Cadmium-107 has a half life of 6.52 hours. If you start off with sample which has an activity of 1.0×1010 Bq, what will the activity in Bq be after the following times (a) 6.52 hours; (b) 3 days.

The half-life of Ra-226 is 1.60 x 10^3 years = 5.05 x 10^10 s Find k What is the activity in curies of a 1.00 g sample? What is the mass in grams of a Ra-226 sample that has an activity of 1.00 x 10^9 atoms/min?

(a) At an initial time, a radioactive sample has an activity of 8.77x104 Bq. After 3.88 hours the activity is 5.35x104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.88 hours? (A) (in s) OA: 6.426x103 OB: 9.317x103 oC: 1.351x104 OD: 1.959x104 OE: 2.840x104 OF: 4.119x104 OG: 5.972x104 (B) (in Bq) H: 8.660x104 OA: 1.387x104 OB: 1.845x104 OC: 2.454x104 OD: 3.264x104 OE: 4.341x104 OF: 5.773x104 OG: 7.678x104 OH: 1.021x105

3. (a) Calculate the decay constant for cobalt-60 (T1/2 = 5.26 Years) in units of week-¹ (b) Calculate the activity of a 5000-Ci cobalt-60 source after 10 years.

Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to incandescence for long periods of time. Natural thorium is almost 100% 232Th, with a half-life of 1.405 x 10¹0 y. If an average lantern mantle contains 270 mg of thorium, what is its activity (in Bq)? XBq t

The body of a stone-age man was found in a glacier in 1997. The body was dated using radiocarbon dating. Recall that t1/2 for 14C is 5840 yrs and R0 = 0.25 Bq for 1 g of 14C in a living organism. Material found within the body had a 14C activity R = 0.133 Bq per gram of carbon. What is the age ( in years) of the body?

The decay chain of uranium includes radon, a noble gas. When uranium in the soil decays to radon, it may seep into houses; this can be a significant source of radiation exposure. Most of the exposure comes from the decay products of radon, but some comes from alpha decay of the radon itself. If radon in the air in your home is at the maximum permissible level, the gas in your lungs will have an activity of about 0.22 Bq. Each decay generates an alpha particle with 5.5 MeV of energy, and essentially all that energy is deposited in lung tissue. Part A Over the course of 1 year, what will be the dose equivalent in Sv to the approximately 0.90 kg mass of your lungs? Express your answer in millisieverts per year. ΕΧΕΙ ΑΣΦ dose equivalent = ? mSv/yr

In 1992, Swiss police arrested two men who were attempting to smuggle osmium out of Eastern Europe for a clandestine sale. However, by error, the smugglers had picked up 137Cs. Reportedly, each smuggler was carrying a 1.0 g sample of 137Cs in a pocket! In (a) bequerels and (b) curies, what was the activity of each sample? The isotope 137Cs has a half-life of 30.2 y. (The activities of radioisotopes commonly used in hospitals range up to a few millicuries.)

The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of radioactive 40K nuclei in the body? The half life of 40K is 1.25x109 years. B)What is the amount of natural potassium (in grams) in the body? The abundance of 40K is 0.012% of the natural potassium 39K