EXHIBIT 7

Ontario Ministry of Housing: Table 4

LUNG CANCER DEATHS IN HIROSHIMA FROM RADIATION EXPOSURE

Relative Risk Factors Derived From Persons Exposed in Hiroshima

Average Dose Equivalent (rem)
[1]
Lung Cancers Observed per 1000
[2]
Lung Cancers Expected per 1000
[3]
Excess Lung Cancers per 1000
EC = [2] - [3]
Relative Risk Factor (Excess cancers per WLM per 1000 cancers expected)
RRF = ( EC x 1000 ) / ( [1] x [3] )
61.3
49
34.4
14.6
7
190.2
13
9.0
4.0
2
413.0
10
5.8
4.2
2
1213.1
8
4.4
16.6
1
215.6
80
53.6
26.4
2.3

Notes

  1. The data for this table are taken from Sources and Effects of Ionizing Radiation, United Nations Scientific Committee on the Effects of Ionizing Radiation (UNSCEAR), Report to the United Nations General Assembly, 1977. With Annexes.

  2. Using   1 WLM = 4 rem   (a very conservative conversion factor) we see that the first four categories given here correspond to  15 WLM ,   48 WLM ,   103 WLM ,   and   303 WLM .

    Using   1 WLM = 5 rem   (the factor suggested by the US National Academy of Sciences) we see that the first four categories given here correspond to  12 WLM ,   38 WLM ,   83 WLM ,   and   243 WLM . These are certainly low exposures, in the context of uranium mining.

  3. There is a tripling between the last two risk factors (average = 1.5) and the first two risk factors (average = 4.5) .

    There is a quadrupling between the last three risk factors (average = 1.7) and the first one (7.0) .

    It seems that the extra risk per WLM becomes ever more pronounced as the exposure gets progressively lower.

  4. To convert the risk factors in the last column to risk factors per WLM , multiply each entry by the appropriate conversion factor (e.g. if  1 WLM = 4 rem ,  then multiply each entry by 4 ; if  1 WLM = 5 rem ,  then multiply by 5.) The Ham Commission Report states that typical conversion factors are   1 WLM = 5-6 rem   (page 116).

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