparison of Pack-Filter Collections Made Prior to and
During Operation TEAPOT
Date of .
Percent of Total Activity
Collection
;
Top Filter Middle Filter |Bottom Filter
Residual Activity Prior to TEAPOT
_
1/31 -2/7/55|
41
18
41
2/14 - 2/21
54
25
21
= 2/14
57
’ Average
- §1
24
19
22
27
Activity from TEAPOT
2/21, - 2/28
2/28 - 3/7
- 3/14
~ Average
-
|
53
47
50
50
17
21
25
21
-
30
32
25
__29