1. Influence of nucleus
SW3

2. All radiation is not harmful
There are two types of radiation. They are non-ionizing
and ionizing. Non-ionizing radiation includes infrared
radiation, radio waves, cellphone radiation and the
radiation we use to cook food in a microwave. Such
radiation does not break chemical bonds. If it is very
intense, it can heat up tissues; otherwise, it does not have
significant effects. It is not believed to cause
cancer. Ionizing radiation is much more dangerous
because it does break chemical bonds and thus does
cause cancer. Examples of this kind of radiation include
X-rays, gamma rays and the alpha or beta particles
emitted by radioactive elements as they decay.

3. Something that happens when body
is exposed to ionizing radiation
It is changed from 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 loss and diarrhea. For radiotherapy for
tumors, the exposure generally stops after that point and
the symptoms are controlled. But with heavier exposure,
the next stage is generally destruction of the intestinal
lining and worse diarrhea and dehydration, then central
nervous system damage. After that comes loss of
consciousness and, inevitably, death.

4. Difference between radiation and
nuclear bomb released from nuclear
plant's
There are difference between them. A nuclear explosion
has two types of radiation that have lethal effects. The
blast itself produces X-rays and gamma rays that irradiate
anyone near the site, usually with a lethal or near-lethal
dose of radiation. Most of the 166,000 Japanese who
died at Hiroshima in the first four months after the atomic
bombing suffered from this type of radiation, which killed
them directly or aggravated other injuries suffered in the
blast.

5. It also produces clouds of radioactive ash that includes
cesium-137, iodine-131, radioactive strontium and a host of
other long-lived byproducts of the explosion -- known
collectively as fallout. This material can collect on skin and
clothing, where it can emit radiation that pierces the skin. More
important, it can accumulate in food, milk, water and other
products that are ingested. It is not clear how many Hiroshima
residents died of cancer from this source, but some estimates
put it at more than 100,000. But Fukushima is not emitting
gamma or X-irradiation. Most of the radioactivity is in the form
of radiocesium and radioiodine, which are byproducts of the
fission of uranium in the fuel rods.

6. Cesium-137 and Iodine-131
Cesium-137 and iodine-131 are dangerous for human. We can
absorb preferentially Iodine-131 in the thyroid gland, where it
can cause tumors. It has a half-life of eight days and is most
dangerous to children because it damages rapidly dividing
cells. The problem can be substantially ameliorated by taking
tablets of ordinary iodine, which bind to the thyroid and prevent
the radioactive iodine from binding. Cesium-137 is more
serious. It is a salt that acts like potassium and goes
everywhere in the body. It is absorbed into soft tissues, causing
sarcomas. It contaminates food, water and milk and gets into
the body when those things are ingested. Contamination with
cesium-137 is one of the main reasons large areas of land had
to be abandoned in the wake of the Chernobyl disaster in 1986.

7. Radiation in Japan
The levels of exposure are not told in detail. Radiation levels were
reported to have jumped to about 400,000 microsieverts per hour
inside the Fukushima plant after an explosion Tuesday, although the
levels subsided rapidly. Sustained exposure to this level of radiation
would be extremely hazardous. Levels outside the plant would have
been substantially lower. Civilians who have been exposed to
radiation have been treated by simply getting their clothes washed and
being given showers because the exposure has been so
minimal. Workers in the plant will receive the highest exposure, but
they are outfitted with full protective gear, wear radiation badges and
work for shifts of only an hour or two at a time. According to news
reports, radiation levels in Tokyo have been 10 times normal, which is
still very low.

8. s1180190
Ryo Namekata
http://articles.latimes.com/2011/mar/16/health/la-he-japan-
quake-radiation-20110316/2