Today I’m going to talk about: Radiation effects
I’ve divided my presentation into one parts:
First I’d like to introduce radiation effects, and second I’ll deal
with the effects.
So, let’s start with introduce radiation effects
Radiation Effects,
effects observed when ionizing radiation strikes living tissue and
damages the molecules of cellular matter. Cellular function may be
temporarily or permanently impaired from the radiation, or the cell may be
destroyed. The severity of the injury depends on the type of radiation, the
absorbed dose, the rate at which the dose was absorbed, and the
radiosensitivity of the tissues involved. The effects are the same, whether
from a radiation source outside the body or from material within.
1) Biological,
The biological effects of a large dose of radiation delivered rapidly
differ greatly from those of the same dose delivered slowly. The effects of
rapid delivery are due to cell death, and they become apparent within
hours, days, or weeks. Protracted exposure is better tolerated because some
of the damage is repaired while the exposure continues, even if the total
dose is relatively high. If the dose is sufficient to cause acute clinical
effects, however, repair is less likely and may be slow even if it does
occur. Exposure to doses of radiation too low to destroy cells can induce
cellular changes that may be detectable clinically only after some years.
2) ACUTE EFFECTS
High whole-body doses of radiation produce a characteristic pattern of
injury. Doses are measured in grays or rads, 1 gray being equal to the dose
absorbed when one kilogram of matter absorbs one joule of ionizing