The activity of this sample after 3  half-lives have elapsed is approximately what?

Q: An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life…

A: Half life radioisotope =t= 8days . Let maximum permissible level be = N⁰ then , radiation emissions…

Q: An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life…

A:

Q: What is the relationship between decay constant and mean life of a radioactive nucleus?

A: The mean life of a radioactive nucleus is calculated by using the formula τ=1λ , where λ is the…

Q: A radiation worker stands 50 cm away from a radioactive source of 25 mCi "Co. Calculate the exposure…

A:

Q: A small region of a cancer patient’s brain is exposed for 24.0 min to 475 Bq of radioactivity from…

A: Given data: Time t=24 min =1440seconds Emission rate =475 Bq Amount of dose =1.858g=0.001 Energy E=…

Q: A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register…

A:

Q: If a material has a half life of 92.5 days, how long will it take for 75% of the material to decay?…

A: Half life of the material=92.5days 75% of the material decay

Q: Time taken by a radioạctive nuclei hauing a half life of T years, to reduce to 3.125% of its…

A:

Q: How many halE lives would hae to elapse for a Sample of a radioachtve isotope to decraase Of 3cpm?…

A:

Q: A 54 kg laboratory worker is exposed to 27 mJ of neutron radiation with an RBE of 10. What is the…

A:

Q: Radioactive indium-111 has an effective half-life of 2.5 days.If a dose with an activity of 3.0 mCi…

A:

Q: A 50 kg nuclear plant worker is exposed to 20 mJ of neutron radiation with an RBE of 10. What is the…

A: The expression to solve for the dose of the neutron radiation is as follows:…

Q: In terms of biological damage, how many rad of heavy ions are equivalent to 100 rad of x - rays?

A: Write the expression for the biological damage caused by the X-rays with a quality factor of 1.

Q: A radioactive substance is found to register 5000 counts per second on a Geiger counter.…

A:

Q: A nuclear chemist receives an accidental radiation dose of 5.0 Gy from slow neutrons 1RBE = 4.02.…

A: To find: To find the dose in terms of rad, rem, and J/kg using the given units.

Q: If we have a nucleus (A = 110), its volume is?

A: Here, it is given that, a nucleus has A = 110. We have to find its volume . Let’s see how we will…

Q: The activity of 14C14C in a 70 -kg-kg human body is estimated to be 3.7 kBqkBq . What is this…

A:

Q: A radioactive sample contains 2048 nuclie. How many of its nuclei decay after two half lives?

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Q: Binding energy per nucleon for an element is 7.14 MeV. If the binding energy of the element is 28.6…

A:

Q: To date the age of the oldest materi als, scientists would normally tum to the radioactivity of a.…

A:

Q: A certain biological sample is given a dose of 7.50 rad from alpha particles. (WR = 20) Calculate…

A: Given :- a dose of 7.50 rad from alpha particles WR = 20 Equivalent dose HT  = absorbed dose * WR =…

Q: If a rock containing U-238 initially reads 40.4 counts per minute on a Geiger counter, what will its…

A:

Q: What is the dose in Sv in a cancer treatment that exposesthe patient to 200 Gy of γ rays?

A: The expression for the required dose in SV is,

Q: A radioactive sample has a half-life of 3 days. Its current activity is 100 μCi . What was its…

A:

Q: As the mass number of nucleons increases, what happens to the binding energy per nucleon?

A: discuss about the binding energy  with increase in mass number of nucleon.

Q: What is rate of decay after 2.5 seconds?

A:

Q: An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life…

A: Given : half life of radioactive = 4 days Radiation measured = 8 times max level R = 8R0 .

Q: number of alpha-decays of Q in the first one hour is;

A: Given: Determine number of alpha decays of Q in the first one hour ?Where,   A heavy nucleous Q of…

Q: A pure sample of a newty discovered radioactive isetope is discovered. I has a halt-ife of 59 min.…

A:

Q: Calculate the binding energy per nucleon of 4He , the alpha particle.

A: The total binding energy is  B.E=∆mc2 where ∆m is the mass defect and c is the speed of light.  The…

Q: If Th-234 emits a beta particle, what nucleus is formed?

A:

Q: A drug tagged with Tc (half-life = 6.05 h) is prepared for a patient. If the original activity of…

A: GivenHalf life (T1/2)=6.05 hActivity of sample (A0)=1.5×104   Bq

Q: A 5000-Ci60Co source used for cancer therapy is considered too weak to be useful when its activity…

A: The ratio of the activity is an exponential function of decay activity and the time period. The time…

Q: A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the…

A: The exposure rate is given by

Q: The disintegration rate of a certain radioactiv sample at any instant is 4750 disintegrations per…

A: Decay constant determines the rate of decay. Here, we calculate  the given as follow;

Q: You find a 37.2 g fossilized bone that has an activity of 0.024 counts per second. How old is the…

A: A living matter has 1.3×10-10 % of C-14, and the half-life of C-14 is 5730 years. Thus, determine…

Q: What is the activity (in particles/s) of a sample of Carbon-14 that contains 4.109E+21 nuclei?

A:

Q: iodine 131 has a half life of 8.04 days if you start with a radioactivr I 131 sample having an…

A: Half life of I-131 isotope = 8.04 days Initial activity (Ao) = 40 micro Ci Final activity (A) = 4…

Q: Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally…

A:

Q: A radioactive isotope has a half-life of 10 minutes. At the start of an experiment, the activity of…

A:

Q: Find the radiation dose in Gy for: 160 mSv of β- and rays from the 40K in your body.

A: The dose in Sv is Gy=SvRBE For beta ray and gamma ray the radiation energy is RBE=1.

Q: An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life…

A:

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.