MEDRADSC 3DA3 Lecture Notes - Lecture 10: Bismuth, Lead Shielding, G2 Phase

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 3DA3
• Professor: Lyndsay Simmons

Document Summary

This has coincided with a 7x increase in the radiation dose from medical procedures (from 1980-2006) Ct is 11% of the di exams done today, but contributes 67% of the effective dose. In the us, 11% of ct scans done between 2000-2007 were performed on children. Organ dose is significantly higher compared to adult population. Children don"t have the size to attenuate the beam as it moves through them. Dose increases by 50% in children, & 100% in infants (why dose optimization is crucial) Children are more susceptible to the effects of radiation for a couple of reasons: they are growing. Rapidly dividing cells that are more sensitive (g2 phase - rapid cell growth) 4-6x more sensitive to radiation than adults: they live longer. Cancer latency - period is generally 10-30 years (well within life expectancy of a child) Dose accumulation - 30% of patients will have at least 3 additional scans related to the pathology (risking.