Equivalent Dose = Absorbed Dose x Radiation weighting factor HT = DX WR re some Radiation weighting factors: ation Tyne Radiation weighting factor (Wol RBE - Dose of standard radiation required to produce an effect (Dref) Dose of radiation being tested to produce the SAME effect (Dr) RBE = Dref Dr Definition of Exposure . • • • The interaction of radiation waves with particles of air results in charged ions. Exposure is defined as the quantity of charged ions per unit mass of air. E = m Unit of exposure is Ckg1 (coulomb per kilogram) E is exposure Q is the quantity of charge on the ions (Coulomb, C) m is the unit mass of air (Kilograms, kg) TAQ 5: Assessment criteria 3.3 1. Calculate the absorbed dose of radiation for tissue that suffers a mean energy absorbed of 0.42 Joules in a quantity of tissue that has a mass of 60 grams. 2. What is the effective dose received by the prostate gland for an external source in a case where the absorbed dose is 760 J/kg and the radiation is in the form of beta particles. The tissue weighting factor for prostate gland tissue is 0.05. 3. Calculate the mass of air that has received an x-ray exposure of 0.00038 Ckg. The charge of the air after the radiation has passed through is 28 x 10-17 C. 4. During an experiment 30% of a tissue is damaged by 8Gy of 250keV energy X-ray. The same damage is made in the same tissue by 3Gy of protons, 1.2 GY of neutrons and 0.5Gy of alpha rays. Calculate the RBE for protons neutrons and alpha rays.

Equivalent Dose = Absorbed Dose x Radiation weighting factor HT = DX WR re some Radiation weighting factors: ation Tyne Radiation weighting factor (Wol RBE - Dose of standard radiation required to produce an effect (Dref) Dose of radiation being tested to produce the SAME effect (Dr) RBE = Dref Dr Definition of Exposure . • • • The interaction of radiation waves with particles of air results in charged ions. Exposure is defined as the quantity of charged ions per unit mass of air. E = m Unit of exposure is Ckg1 (coulomb per kilogram) E is exposure Q is the quantity of charge on the ions (Coulomb, C) m is the unit mass of air (Kilograms, kg) TAQ 5: Assessment criteria 3.3 1. Calculate the absorbed dose of radiation for tissue that suffers a mean energy absorbed of 0.42 Joules in a quantity of tissue that has a mass of 60 grams. 2. What is the effective dose received by the prostate gland for an external source in a case where the absorbed dose is 760 J/kg and the radiation is in the form of beta particles. The tissue weighting factor for prostate gland tissue is 0.05. 3. Calculate the mass of air that has received an x-ray exposure of 0.00038 Ckg. The charge of the air after the radiation has passed through is 28 x 10-17 C. 4. During an experiment 30% of a tissue is damaged by 8Gy of 250keV energy X-ray. The same damage is made in the same tissue by 3Gy of protons, 1.2 GY of neutrons and 0.5Gy of alpha rays. Calculate the RBE for protons neutrons and alpha rays.