Helen's Mulberry Lane Farm Journal
November 20, 2010.
Someone wrote to Gerald recently asking about the new body scanners at airports and if there are any radiation risks associated with them.
The Transportation and Security Act (TSA) now has full body scanners at 60 airports across the country causing quite a hub-bub in the news and online blogs, etc. Much misinformation abounds on this topic. Since Gerald has a Ph. D. in physics, (University of Toronto), he is in a good position to answer this question. I know many of you will be traveling by air this holiday season. Maybe it will answer some concerns you may have, as well.
When you get into this sort of topic, you are in the relative-risk category.
Everything we do, in this fallen world, has an associated health risk, which
cannot be reduced to zero. (There are no utopias down here.) So all we can
do is try to make choices which minimize our risk.
For example, if I go out in my car to buy groceries, there is a chance
(small, but not zero) that I will get in a car accident and be killed. If I
stay home and don't buy groceries, there is a larger risk that I will starve
to death. So I take the smaller risk, without giving it much further
thought. (Indeed, it isn't worthy of much further thought.) I know, from
experience, that the risk is real but small. I judge the risk to be worth
the benefit. I would judge differently if I didn't need to eat. Why risk a
trip to the grocery store for nothing?
The same thing is going on with airport scanners. They, too have an
associated health risk. But it is a very small risk --- probably
significantly less than traffic accident injury. The general population has
no feeling for this (i.e., they have virtually no real-life experience with
radiation risk), so they have to rely on experts who have made it their
business to learn the numbers on this. The experts tell us, pretty clearly,
that health risk from these scanners is very small. They are right about
this as far as objective scientific knowledge is concerned, and I can see no
rational reason to doubt them. So I would personally not be in the least
alarmed to be scanned by an airport scanner in preparation for a flight ---
in the same sense in which I would not be in the least alarmed to hop in my
car and go get groceries. Still, if I did not need to be scanned, I
I routinely avoid dental x-rays for myself and my family because
there is a (small) cancer risk associated with all x-rays and I find that
the dentist can, in fact, 99% of the time, do what needs to be done just
fine without them.
Unfortunately, due to certain individuals wishing to
blow up airplanes, we (American citizens) find the (very small) risk due to
use of airport scanners to be unavoidable. So we use them, accepting the
fact that their benefit significantly outweighs their risk.
Happy Thanksgiving! Thank God for freedom in the good ol' USA!
Photo by Helen Aardsma, October , 2010.
More next time......