A Geiger counter is placed at a distance 2m from a Cobalt 60 source emitting γ rays. The measured count rate is 545/min.. What is the count rate when the Geiger counter is moved to a new position 7m from the 60Co? Select one: a. 25.43/s b. 3.24/s c. 44.5/min d. 71.22/s

Q: A thyroid cancer patient is given a dosage of 131 I (half-life=8.1 d) What fraction of the dosage of…

A:

Q: We use a Geiger counter to measure RT, the total counting rate (in counts per minute) due to a…

A: We need to justify wheater the given statement is true or false.

Q: please answer D 2. Caesium-137 decays via β - emission with a half-life of 30.17 years. A sample is…

A:

Q: ing on a Geiger counter at 155 cm from a radiation source was 7.620 x 10^3 counts per minute (cpm).…

A: Given:- The distance of the Geiger counter from radiation sourced = 155 cm  The reading of the…

Q: Sodium-24 is a radioisotope used for examining circulation. a. Write a balanced nuclear equation for…

A: The radioactivity equation is  N = No12n where, No is the initial number of atoms, N is the atoms…

Q: Estimate to the two significant digits the number of nucleons per cubic femtometer (fm^3) in…

A: Let's consider a typical nucleus with three nucleons. The radius of the typical nucleus is given by…

Q: In the following reaction, which type of decay is occurring? 226, 222, 88Ra sRn+ beta plus beta…

A: Give data: Radioactive decay equation

Q: A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage…

A:

Q: 1. A radioactive substance has a half-life period of 60 days What is the disintegration constant?…

A:

Q: 15. An 85 kg person was exposed to a gamma source and received a whole body dose of 0.5 Sv. How much…

A: The dose equivalent is given by

Q: Graph of average binding energy per nucleon, MeV (y axis) against nucleon number, A (x axis)

A: The schematic graph of average binding energy per nucleon (in MeV) against nucleon number (A) is…

Q: I Review I Const A sample of 1.5x1010 atoms that decay by alpha emission has a half-life of 90 min…

A: Given: half life t1/2 = 90min initial number of atoms = No=1.5*1010 atoms

Q: Calculate the radiation dosage (in grays) for an 67-kg person that is exposed for 5.0 seconds to a…

A: The energy released in the form of the beta radiation is:

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N…

A: The equation for activity is,

Q: sheets of cardboard would be necessary to block 99% of beta radiation

A: Solution

Q: 12. A radioactive contaminant gives an unfortunate 0.5 kg lab rat a dose of 1500 rem in just 1…

A:

Q: A 70-kg person experiences a whole-body exposure to alpha radiation (RBE=15) with energy 4.77 MeV. A…

A:

Q: What is the binding energy per nucleon of 24 Pb? Give your answer in MeV

A: Mass defect of Pb is

Q: If a rock containing U-238 initially reads 41.2 counts per minute on a Geiger counter, what will its…

A: The reading after 6 weeks will be 41.2 counts per minute

Q: If a vial contains 400 MBq of fluorine-18 (F-18) at 12:00 on 20 March 2019, how much radioactivity…

A: The half-life of F-18 is 109.7 minutes. The time difference between the starting time and end time…

Q: A person working with several nuclear isotope separation processes for a two-month period receives a…

A: In the given question , We have to determine the total effective dose in  rem.

Q: The common isotope of uranium, 238U, has a half-life of 4.47 * 109 years, decaying to 234Th by alpha…

A: Given data: The half-life of the uranium isotope is T=4.47x109 yr.   Part-(a) The expression for…

Q: Explain why 231-Th-90 is likely to be a beta minus emitter

A: Why 231-Th-90 is likely to be a beta minus emitter.

Q: An 85 kg person was exposed to a gamma source and received a whole body dose of 0.5 Sv. How much…

A:

Q: Calculate the radiation dosage (in rads.) for an 77-kg person that is exposed for 6 .0 seconds to a…

A: The energy released in the form of beta radiation is

Q: We use a Geiger counter to measure YT, the total yield (in counts) due to a radioactive source with…

A: Everyone on the Earth is exposed to background radiation. The three primary sources of background…

Q: A point source of gamma radiation has a half-life of 45.0 minutes. A Geiger counter placed 3.00m…

A: We need two fomulas to solve this problem   1.  If N0 is the no. of gamma rays emerges from a source…

Q: In one year, a man working with radioactive materials receives a dose of 7.8 mGy to his lungs from…

A: (a) The equivalent dose absorbed by lungs from alpha radiation can be determined as, Here, HL, Wα…

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

A:

Q: Radiation from a point source follows an inverse-square law in which the amount of radiation…

A: At 2m, the Geiger reading is,

Q: RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N…

A: Given: Iodine-120 , I-120 has half life, T1/2 = 1.35 hours. = 4860 s Initial activity , A0 = 1 Ci

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: A Geiger counter is placed at a distance 2m from a Cobalt 60 source emitting γ rays. The measured…

A: The intensity of radiation decreases with distance from a source because the radiation diverges from…

Q: 41.3 70% of the radiation from a gamma emmitter is blocked by 1 cm of steel shielding. How many 1 cm…

A: Given: % OF RADIATION BLOCKED BY 1CM SHIELD  = 70 %

Q: Question 4. A synthetic radioisotope is freshly prepared in a lab that has an ac- tivity of 10.0…

A: Initial activity (Ao) = 10 mCi Final activity (A) = 8 mCi t = 5 hr

Q: r measures 80 counts per minute. After TWO hours have gone by, what counts will the Geiger counter…

A:

Q: 1ug of 210Po emits 1.7 x 105 alpha particles per second: If each of these particles a represents a…

A:

Q: The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of…

A: mass of person (m) = 70 kg Activity (A)  = 5000 Bq Half life of K40 = 1.25×109 years

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.