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2. The 10-fold X-ray reduction values for (a) water, (b) concreate, (c) iron and (d) lead are equal 100 cm, 20 cm, 10 cm and 5 cm, respectively. Find corresponding values of linear attenuation cocfficients. RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: Ci = 3.7 x 10" Bq 1. Nuclear decay law: N = Noe-at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828. is the base of the natural logarithm, and à is the decay constant for the nuclide (1/s). 2. Relationship between decay constant à and isotop half-life T,/2: 0.693 A= (2) Radioisotope Carbon-11 Half-life Modality T1/2 where A is decay constant (1/s), T1/2 is isotope half- Fuorine-18 life (s). 3. Activity or decay rate of a radioactive source A: Gallum-67 ΔΝ T1/a 20 minutes PET 110 minutes PET Copper-84 12.7 hours PET 78.3 hours SPECT Galium-68 68 minutes PET SPECT = AN Technetum-99m 6.02 hours At where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at timet Thallum-201 (s ), a is decay constant (1/s). 4. Activity A of a radioactive source at a time t: Indium-111 67.3 hours SPECT lodine-123 13.22 hours SPECT 72.9 hours SPECT A = Age"dt = A,2"Fala A, is initial activity (Bq), T1/2 half life time of an isotope (s). 5. Relationship between mass and number of nuclei: т м NA m is mass (kg), M is molar mass (kg/mole), N is number of nuclei, NA = 6.022 - 1023 mole" is Avogadro's constant.

2. The 10-fold X-ray reduction values for (a) water, (b) concreate, (c) iron and (d) lead are equal 100 cm, 20 cm, 10 cm and 5 cm, respectively. Find corresponding values of linear attenuation cocfficients. RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: Ci = 3.7 x 10" Bq 1. Nuclear decay law: N = Noe-at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828. is the base of the natural logarithm, and à is the decay constant for the nuclide (1/s). 2. Relationship between decay constant à and isotop half-life T,/2: 0.693 A= (2) Radioisotope Carbon-11 Half-life Modality T1/2 where A is decay constant (1/s), T1/2 is isotope half- Fuorine-18 life (s). 3. Activity or decay rate of a radioactive source A: Gallum-67 ΔΝ T1/a 20 minutes PET 110 minutes PET Copper-84 12.7 hours PET 78.3 hours SPECT Galium-68 68 minutes PET SPECT = AN Technetum-99m 6.02 hours At where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at timet Thallum-201 (s ), a is decay constant (1/s). 4. Activity A of a radioactive source at a time t: Indium-111 67.3 hours SPECT lodine-123 13.22 hours SPECT 72.9 hours SPECT A = Age"dt = A,2"Fala A, is initial activity (Bq), T1/2 half life time of an isotope (s). 5. Relationship between mass and number of nuclei: т м NA m is mass (kg), M is molar mass (kg/mole), N is number of nuclei, NA = 6.022 - 1023 mole" is Avogadro's constant.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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2. The 10-fold X-ray reduction values for (a) water, (b) concreate, (c) iron and (d) lead are equal 100 cm, 20 cm, 10 cm and 5 cm, respectively. Find corresponding values of linear attenuation cocfficients.
Transcribed Image Text:2. The 10-fold X-ray reduction values for (a) water, (b) concreate, (c) iron and (d) lead are equal 100 cm, 20 cm, 10 cm and 5 cm, respectively. Find corresponding values of linear attenuation cocfficients.
RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: Ci = 3.7 x 10" Bq 1. Nuclear decay law: N = Noe-at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828. is the base of the natural logarithm, and à is the decay constant for the nuclide (1/s). 2. Relationship between decay constant à and isotop half-life T,/2: 0.693 A= (2) Radioisotope Carbon-11 Half-life Modality T1/2 where A is decay constant (1/s), T1/2 is isotope half- Fuorine-18 life (s). 3. Activity or decay rate of a radioactive source A: Gallum-67 ΔΝ T1/a 20 minutes PET 110 minutes PET Copper-84 12.7 hours PET 78.3 hours SPECT Galium-68 68 minutes PET SPECT = AN Technetum-99m 6.02 hours At where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at timet Thallum-201 (s ), a is decay constant (1/s). 4. Activity A of a radioactive source at a time t: Indium-111 67.3 hours SPECT lodine-123 13.22 hours SPECT 72.9 hours SPECT A = Age"dt = A,2"Fala A, is initial activity (Bq), T1/2 half life time of an isotope (s). 5. Relationship between mass and number of nuclei: т м NA m is mass (kg), M is molar mass (kg/mole), N is number of nuclei, NA = 6.022 - 1023 mole" is Avogadro's constant.
Transcribed Image Text:RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: Ci = 3.7 x 10" Bq 1. Nuclear decay law: N = Noe-at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828. is the base of the natural logarithm, and à is the decay constant for the nuclide (1/s). 2. Relationship between decay constant à and isotop half-life T,/2: 0.693 A= (2) Radioisotope Carbon-11 Half-life Modality T1/2 where A is decay constant (1/s), T1/2 is isotope half- Fuorine-18 life (s). 3. Activity or decay rate of a radioactive source A: Gallum-67 ΔΝ T1/a 20 minutes PET 110 minutes PET Copper-84 12.7 hours PET 78.3 hours SPECT Galium-68 68 minutes PET SPECT = AN Technetum-99m 6.02 hours At where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at timet Thallum-201 (s ), a is decay constant (1/s). 4. Activity A of a radioactive source at a time t: Indium-111 67.3 hours SPECT lodine-123 13.22 hours SPECT 72.9 hours SPECT A = Age"dt = A,2"Fala A, is initial activity (Bq), T1/2 half life time of an isotope (s). 5. Relationship between mass and number of nuclei: т м NA m is mass (kg), M is molar mass (kg/mole), N is number of nuclei, NA = 6.022 - 1023 mole" is Avogadro's constant.
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