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Radiation Quantities and Units

Radiation Quantities and Units. Chapter 3 Sherer. Review-Pages 53-56. Somatic effects Long term somatic Genetic effects Box 3-1. Page 56-58- specifically. Tolerance dose was replaced with Maximum Permissible dose (MPD)-dose limits-effective dose

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Radiation Quantities and Units

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  1. Radiation Quantities and Units Chapter 3 Sherer

  2. Review-Pages 53-56 • Somatic effects • Long term somatic • Genetic effects • Box 3-1

  3. Page 56-58- specifically • Tolerance dose was replaced with Maximum Permissible dose (MPD)-dose limits-effective dose • Safe occupations (clerical) has a risk of 10 -4 per year- same as radiography • EfD – type of radiation and the sensitivity of the tissue being exposed. The Sievert is the unit of measurement

  4. Focus on these terms and definitions-page. Begins on pg 58 • Exposure (X) • Absorbed dose (D) • Equivalent dose (EqD) • Effective dose (EfD) • Overall risk based on absorbed dose, tissue and type of radiation • See Box 3-3 (see next slide) • Absorbed Dose

  5. Box 3-3(follow-up questions see assignment for this class) Equivalent Dose • EqD=D x Wr • Or • Sv=Gy x Wr Effective dose • EfD=D xWr x Wt

  6. Quality Factor, pg 63 Sherer • LET pg 63 Sherer "rate in which energy is deposited in the form of a charged particle or ion pair as it travels through matter“

  7. Rem = RAD x QF • LETS of 3% or less have a QF of 1 = same amount of damage of rad per rem • QUALITY FACTOR and weighting factor OF ALPHA IS 20 See box Table 3-2 Sherer • 1 RAD = 20 REM FOR ALPHA PARTICLE ABSORPTION

  8. WHICH HAS A HIGHER LET NUMBER? • X-rays (HIGH OR LOW?) • Alpha (HIGH OR LOW?) • Beta (HIGH OR LOW?) • Gamma (HIGH OR LOW?)

  9. WR associated with Equivalent Dose- table 3-2 • WT associated with Effective Dose- table 3-3

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