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 230 mg of thorium, what is its activity (in Bq)?

The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 1.0*10^ 3Bq. The activity in a similar-sized sample of fresh wood is measured to be 6.9*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.

Answer the following questions about the radiochemistry involved in PET scans. All answers are numerical. (Hint: 1 mCi is exactly 3.7 x 107 Bq. ) a) Fluorine-18 can be synthesized by smashing tritium (3.01605 amu) into 16O (15.99491 amu), which results in the formation of 18F (18.00094 amu) and a neutron (1.00866 amu) according to the this reaction: 3H + 16O → 18F + n How much energy is emitted per mole in this reaction? ________x 10¹¹ J/mol b) If the initial dose of 18F (t1/2 = 109.8 min) received by the patient is 12.00 milliCurie (mCi), what is the disintegration rate (in mCi) in the patient's body at exactly 24 hours after they receive that initial dose? ________x 10-⁹ mCi need both parts or else I will downvote

The activity of C-14 can be used to determine the age of some archaeological discoveries. Suppose a sample of ancient wood which contains C-14 has an activity of 7.50 x 10^-4 Ci. The half life of C-14 is 5730 years. What will be the activity of this sample after 250 years?