2007年05月13日

What’s scary about radiation?


Radiation – some of it passes through an object, the other stops at an object and one other stops on its way passing through an object.

Pierce-through: This radiation just passes through an object without affecting anything. It’s something like the light that comes through window glass. The window glass is neither heated nor broken by the light getting through it.

= Safe

Stop-at an object: This radiation is absorbed into an object and the object is affected. Either stop or pass through depends upon “which radiation” touches “what”.

=Could be Unsafe

Radiation is the lightest among the rays that weigh “light”. The ones called a-ray and neutron-ray, whose weight is a quarter of a-ray, are heavy.

As easily be imagined, the radiation that has weight “stops at some kind of object, not passing through”.

Weightless radiation: Y-ray, etc.

The fact that it has no weight is the source of complication, meaning not simple.

Y-ray is that of “high energy electromagnetic wave” TV, radio, cellular phone, etc.


The X-ray used for X-ray photograph and Y-ray that is emitted in radiation pass through the protein and liquid in a body but stops at bones and others.

Weightless makes the matter complicated, because the phenomenon “weightless but get absorbed and not pass through” could mean a possibility of “passing through” or “getting absorbed” depending upon the object the radiation stops at.


In an X-ray photograph, the X-ray that passed through a body passed also through a film, making no picture. On the other hand, the X-ray that touched bones is absorbed into the bones. The X-ray being absorbed, just like the light having passed through frost glass, shows a frosty picture in the X-ray photograph. You can see the same picture as an X-ray photograph if put a bone-shaped frost glass on a transparent paraffin paper. In other words, the relation of transparent film and frost glass for light is equivalent to body and bones for X-ray.


When high-energy radiation like Y-ray is absorbed into something, bones for example, the bones are affected.

One of the affected changes is a cancer-causing transformation. Because of this, Y-ray, radiation is said to be harmful to humans.


When you are exposed to radiation, harmful changes do not necessarily occur all over your body. The part like frost glass absorbs the radiation you were exposed to, and the changes occur in the affected frost glass part, which is likely to become the source of diseases.


Above is an explanation to tell that not all the radiation is harmful to the whole body of a creature including humans.

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