Question

Problem 1:   A 60Co source (which has a half-life of 5.2714 y) is labeled 4.00 mCi,...

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 1.7 × 107 Bq.

Part (a) What is the present activity in mCi?

Part (b) How long ago did it actually have a 4.00 mCi activity in years?
Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. You find an old 60Co source in the physics lab that is labeled 4.00 mCi....
1. You find an old 60Co source in the physics lab that is labeled 4.00 mCi. When you test it, you find out that its activity is now 4.85×107 Bq. a. What is its current activity in mCi? b. How long ago did it actually have a 4.00 mCi activity? 2. Use the following data to determine the chemical atomic mass of neon, to two decimal places. Mass number (A) 20, 21, 22 Atomic mass (u)19.992435, 20.993841, & 21.991383 Natural...
BIOPHYSICS 1. Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713...
BIOPHYSICS 1. Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713 years. It is an isotope that emits gamma rays essential to the medical community for cancer treatments, as well as sterilization of medical devices. Cobalt-60 is used as a radiation source for medical radiotherapy where it is used in cancer treatment to control or kill malignant cells. Cobalt-60 is used as the radiation source in Gamma Knife equipment that enables non-surgical treatment of brain...
BIOPHYSICS Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713 years....
BIOPHYSICS Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713 years. It is an isotope that emits gamma rays essential to the medical community for cancer treatments, as well as sterilization of medical devices. Cobalt-60 is used as a radiation source for medical radiotherapy where it is used in cancer treatment to control or kill malignant cells. Cobalt-60 is used as the radiation source in Gamma Knife equipment that enables non-surgical treatment of brain tumors....
BIOPHYSICS Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713 years....
BIOPHYSICS Cobalt-60 (60Co), is a synthetic radioactive isotope of cobalt with a half-life of 5.2713 years. It is an isotope that emits gamma rays essential to the medical community for cancer treatments, as well as sterilization of medical devices. Cobalt-60 is used as a radiation source for medical radiotherapy where it is used in cancer treatment to control or kill malignant cells. Cobalt-60 is used as the radiation source in Gamma Knife equipment that enables non-surgical treatment of brain tumors....
Many radioisotopes have important industrial, medical, and research applications. One of these is 60Co, which has...
Many radioisotopes have important industrial, medical, and research applications. One of these is 60Co, which has a half-life of 5.20 years and decays by the emission of a beta particle (energy 0.310 MeV) and two gamma photons (energies 1.17 MeV and 1.33 MeV). A scientist wishes to prepare a 60Co sealed source that will have an activity of at least 10.2 Ci after 43.0 months of use. If the activity is 10.2 Ci, how many 60Co atoms are in the...
A radioactive sample contains 2.94 μg of pure11C, which has a half-life of 20.4 min. a)...
A radioactive sample contains 2.94 μg of pure11C, which has a half-life of 20.4 min. a) How many moles of 11C is present ini- tially? The value of Avogadro’s number is 6.02 × 1023 nuclei/mol. Answer in units of mol. b) Find the number of nuclei present initially. Answer in units of nuclei. c)Find the initial activity of the sample. Answer in units of Bq. d)Find the activity of the sample after 6.97 h. Answer in units of Bq.
You have a sample of a radioactive material with a half-life of 5.0 years that has...
You have a sample of a radioactive material with a half-life of 5.0 years that has a current activity of 0.12 µCi. The sample has a label on it which indicates that when it was first manufactured it had an activity of 3.84 µCi. How long ago was the sample manufactured? (to 2 s.f and in years)
Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. Part A How many beta...
Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. Part A How many beta particles are emitted in 250s by a 2.90mg sample of 60-Co? Part B What is the activity of the sample in Bq?
10. A radioactive source has a half-life of 14.0 minutes. Its activity is 5.00 microCuries at...
10. A radioactive source has a half-life of 14.0 minutes. Its activity is 5.00 microCuries at 10:00 AM. (a) What is the decay constant of the source? (b) How many parents are present at 10:00 AM? (c) What is the activity at 10:42 AM? (d) How many parents are present at 10:42AM? (e) How many disintegrations occur between 10:00 AM and 10:42 AM? (f) How many daughters are born during this time interval?   
Carbon 14 (146C, mass of 14.003242u, half-life of 5730 years) can be used to date things...
Carbon 14 (146C, mass of 14.003242u, half-life of 5730 years) can be used to date things that were once living. When a particular tree fell, a chunk of that tree would have had an activity of 15 decays/minute. Now, that chunk of the tree has a total of 1x10-12 g of carbon 14 in it. How long ago did the tree fall? [3436.6 yrs]
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT