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Radiation Protection

Biological Aspects of Radiation

Biological Effects of Radiation Random may or may not result in biological changes.
True or False There is no way to predict which cells will be affected by irradiation? True
Negative effects of radiation detectable only after time and in the form of a different disease is called? Latent Period
What is Radiation? Form of energy part of electromagnetic spectrum made up of units of energy called photons
True or False Photons have no mass or weight True
Photons travel in... Wave motion differentiated by wavelength
Electromagnetic Radiations with long wave lengths are Low-energy radiations can travel great distances but little penetrating power.
Ionizing Radiation Shorter wavelength, higher penetrating power
True or False Ionizing radiation cannot displace electrons in an atoms orbit leaving atom charged and ionized. False
Linear dose-response relationships Dose and response are directly proportional to each other.
For Threshold-Dependent linear relationship radiation must reach minimal amount before negative affects
For Linear non threshold dose-response no response to dose until certain level reached.
Linear non threshold curve describes describes relationships b/w radiation dose & the occurrence &induced cancers & genetics effects.
Linear non threshold curve effects considered random or stochastic and no predictable dose for occurrence.
Non Threshold causes Negative Effects
Linear non threshold curve used in prescribing Radiation Protection
non linear dose response dose and response are not directly proportional
non linear curve is the non linear S curve also called Sigmoid Curve
non linear or sigmoid curve need great amount of radiation before effect is seen and small amounts there after.
Non-Stochastic or predictable non linear threshold curve or sigmoid curve
Dose-response relationships describe amount of radiation applied and biological effect and described as linear or non linear
Linear relationship means Biological effect is directly proportional.
Term Threshold is applied to Linear and non linear relationships to define the dose below which no negative effects of radiation are detected.
Lethal dose of radiation that will result in death of 50% of the population within 30 days of exposure is called LD 50/30
Lethal Dose for humans 250-450 rad
3 major categories of radiation sickness Hematopoietic syndrome, gastrointestinal syndrome, and central nervous system syndrome
Hematopoietic Syndrome occurs at lowest dose ( 100-1000) rad
most sensitive to radiation exposure Hematopoietic ( causes decrease in red blood cells clotting cells resulting in decrease in immune response and blood clotting ability
individual may die with 30 days from secondary disease or Hemorrhage
Gastrointestinal syndrome occurs at 600-1000 rad causes abnormal function of GI
experience nausea, vomiting, ulcerations, and hemorrhage and may die within 10-14 days Gastrointestinal syndrome
confusion,disorientation,ataxia and increase in intracranial pressure and seizures,agitation,and shock Central Nervous System syndrome ( death usually within 14-36 hrs)
Created by: 100000250877027