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225 Ac 9.9 d 221Fr de days 4.8 m h hours meminutes Sseconds ms milliseconds usmicroseconds X1 32 ms X2 X3 42 ys 45.6 m X5 | 209BI X4 22m 3.3h stable This figure' shows that the decay "chain" starts with an a decay of 225 Ac to produce 2Fr, which itself undergoes a decay to "X1", and so on, until the final production of the stable 20"Bi isotope via a beta- decay process from "XS". Note that isotope "X2" has two different decay channels, both of which result in "XS": 98% of "X2" undergoes B' decay to "X3" (which subsequently decays by emitting a to produce "XS"), while 2% of "X2" decays to "X4" via a decay (which subsequently undergoes B decay to "X5"). Given the type of decay process, provide the element and nucleon number (e.g. 2"Fr) for each of the isotopes X1, X2, X3, X4 and X5. 1. 2. Assume a chemist in Dr. Ramogida's lab requires 8 hours from the time of receipt of 225Ac to incorporate it into a chemically synthesized carrier compound that can be used for cancer treatment. If they are given 0.450 mg of 2*Ac, what is the mass of 2Ac remaining at the end of the 8 hours, given its half-life of 9.9 days? 3. If their compound is shipped around the world for treatment of cancer patients, a key consideration is how long it remains active. Starting with the amount that leaves Dr. Ramogida's lab, for how long does at least 10% of the 2Ac remain, which could be used for treatment? The half-life of 2Fr is considerably shorter than 2Ac: 4.8 minutes. Would you recommend to Dr. Ramogida's team to try to synthesize molecules that can target Francium to tumours, rather than 4. using Actinium? Explain your reasoning.

225 Ac 9.9 d 221Fr de days 4.8 m h hours meminutes Sseconds ms milliseconds usmicroseconds X1 32 ms X2 X3 42 ys 45.6 m X5 | 209BI X4 22m 3.3h stable This figure' shows that the decay "chain" starts with an a decay of 225 Ac to produce 2Fr, which itself undergoes a decay to "X1", and so on, until the final production of the stable 20"Bi isotope via a beta- decay process from "XS". Note that isotope "X2" has two different decay channels, both of which result in "XS": 98% of "X2" undergoes B' decay to "X3" (which subsequently decays by emitting a to produce "XS"), while 2% of "X2" decays to "X4" via a decay (which subsequently undergoes B decay to "X5"). Given the type of decay process, provide the element and nucleon number (e.g. 2"Fr) for each of the isotopes X1, X2, X3, X4 and X5. 1. 2. Assume a chemist in Dr. Ramogida's lab requires 8 hours from the time of receipt of 225Ac to incorporate it into a chemically synthesized carrier compound that can be used for cancer treatment. If they are given 0.450 mg of 2*Ac, what is the mass of 2Ac remaining at the end of the 8 hours, given its half-life of 9.9 days? 3. If their compound is shipped around the world for treatment of cancer patients, a key consideration is how long it remains active. Starting with the amount that leaves Dr. Ramogida's lab, for how long does at least 10% of the 2Ac remain, which could be used for treatment? The half-life of 2Fr is considerably shorter than 2Ac: 4.8 minutes. Would you recommend to Dr. Ramogida's team to try to synthesize molecules that can target Francium to tumours, rather than 4. using Actinium? Explain your reasoning.

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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|225 дс| 9.9 d a 221Fr d = days h = hours 4.8 m m = minutes s = seconds a ms = milliseconds us = microseconds X1 32 ms a X2 X3 98% B" 45.6 m 4.2 us 2% a |209Bİ B- X4 X5 2.2 m 3.3 h stable This figure' shows that the decay "chain" starts with an a decay of 225Ac to produce 221Fr, which itself undergoes a decay to "X1", and so on, until the final production of the stable 20°B¡ isotope via a beta- decay process from "X5". Note that isotope "X2" has two different decay channels, both of which result in "X5": 98% of “X2" undergoes B decay to "X3" (which subsequently decays by emitting a to produce "X5"), while 2% of "X2" decays to "X4" via a decay (which subsequently undergoes B" decay to "X5"). 1. Given the type of decay process, provide the element and nucleon number (e.g. 22"Fr) for each of the isotopes X1, X2, X3, X4 and X5. Assume a chemist in Dr. Ramogida's lab requires 8 hours from the time of receipt of 225 2. Ac to incorporate it into a chemically synthesized carrier compound that can be used for cancer treatment. If they are given 0.450 mg of 225 Ac, what is the mass of 225 Ac remaining at the end of the 8 hours, given its half-life of 9.9 days? 3. If their compound is shipped around the world for treatment of cancer patients, a key consideration is how long it remains active. Starting with the amount that leaves Dr. Ramogida's lab, for how long does at least 10% of the 225Ac remain, which could be used for treatment? The half-life of 221Fr is considerably shorter than 225AC: 4.8 minutes. Would you recommend to Dr. Ramogida's team to try to synthesize molecules that can target Francium to tumours, rather than using Actinium? Explain your reasoning. 4. "Figure adapted from "Development of 225AC Radiopharmaceuticals: TRIUMF Perspectives and Experiences", by Robertson, Ramogida, Schaffer and Radchenko. Current Radiopharmaceuticals 11, 156 (2018)
Transcribed Image Text:|225 дс| 9.9 d a 221Fr d = days h = hours 4.8 m m = minutes s = seconds a ms = milliseconds us = microseconds X1 32 ms a X2 X3 98% B" 45.6 m 4.2 us 2% a |209Bİ B- X4 X5 2.2 m 3.3 h stable This figure' shows that the decay "chain" starts with an a decay of 225Ac to produce 221Fr, which itself undergoes a decay to "X1", and so on, until the final production of the stable 20°B¡ isotope via a beta- decay process from "X5". Note that isotope "X2" has two different decay channels, both of which result in "X5": 98% of “X2" undergoes B decay to "X3" (which subsequently decays by emitting a to produce "X5"), while 2% of "X2" decays to "X4" via a decay (which subsequently undergoes B" decay to "X5"). 1. Given the type of decay process, provide the element and nucleon number (e.g. 22"Fr) for each of the isotopes X1, X2, X3, X4 and X5. Assume a chemist in Dr. Ramogida's lab requires 8 hours from the time of receipt of 225 2. Ac to incorporate it into a chemically synthesized carrier compound that can be used for cancer treatment. If they are given 0.450 mg of 225 Ac, what is the mass of 225 Ac remaining at the end of the 8 hours, given its half-life of 9.9 days? 3. If their compound is shipped around the world for treatment of cancer patients, a key consideration is how long it remains active. Starting with the amount that leaves Dr. Ramogida's lab, for how long does at least 10% of the 225Ac remain, which could be used for treatment? The half-life of 221Fr is considerably shorter than 225AC: 4.8 minutes. Would you recommend to Dr. Ramogida's team to try to synthesize molecules that can target Francium to tumours, rather than using Actinium? Explain your reasoning. 4. "Figure adapted from "Development of 225AC Radiopharmaceuticals: TRIUMF Perspectives and Experiences", by Robertson, Ramogida, Schaffer and Radchenko. Current Radiopharmaceuticals 11, 156 (2018)
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