Lesson 9 Flashcards
(19 cards)
acute exposure
short-term, high-level exposure
chronic exposure
long-term, low-level exposure
somatic effects
not as concerned as germ effects, biological damage from ionizing radiation
non-stochastic (deterministic )
The severity of the effects varies with the dose, and a threshold value exists
Effects appear quickly
stochastic
increased exposure makes these health effects more likely to occur, non threshold
ARS
acute radiation syndrome follows a high level radiation exposure
4 stages of ARS
prodromal period
latent period
manifest period
recovery or death
prodromal stage
nausea, vomiting, diarrhea
radiation sickness appears
latent period
patient is healthy and looks good, from hours to weeks
manifest period
Three syndromes make it occur;
hematologic syndrome
gastrointestinal syndrome
central nervous system syndrome
Hematopoietic syndrome
Damage to bone marrow
mean survival 6-8 weeks
gastrointestinal syndrome
damage to the GI and bone marrow
mean survival 3-14 days
CNS syndrome
blood vessel damage leads to intracranial pressure
death within 3 days
lethal dose
The amount of radiation that kills half of the population
lethal dose for humans
3 Gy
local tissue damage
any part of the body recieves a high radiation dose could be patrial or complete
radiodermatitis
reddening of the skin by excessive low level exposure
what do pluripotential stem cells develop into
lymphocytes, granulocytes, plateles, erythrocytes
