Radiologic Quantities and Units PDF

RADIOLOGIC QUANTITIES AND UNITS  Roentgen (R )  Air Kerma (Gya) The Roentgen is the unit of radiation exposure or intensity Amount of radiation and is defined as the charge liberated per unit mass of air Applies only to x-ray and gamma rays and their interaction with air Kinetic...

RADIOLOGIC QUANTITIES AND UNITS  Roentgen (R )  Air Kerma (Gya) The Roentgen is the unit of radiation exposure or intensity Amount of radiation and is defined as the charge liberated per unit mass of air Applies only to x-ray and gamma rays and their interaction with air Kinetic Energy Released per unit MAss  Roentgen (R )  Air Kerma (Gya) 1R = 2.08 x 10 ip/cm 9 3 1R = 2.58 x 10 C/kg -4 1R = 2.54 x 10 C/kg -4  Rad  Gray (Gyt) Radiation Absorbed Dose Radiation Absorbed by a patient Measure of the effect of radiation and is defined as the energy absorbed by a unit mass of a substance  Rad  Gray (Gyt) 1 rad = 100 erg/g 1 rad = 10-2 Gy 1 rad = 0.01 Gy (same lang sa taas) Erg or joule- unit of energy Kg/gram- unit of mass  Rem  Sievert (Sv) Radiation Equivalent Man Dose equivalent Effective dose Equivalent dose Used to express the quantity of radiation received by radiation worker and population  Rem  Sievert (Sv) 1 Sv = 100 rems 0.01 Sv = 10 mSv = 1 rem  Curie (Ci) Bequerel (Bq) Curie is the unit of radioactivity Number of nuclear disintegrations per unit time. Curie (Ci) Bequerel (Bq) 1 Ci = 3.7 x 10 Bq 10 1mCi = 3.7 x 10 Bq 7 Customary SI UNIT unit Roentgen X 0.01 =Air Kerma Rad X 0.01 =Gy Rem X 0.01 =Sv Curie X 3.7 X 10 10 =Bq  SI UNIT Customary Unit Air Kerma ÷ 0.01 =Roentgen Gy ÷ 0.01 =Rad Sv ÷ 0.01 =Rem Bq ÷ 3.7 X 10 10 =Curie END