1 / 17

Radiation Quantities and Units

Radiation Quantities and Units. Chapter 3 Sherer. Somatic effects Long term somatic Genetic effects Box 3-1. 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

neka
Télécharger la présentation

Radiation Quantities and Units

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Radiation Quantities and Units Chapter 3 Sherer

  2. Somatic effects • Long term somatic • Genetic effects • Box 3-1

  3. 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. Exposure (X) • Absorbed dose (D) • Equivalent dose (EqD) • Not factoring in the effect on tissue • Effective dose (EfD) • Overall risk based on absorbed dose, tissue and type of radiation • See Box 3-3 • Absorbed Dose

  5. 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“

  6. 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

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

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

  9. Radiobiology and Cellular Biology (Bushong Chapter 33)

  10. Pg 501 in Bushong

  11. When an atom is ionized • Chemical binding properties change • in large molecules: breakage or relocation of molecules…become abnormal • Abnormal means • Function improperly • cease to function -impairment or death of cell

  12. Damage is Reversible • Ionized atoms become neutral…How? • Molecules are mended by repair enzymes • Immediate response to radiation • Latent response • (Bushong) see Box 32-1

  13. RADIATION INTERACTS AT ATOMIC LEVEL • Atoms combine to form molecules • The body is made of macromolecules • What is the definition of macromolecules?

  14. With this kind of potential damage…. The government tends to get involved CHAPTER 9 SHERER

  15. YOU ARE RESPONSIBLE FOR DIFFERENTIATING BETWEEN • ICRP • NCRP • UNSCEAR • NAS/NRC-BEIR • NRC • EPA • FDA • OSHA

  16. DEFINE • RSC • RSO • NCRP REPORT NO 116

More Related