Direct Ionization Caused By:
Indirect Ionization Caused By:
DNA and Radiation
Ionizing Radiation at the Cellular Level
Causes breaks in one or both DNA strands or;
Causes Free Radical formation
Commonly Transported Radioisotopes
Americium-241= Diagnose thyroid disorders, smoke detectors.
Cesium-137= Cancer treatment.
Iodine-125,131= Diagnosis & treatment liver, kidney,heart, lung and brain.
Technetium-99m=Bone and brain imaging; thyroid and liver studies; localization of brain tumors.
Exposure rate = amount radiation possible to receive per unit time.
Dose = total amount of radiation received.
Radiation and Radioactivity: Units and Quantities
Department of Health
Bureau of Radiation Control
Quantities (mass, volume, time, etc.) vs. Units (grams, gallons, hours)
Units of exposure, radioactivity, and energy associated with ionizing radioactivity
As hours and minutes are to time .
ROENTGEN, RAD, REM, CURIE, GRAY, SIEVERT, BECQUEREL.
SI units vs. Standard English units
Discuss the use and conversion of unit prefixes
Transform units using “unit analysis”
Early risk associated with use of ionizing radiation
skin erythema dose - 25yrs
1928 - ROENTGEN introduced by ICRP
Pronounced rent’gen with a hard “g”
only applies to photons