Cs-137 source used in mining industry has an activity of 740 MBq as of March 30,...
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Cs-137 source used in mining industry has an activity of 740 MBq as
of March 30,...
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs,...
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
Please show all work. 5. What is the activity of a Cs-137 source on Jan 11,...
Please show all work.
5. What is the activity of a Cs-137 source on Jan 11, 2010. The original activity was 25 mCi on Dec 4, 2000. Page 16 of your book: A= Aoe® A,-Original Activity A- final activity λ= decay constant T1/2 = ln2 / λ [ In2= 0.693]
Kr-85 source used in paper company had an activity of 18.5 GBq as of January 15,...
Kr-85 source used in paper company had an activity of 18.5 GBq as of January 15, 2007. What will be its activity on Dec 15, 2010 when T(1/2) or half-life = 10.7 yrs?
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used...
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used in cancer treatment, has a half- Part A Enter the balanced nuclear equation for the beta decay (e) of cesium-137 Express your answer as a nuclear equation. Α. ΑΣφ on? Subrnit Previous Answers Request Answer Part B How many milligrams of a 24 mg sample of cesium-137 remain after 120 years? Express the mass to two significant figures and include the appropriate units. Value...
The 137Cs source used for gamma rays in the Compton scattering experiment has a half-life of 30.1...
1.
2.
The 137Cs source used for gamma rays in the Compton scattering experiment has a half-life of 30.17 years. Suppose that the initial absolute activity of a source N years ago was lo 5.46 mCi (milli-Curies) 202 million disintegrations/s. Suppose that the initial absolute activity of the 137Cs source (lo 5.46 mCi) occurred N-16.3 years ago. The expected absolute activity today, N years later, is mCi. mci You want to deduce the total gamma-ray activity from the 137Cs source...
The Fukushima nuclear reactor accident caused the environmental release of significant amounts of radioactive caesium (Cs)...
The Fukushima nuclear reactor accident caused the environmental release of significant amounts of radioactive caesium (Cs) isotopes. Specifically, caesium-134 and caesium- 137, which have half-lives of, respectively, two years and 30 years. The survey of soil radioactivity conducted in June 2011 revealed soil surface Cs-134 activity of about 500,000 Bq/m2 in the town of Okuma (roughly 10 km from the stricken power plant) and Cs-137 activity of roughly the same level. Disregarding any other changes or cleanup efforts since then,...
Swifty Mining Company has purchased a tract of mineral land for $1,278,000. It is estimated that...
Swifty Mining Company has purchased a tract of mineral land for
$1,278,000. It is estimated that this tract will yield 170,400 tons
of ore with sufficient mineral content to make mining and
processing profitable. It is further estimated that 8,520 tons of
ore will be mined the first and last year and 17,040 tons every
year in between. (Assume 11 years of mining operations.) The land
will have a salvage value of $42,600.
The company builds necessary structures and sheds...
I know how to solve normal 1/2 life equations but this one is confusing me! Please...
I know how to solve normal 1/2 life equations but this one is
confusing me! Please help me get both parts.
I know the standard equations of
t(1/2) = ln(2) / k & At= A0 e ^ (-kt)
but those didn't work when i tried. i got stuck! thanks! :)
This question has multiple parts. Work all the parts to get the most points. Radioactive cobalt-60 is used extensively in nuclear medicine as a γ-ray source. It is made by...
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How...
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How much time must elapse before the activity is reduced to… (a) 85%? (b) 25%? (c) 5%? B) The half-life of a radioactive source is 14.0 minutes. - How much time must elapse before the activity is reduced by… (a) 70%? (b) 45%? (c) 20%? C) Radon-222 has a physical half-life of 30.0 days. A 10.24 microgram piece of this source is placed in storage....
Please show all work.
5. What is the activity of a Cs-137 source on Jan 11, 2010. The original activity was 25 mCi on Dec 4, 2000. Page 16 of your book: A= Aoe® A,-Original Activity A- final activity λ= decay constant T1/2 = ln2 / λ [ In2= 0.693]
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used in cancer treatment, has a half- Part A Enter the balanced nuclear equation for the beta decay (e) of cesium-137 Express your answer as a nuclear equation. Α. ΑΣφ on? Subrnit Previous Answers Request Answer Part B How many milligrams of a 24 mg sample of cesium-137 remain after 120 years? Express the mass to two significant figures and include the appropriate units. Value...
1.
2.
The 137Cs source used for gamma rays in the Compton scattering experiment has a half-life of 30.17 years. Suppose that the initial absolute activity of a source N years ago was lo 5.46 mCi (milli-Curies) 202 million disintegrations/s. Suppose that the initial absolute activity of the 137Cs source (lo 5.46 mCi) occurred N-16.3 years ago. The expected absolute activity today, N years later, is mCi. mci You want to deduce the total gamma-ray activity from the 137Cs source...
Swifty Mining Company has purchased a tract of mineral land for
$1,278,000. It is estimated that this tract will yield 170,400 tons
of ore with sufficient mineral content to make mining and
processing profitable. It is further estimated that 8,520 tons of
ore will be mined the first and last year and 17,040 tons every
year in between. (Assume 11 years of mining operations.) The land
will have a salvage value of $42,600.
The company builds necessary structures and sheds...
I know how to solve normal 1/2 life equations but this one is
confusing me! Please help me get both parts.
I know the standard equations of
t(1/2) = ln(2) / k & At= A0 e ^ (-kt)
but those didn't work when i tried. i got stuck! thanks! :)
This question has multiple parts. Work all the parts to get the most points. Radioactive cobalt-60 is used extensively in nuclear medicine as a γ-ray source. It is made by...
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