616
Table 5. The numberof years needed to demonstrate at the 5 and 20% significance levels that there is a positive risk from
occupational radiation exposure if the observed mean number of excess cancers are actually at the level we calculate.
(Blanks signify > 10000 years.) These numbers maybe scaled to othersituations using eqn (5)
Significance
level
age groups
Byy
20%,
I~
16-25
3 545
26-35
)
86-45
35
46-55
57
56-65
157
16-65
23
16-95
23
All
1575
34
18
31
107
17
od
5%,
EX
IN
—
—
79
241
36
135
64
216
232
899
4]
Ss
79
88
AW)
OO1L
130
Os
119
408
64
128
Cy
20%
EX
IN
—_—
886
300
3o
136
2)
243
40
887
123
138
iG
301
1G
All
367
20
ll
26
109
13
29
5%,
EX
TN
_
3381
49
135
24
8]
64
153
292
470
39
60
82
60
All
2 164
20%,
EM
IN
_
—
188
19
90
9
243
10)
1113
416
149
51
314
112
23
V7
42
92
8
All
—_
3
6
23
133
10
8°
24
5%,
Ex
IN
—_
—_
10
37
18
35
87
$8
621
351
42
31
74
31
All
—
20
23
86
506
37
Q2
Ex
—_
4Q
68
334
2372
161
284
“WD Ja punpssiay “FS
Aso