One might have thought that plain common sense would have
suggested to the pioneers of X-rays that something invisible which could pass
right through you and leave pictures of your bones on photographic plates might
not be frightfully good for you. Fortunately for the development of science,
the arts, indeed almost all really interesting things, the one thing pioneers
seem to have in common is a shortage of that boring overrated thing common
sense. They carried recklessly on — I have seen a photograph taken in later
life of one of the Curies’ hands; it’s like a still from the ’fifties film ‘The Fly’ — and, not content
with making short-exposure photographs they came up with the fluoroscope —
great fun but (and) horribly dangerous.
In the fluoroscope the photographic plate is replaced by a
glass screen coated with something that glows — usually green — when X-rays hit
it. The subject stands between the screen and the X-ray tube, which by now was
specially made for the job, using very high voltages to make the electrons move
faster, and an anode cunningly designed to encourage them to miss it, whizzing
past to hit the glass and be transmogrified. Soon there were fluoroscopes in
all the fancy clinics, and patients would stand in front of the screen, perhaps
moving about a little or breathing in and out, for ages while doctors peered,
humming and hahing and rubbing their chins.
When I was a child the classier shoe-shops had things called
‘Pedoscopes’. Children were dragged kicking and screaming (I do wish parents
would take more notice of what their children tell them) to poke their feet,
clad in new shoes, into a hole near the bottom of the thing, and they, parents,
and shoe-seller could peer in through the top as the child wiggled its toes and
the adults nodded approvingly to see the growing-space. I found them
fascinating and unlike other children had to be dragged kicking and screaming away from them. No wonder I have flat
feet and hammer toes: these things, like the fluoroscopes used for chest
examinations, were giving people vast doses of X-rays. Pedoscopes suddenly and
quietly disappeared, almost overnight.
In the pioneer days imagination and courage to the point of
foolhardiness were virtues. Now that the great virtue is caution to the point
of pusillanimity — Raymond Chandler’s Philip Marlow talked proleptically of
people being made to live in bungalows in case they fell downstairs — X-rays
are done photographically again, even digitally, and exposures measured in
milliseconds. No doubt there are now fewer cases of people being damaged by
over-exposure to X-rays. But something less quantifiable has been lost.