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expected for groups of persons of like status in life engaged in other occupations.
I note that in table 11 data for "normal persons" are given and I wonder
whether
appreciable variations from "normal values would be found for groups of persons
of like status in life, from other industrial fields, just as in the case of your
employees.
There is no doubt that tests with dental X-rays films if made skillfully
and with comparison with suitable "blank" controls are of great value in showing
the amount of stray gamma radiation in a building containing radio active material.
The method of exposure and of development of such films must be strictly standardized
to be reliable. The degree of blackening of a film indicates the amount of
effective radiation to which a person located in the place occupied by the film
would
receive in the same period of time. Better still, a suitably wrapped film carried
by a person exposed to variable radiation should show the total exposure during the
period it is carried. After it has been established that fogging or blackening of
films occurs under the conditions just considered, it becomes a matter of prime
importance to know just how much effect per day, week, or month is dangerous.
Perhaps the limit said to have been established by Pfahler is reliable; but as I
have not done any work along this line, I am not competent to express a first-hand
opinion.
It seems to me that one would be warranted in making the tentative
assumption that the extent of the observed blood abnormalities correspond roughly,
the data being properly "weighted", to the amounts of radiation indicated by the
dental film tests.
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"ocrText": "-5-m\nexpected for groups of persons of like status in life engaged in other occupations.\nI note that in table 11 data for \"normal persons\" are given and I wonder\nwhether\nappreciable variations from \"normal values would be found for groups of persons\nof like status in life, from other industrial fields, just as in the case of your\nemployees.\nThere is no doubt that tests with dental X-rays films if made skillfully\nand with comparison with suitable \"blank\" controls are of great value in showing\nthe amount of stray gamma radiation in a building containing radio active material.\nThe method of exposure and of development of such films must be strictly standardized\nto be reliable. The degree of blackening of a film indicates the amount of\neffective radiation to which a person located in the place occupied by the film\nwould\nreceive in the same period of time. Better still, a suitably wrapped film carried\nby a person exposed to variable radiation should show the total exposure during the\nperiod it is carried. After it has been established that fogging or blackening of\nfilms occurs under the conditions just considered, it becomes a matter of prime\nimportance to know just how much effect per day, week, or month is dangerous.\nPerhaps the limit said to have been established by Pfahler is reliable; but as I\nhave not done any work along this line, I am not competent to express a first-hand\nopinion.\nIt seems to me that one would be warranted in making the tentative\nassumption that the extent of the observed blood abnormalities correspond roughly,\nthe data being properly \"weighted\", to the amounts of radiation indicated by the\ndental film tests."
}