Question

A point source of Co-60 gamma rays emits the same number of photons of 1.17 and...

A point source of Co-60 gamma rays emits the same number of photons of 1.17 and 1.33 MeV, with a total fluence rate of 5.7x109 photons cm-1 s -1 at a specified location. What is the energy fluence rate there, expressed in a) erg cm-2 s -1 ? b) J m-2 min-1 ?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

GIven E1 = 1.17 MeV = 1.17 x 1.602 x 10-6 erg = 1.874 x 10-6 erg = 1.874 x 10-13 J
E2 = 1.33 MeV = 1.33 x 1.602 x 10-6 erg = 2.13 x 10-6 erg = 2.13 x 10-13 J
Average value = E = 2.00 x 10-6? erg = 2.00 x 10-13? J
?Total fluence = = 5.7 x 109? photons / cm2 / s = 3.42 x 1015 photons / m2 / min
?Energy fluence rate = = E ? = 2.00 x 10-6? erg x 5.7 x 109? photons / cm2 / s = 11400 erg / cm2 / s
Energy fluence rate = = E ? = 2.00 x 10-13? J x 3.42 x 1015 photons / m2 / min = 684 J / m2 / min

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A cobalt-60 source with activity 2.60×10-4 Ci is embedded in a tumor that has mas 0.20...
A cobalt-60 source with activity 2.60×10-4 Ci is embedded in a tumor that has mas 0.20 kg. The source emits gamma photons with average energy 1.25 MeV. Half the photons are absorbed in the tumor, and half escape. i. What energy is delivered to the tumor per second? [4 marks] ii. What absorbed dose, in rad, is delivered per second? [2 marks] iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is...
A point source that emits beta particles at a rate of 107/s is to be shielded....
A point source that emits beta particles at a rate of 107/s is to be shielded. If the max beta energy is 3.0 MeV, what thickness of aluminum would be required to attenuate the beta particles, and what thickness of lead would need to be included to reduce the photon flux at 50 cm by a factor of 1000?
Given: 1eV=1.6×10-19 Joules, 1Ci=3,7×1010 des/s. A 2 mCi of 60Co source emits two gamma rays per...
Given: 1eV=1.6×10-19 Joules, 1Ci=3,7×1010 des/s. A 2 mCi of 60Co source emits two gamma rays per disintegration with energies of E1=1172 and E2=1332 keV.  10% of gamma rays emitted from the source have been fully absorbed in a cube with a 10 cm side and a density of 2g/cm3. The mass of the cube is m=.V, where V is the volume of the cube. Do your calculation and circle the correct answer for: ⦁   The number of gammas per second, N,...
Given: 1eV=1.6×10-19 Joules, 1Ci=3,7×1010 des/s. A 2 mCi of 60Co source emits two gamma rays per...
Given: 1eV=1.6×10-19 Joules, 1Ci=3,7×1010 des/s. A 2 mCi of 60Co source emits two gamma rays per disintegration with energies of E1=1172 and E2=1332 keV. 10% of gamma rays emitted from the source have been fully absorbed in a cube with a 10 cm side and a density of r = 2g/cm3. The mass of the cube is m=r.V, where V is the volume of the cube. Do your calculation and circle the correct answer for: The number of gammas per...
a 60 Co y-ray source used in radiation therapy has an activity of 5*10^9 Bq. the...
a 60 Co y-ray source used in radiation therapy has an activity of 5*10^9 Bq. the half life if 69 Co id 5.36 years. a.) what is the mass if the 60 Co in the source? b) this source is used to deliver radiation to a .2 kg tumor. it is placed so that 50% of the radiation from the source is absorbed by the tumor. each decay delivers an average of 1.2MeV of energy. the treatment lasts for 10...
An electronic point source emits sound isotropically at a frequency of 3 × 10^3 Hz and...
An electronic point source emits sound isotropically at a frequency of 3 × 10^3 Hz and a power of 25 watts. A small microphone has an area of 0.72 cm^2 and is located 4.12 meters from the point source. The speed of sound is 343 m/s. What is the sound intensity at the microphone? What is the power intercepted by the microphone? What is the sound intensity level (in dB) at the microphone from this point source? What would be...
What thickness of lead shielding is needed around a 2000 Ci point source of Co-60 to...
What thickness of lead shielding is needed around a 2000 Ci point source of Co-60 to reduce the exposure rate to 10 mR/h at a distance of 2 m?
QUESTION 1 The term "Slip" indicates the difference between the motor's synchronous speed and the no-load...
QUESTION 1 The term "Slip" indicates the difference between the motor's synchronous speed and the no-load speed True False 1 points    QUESTION 2 Wet Bulb (WB) Temperature: is for the temperature reading form an ordinary mercury bulb thermometer or regular temperature sensor. True False 1 points    QUESTION 3 The refrigerant (R-134a) is the new replacement of the refrigerant (R-22) as it is less harmful to the environment. True False 1 points    QUESTION 4 Draft Gauge and Bourdon...
1. What is an ISP (Integrated Service Provider) for supply chains? (1 point) A. A consultant...
1. What is an ISP (Integrated Service Provider) for supply chains? (1 point) A. A consultant agency which integrates the supply chain for companies B. A 2 PL or a 3PL, but not a 4PL C. A company supplying transportation and warehousing services D. A logistics service company specialized in suppling VAS (value added services) 2. What characterizes a 4 PL? (1 point) A. They are non-asset based and provides integrated services primarily supplied by asset based providers, for example...
READ THE CASE STUDY AND ANSWER THE FOLLOWING QUESTIONS 2nd CASE: An Unexplained Death A 65-year-old...
READ THE CASE STUDY AND ANSWER THE FOLLOWING QUESTIONS 2nd CASE: An Unexplained Death A 65-year-old man of Scandinavian descent was rushed to the Emergency Room of your local hospital after a family member discovered him unconscious in his home. The woman who dialed “911” told the dispatcher that the man, her brother, was the local librarian of the past 10 years and had no spouse or children. She reported that they had spoken the day before, and he had...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT