Respuesta :
half life = 8.0 days = 8 * 24 = 192 hr
we know,
half life = 0.693 / K
192 hr = 0.693 / K
K = 3.609 * 10^-3 hr-1
time from 8.00 AM to next day 10.00 pM = 38 hr
Now,
ln (I0 / I) = K * t or
ln (1.6 / I) = 3.609 * 10^-3 * 38 or
I = 1.39 ug
mass of the nuclide remains in the patient = 1.39 ug
We know that half life = 0.693 / K
Half life = 8.0 days (8 ×24)
192 hours = 0.693 / K
Consequently, 32 hours pass between 8 AM to 6 PM the following day.
Which nuclide has the longest and shortest half life time?
- Bismuth-209 (209Bi), a radioisotope of bismuth, has the longest half-life of any radioisotope that undergoes -decay that is currently known (alpha decay). Currently, gold is the heaviest stable monoisotopic element, while lead-208 is the heaviest stable nucleus.
- Fluorine (9F) has 18 known isotopes, with ages ranging from 13 to 18.
- Fluorine is a monoisotopic and mononuclidic element since only fluorine-19 is stable and is present in nature in amounts greater than trace amounts.
- Due to 209Bi's extraordinarily long half-life, it is still possible to treat it as if it were non-radioactive for practically all purposes. It poses a negligible radiation risk because its radioactivity is far lower than that of human flesh.
- The longest half-life of any radionuclide to have been experimentally identified is that of tellurium-128 (128Te), whose half-life is projected to be 7.7 1024 years through double decay. However, 209Bi still holds the record for alpha decay (double beta decay).
To learn more about nuclide and half life time ,visit:
https://brainly.com/question/2036074
#SPJ4
