Being exposed to radiation
When you are exposed to radiation,
whether the source of exposure is external or internal determines the effect on your body.
This page introduces the difference between being exposed to radiation from external or internal.
whether the source of exposure is external or internal determines the effect on your body.
This page introduces the difference between being exposed to radiation from external or internal.
To be exposed to radiation from external
If your skin sticks radioactive material,your body influenced by radiation from there.
It is called to be exposed to radiation from external,
however if you wash radioactive material away or dump it,you don't influenced radiation
because to be exposed to radiation from external differs to be exposed to radiation from internal.
A typical example is X-rays.
The main causes of to be exposed to radiation from external is natural radiation and radiation from space.
Kind and quantity that you are exposed to radiation vary according to the place, soil, sea level and latitude.
A lot of radioactive material is found at the rocky cave,
a few radioactive material is found at place where there are much water.
（examine minutely →『Natural radiation』）
It is important to keep away from place where you know a lot of radiation to reduce to be exposed to radiation from external however,
you need a lot of measures to be exposed to radiation from internal.
Gamma rays, beta rays and so on can measure a radiation measuring instrument like “Hakarukun” recently.
To be exposed to radiation from internal
Radioactive material collected at the inside thehuman body like a born, internal organs and so
on by breathing and eating, so what you receive
the radiation is to be exposed to radiation from
internal.Anyhow the radiation is discharge but it
takes for the time being so you keep exposed to radiation all the time.
For example, radioactive iodine 131 collects on the thyroid gland, strontium collects on born and cesium collects on muscle and blood.
It is easy to display symptom by each radioactive material collects each tissue. Strontium collects on born so it attack marrow and organ that hematogenous functions so you fell leukaemia. However, radioactive material has a half-life so quantity what to be exposed to radiation from internal is gradually decrease.
The human body moves complicate so it is not easy to measure correctly quantity what to be exposed to radiation from internal. Radiation quantity can expect by the human body moves complicate is research and Equipment that Whole body counter is used to measure correctly quantity.