A 22Na source is labeled 3.00 mCi, but its present activity is found to be 3.47...
A 22Na source is labeled 3.00 mCi, but its present activity is found to be 3.47 ✕ 106 Bq.
(a) What is the present activity in mCi?
(b) How long ago did it actually have a 3.00-mCi
activity?
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A 22Na source is labeled 3.00 mCi, but its present
activity is found to be 3.47...
45. A 60 Сo source is labeled 7.5 mci, but its present activity is found to...
45. A 60 Сo source is labeled 7.5 mci, but its present activity is found to be 1.35x10 Bq. (a) What is the present activity in mci? mci. (b) How long ago in years did it actually have a 4.00-mCi activity? years. Check
(50%) Problem 1: A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00...
(50%) Problem 1: A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00 mCi, but its present activity is found to be 1.1 x 10' Bq Randomized Variables R = 1.1 × 107 Bq 50% Part (a) What is the present activity in mCi? Grade Summary 0% 100% Potential cosO cotanasin acos( atan0 acotansinhO coshO tanh cotanhO O Degrees O Radians in tan 兀 Submissions Attempts remaining: 7 (3%per attempt) detailed view 0 Submit Hint I give...
A. An 53,000 L swimming pool is filled with water. If deuterium is 0.0128% of natural...
A. An 53,000 L swimming pool is filled with water. If deuterium is 0.0128% of natural hydrogen, find the energy released in 1014 joules if this deuterium is fused via the reaction 2H + 2H → 3He + n. Hint: this reaction releases 3.27 MeV of energy each time deuterium is fused. B. Calculate the radius in femtometers of an atom with 132 nucleons. C. A 60Co source is labeled 4.1 mCi, but its present activity is found to be...
A sample of radioactive material is initially found to have an activity of 114 Bq. After...
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When...
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When delivered to a hospital 13 hours later, its activity is 95 mCi. a.)What is the isotope's half life? th=___________ h b.)If the minimum usable activity is 10mCi, how long after delivery at the hospital is the sample usable? t=__________h
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How...
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How much time must elapse before the activity is reduced to… (a) 85%? (b) 25%? (c) 5%? B) The half-life of a radioactive source is 14.0 minutes. - How much time must elapse before the activity is reduced by… (a) 70%? (b) 45%? (c) 20%? C) Radon-222 has a physical half-life of 30.0 days. A 10.24 microgram piece of this source is placed in storage....
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay...
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay constant in units of s1? Knowing that radium occurs naturally at about 1.2 pCi/L, how many radioactive nuclei would be present in a 12.5 kL swimming pool? b. c. What then would be its initial activity in Bq? If the 12.5 kL of water was from an ancient ceremonial pool in Egypt for the private use of King Tut, after 3500 years what would...
The decay curve of a radioactive nuclide sample is shown. Its initial activity is measured to...
The
decay curve of a radioactive nuclide sample is shown. Its initial
activity is measured to be X Bq.
14. What is the population at t=8.0
15. After how many half lives will the population be 125
nuclides?
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?
17. What would the activity of the above sample be if we
tripled its size?
18. If the initial activity of 0.356 grams of...
Problem 6. (10 pts) The isotope 60Co is commonly used as a source of g rays in high-level industr...
Problem 6. (10 pts) The isotope 60Co is commonly used as a source of g rays in high-level industrial irradiation cells. How many kg of 60Co are needed to achieve an activity of 106 curie = 3.7x1010 decays per second? After what time interval will the activity of such a cell have decreased to 10% of its initial value?
Problem 6. (10 pts) The isotope 60Co is commonly used as a source of g rays in high-level industrial irradiation cells....
1. Of the 4 labeled disinfectants, which have antimicrobial activity and which do not? 2. Of...
1. Of the 4 labeled disinfectants, which have antimicrobial activity and which do not? 2. Of those that have antimicrobial activity, which one has the greatest? 9. 3. What is present in the plate that indicates antimicrobial activity? 4. Could there be any reason other than "significant antimicrobial activity that a zone of inhibition is very large? shutterstock.com . 1461769682 SLIDE 3 KIRBY-BAUER ANTIBIOTIC SENSITIVITY PLATE USING MEULLER-HINTON AGAR 1. What does each disc have a precise amount of? 2....
45. A 60 Сo source is labeled 7.5 mci, but its present activity is found to be 1.35x10 Bq. (a) What is the present activity in mci? mci. (b) How long ago in years did it actually have a 4.00-mCi activity? years. Check
(50%) Problem 1: A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00 mCi, but its present activity is found to be 1.1 x 10' Bq Randomized Variables R = 1.1 × 107 Bq 50% Part (a) What is the present activity in mCi? Grade Summary 0% 100% Potential cosO cotanasin acos( atan0 acotansinhO coshO tanh cotanhO O Degrees O Radians in tan 兀 Submissions Attempts remaining: 7 (3%per attempt) detailed view 0 Submit Hint I give...
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay constant in units of s1? Knowing that radium occurs naturally at about 1.2 pCi/L, how many radioactive nuclei would be present in a 12.5 kL swimming pool? b. c. What then would be its initial activity in Bq? If the 12.5 kL of water was from an ancient ceremonial pool in Egypt for the private use of King Tut, after 3500 years what would...
The
decay curve of a radioactive nuclide sample is shown. Its initial
activity is measured to be X Bq.
14. What is the population at t=8.0
15. After how many half lives will the population be 125
nuclides?
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?
17. What would the activity of the above sample be if we
tripled its size?
18. If the initial activity of 0.356 grams of...
Problem 6. (10 pts) The isotope 60Co is commonly used as a source of g rays in high-level industrial irradiation cells. How many kg of 60Co are needed to achieve an activity of 106 curie = 3.7x1010 decays per second? After what time interval will the activity of such a cell have decreased to 10% of its initial value?
Problem 6. (10 pts) The isotope 60Co is commonly used as a source of g rays in high-level industrial irradiation cells....
1. Of the 4 labeled disinfectants, which have antimicrobial activity and which do not? 2. Of those that have antimicrobial activity, which one has the greatest? 9. 3. What is present in the plate that indicates antimicrobial activity? 4. Could there be any reason other than "significant antimicrobial activity that a zone of inhibition is very large? shutterstock.com . 1461769682 SLIDE 3 KIRBY-BAUER ANTIBIOTIC SENSITIVITY PLATE USING MEULLER-HINTON AGAR 1. What does each disc have a precise amount of? 2....
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