The document discusses the potential health effects of radiation exposure from the Fukushima Daiichi nuclear power plant crisis. It explains that ionizing radiation can break chemical bonds and cause cancer if exposure levels are high enough. Initial symptoms of radiation sickness include nausea, fatigue and vomiting, while very high exposure leads to organ damage, loss of consciousness and death. Certain radioactive isotopes like Cesium-137 and Iodine-131 are especially dangerous if ingested due to accumulation in soft tissues and the thyroid gland. The document provides exposure levels in microsieverts that correspond to different health effects ranging from mild sickness to death.

1. Possible health effects of
nuclear crisis
July 18 - July 24
Article #1

2. Introduction
Fukushima NO.1 power plant don't avert a meltdown.unclear
authorities have reported that spikes of radiation have escaped
from the facility at levels that can be dangerous to human
health.so many people within 20 km of the plant escape the
area. we look at the potential radiation effect human health.

3. what are kind of radiation damaging for
people?
radiation have two types of radiation , non-ionizing and ionizing
Non-ionizing radiation includes infrared radiation,radio waves,
cellphone and the radiation we use to cook food in a
microwave.non-ionizing radiation don't have hazardous effect .
But ionizing is much more dangerous ionizing radiation does
break chemical bonds and thus does cause cancer.

4. How effect when human is exposed to
ionizing radiation.
The damaging depends on how long you are exposed.The
initial symptoms are identical to those suffered by a person
undergoing radiation therapy for cancer. the first signs include
nausea and fatigue, then vomiting. After that comes hair comes
hair loss and diarrhea. And heavier exposure is generally
destruction of the intestinal lining and worse diarrhea and
dehydration, then central nervous system damage.After that
comes loss of consciousness and death.

5. How does radiation from nuclear plants
compare with a nuclear bomb?
A nuclear explosion produces two types of radiation that have
lethal effect.That blast itself produces X - rays and gamma rays
that irradiate anyone near the site, usually with a lethal or near-
lethal dose of radiation.the radiation kill people directly or
aggravates other injuries suffered in the blast.
clouds of radioactive ash that includes cesium -137,iodine-131,
radioactive strontium and a host of other long lived byproducts
of the explosion.This material can collect on skin and clothing,
where it can emit radiation that pierces the skim.More
important, it can accumulate in food, milk,water and other
products that are ingested. nuclear plant are byproducts of the
fission of uranium in the fuel roods

6. What makes cesium -137 and iodine-
131 dangerous?
iodine-131 is absorbed preferentially in the thyroid gland,I has a
half-life of eight days and is most dangerous to children
because it damages rapidly dividing cells.
Cesium -137 has a half life of30 years. it is absorbed into soft
tissues, causing sarcomas.it contaminates food, water and milk
and gets into the body when those things are ingested.

7. How much exposure is enough to make
someone sick?
The biological risk of exposure to radiation is measured in
sieverts.
1 An exposure of 500,000 microsieverts can lead to nausea
and fatigue within hours.
2 A does of 750,000 microsieverts cause hair loss within two or
three weeks,
3 A dose of 1 million microsieverts will cause hemorrhage.
4 Death usually at a dose of 4million microsieverts.

8. Summary
the radiation effect human health but we should understand
how to effect of nuclear radiation so we don't worry about too
nervous.