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45. A 60 Сo source is labeled 7.5 mci, but its present activity is found to...
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?
(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 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
Q. 86 and 87 i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of...
Q. 86 and 87
i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of 15 hours. How many hours is three half-lives? A) 60 hours B) 45 hours C) 30 hours D) 15 hours E) 7.5 hours 87) Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 m What is the activity after 24 days? A) 96 mCi B) 16. mCi C) 8.0 mCi D) 4.0 mCi E) 2.0 mCi
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...
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...
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....
1. Cobalt 60 is commonly used as a source in industrial radiography (nondestructive testing of steel...
1. Cobalt 60 is commonly used as a source in industrial radiography (nondestructive testing of steel products by imaging with gamma radiation). A typical Co source is 100 Curies. Given a half-life of 5.27 years: (a) Calculate the mass of Co needed for a 100 Ci source (Atomic mass = 59.9338 g/mole). (b) If the source is abandoned in a warehouse for 22 years, how many half-lives have elapsed? (c) How much activity remains?
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....
(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...
Q. 86 and 87
i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of 15 hours. How many hours is three half-lives? A) 60 hours B) 45 hours C) 30 hours D) 15 hours E) 7.5 hours 87) Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 m What is the activity after 24 days? A) 96 mCi B) 16. mCi C) 8.0 mCi D) 4.0 mCi E) 2.0 mCi
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...
1. Cobalt 60 is commonly used as a source in industrial radiography (nondestructive testing of steel products by imaging with gamma radiation). A typical Co source is 100 Curies. Given a half-life of 5.27 years: (a) Calculate the mass of Co needed for a 100 Ci source (Atomic mass = 59.9338 g/mole). (b) If the source is abandoned in a warehouse for 22 years, how many half-lives have elapsed? (c) How much activity remains?
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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