Homework Help is Here – Start Your Trial Now!
Science
Chemistry
A. A cobalt-60 source with activity 2.60x104 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? ii. What absorbed dose, in rad, is delivered per second? iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is 0.70? Page 5 of 7 iv. What exposure time is required for an equivalent dose of 200 rem? B. A laser with power output of 2.0 mW at a wavelength of 400 nm is projected onto a Calcium metal. The binding energy is 2.31 eV. i. How many electrons per second are ejected? ii. What power is carried away by the electrons? C. A hypodermic needle of diameter 1.19 mm and length 50 mm is used to withdraw blood from a patient? How long would it take for 500 ml of blood to be taken? Assume a blood viscosity of 0.0027 Pa.s and a pressure in the vein of 1,900 Pa. D. A person with lymphoma receives a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. i. How much energy is absorbed by the cancerous tissue? If this treatment consists of five 15-minute sessions per week over the course of 5 weeks and just one percent of the gamma photons in the gamma ray beam are absorbed, what is the power of the gamma ray beam? ii. If the gamma ray beam consists of just 0.5 percent of the photons emitted by the gamma source, each of which has an energy of 0.03 MeV, what is the activity, in Curies, of the gamma ray source? ii. E. A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250 ml of water from room temperature of 25°C to boiling point in 45.0 secs. What is the resistance of the heater? The density of water is 1,000 kg/m? and the specific heat capacity of water is 4,200 J/kg/°C.

A. A cobalt-60 source with activity 2.60x104 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? ii. What absorbed dose, in rad, is delivered per second? iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is 0.70? Page 5 of 7 iv. What exposure time is required for an equivalent dose of 200 rem? B. A laser with power output of 2.0 mW at a wavelength of 400 nm is projected onto a Calcium metal. The binding energy is 2.31 eV. i. How many electrons per second are ejected? ii. What power is carried away by the electrons? C. A hypodermic needle of diameter 1.19 mm and length 50 mm is used to withdraw blood from a patient? How long would it take for 500 ml of blood to be taken? Assume a blood viscosity of 0.0027 Pa.s and a pressure in the vein of 1,900 Pa. D. A person with lymphoma receives a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. i. How much energy is absorbed by the cancerous tissue? If this treatment consists of five 15-minute sessions per week over the course of 5 weeks and just one percent of the gamma photons in the gamma ray beam are absorbed, what is the power of the gamma ray beam? ii. If the gamma ray beam consists of just 0.5 percent of the photons emitted by the gamma source, each of which has an energy of 0.03 MeV, what is the activity, in Curies, of the gamma ray source? ii. E. A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250 ml of water from room temperature of 25°C to boiling point in 45.0 secs. What is the resistance of the heater? The density of water is 1,000 kg/m? and the specific heat capacity of water is 4,200 J/kg/°C.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
See similar textbooks
icon
Related questions
Question
A. A cobalt-60 source with activity 2.60x104 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? ii. What absorbed dose, in rad, is delivered per second? iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is 0.70? Page 5 of 7 iv. What exposure time is required for an equivalent dose of 200 rem? B. A laser with power output of 2.0 mW at a wavelength of 400 nm is projected onto a Calcium metal. The binding energy is 2.31 eV. i. How many electrons per second are ejected? ii. What power is carried away by the electrons? C. A hypodermic needle of diameter 1.19 mm and length 50 mm is used to withdraw blood from a patient? How long would it take for 500 ml of blood to be taken? Assume a blood viscosity of 0.0027 Pa.s and a pressure in the vein of 1,900 Pa. D. A person with lymphoma receives a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. i. How much energy is absorbed by the cancerous tissue? If this treatment consists of five 15-minute sessions per week over the course of 5 weeks and just one percent of the gamma photons in the gamma ray beam are absorbed, what is the power of the gamma ray beam? ii. If the gamma ray beam consists of just 0.5 percent of the photons emitted by the gamma source, each of which has an energy of 0.03 MeV, what is the activity, in Curies, of the gamma ray source? ii. E. A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250 ml of water from room temperature of 25°C to boiling point in 45.0 secs. What is the resistance of the heater? The density of water is 1,000 kg/m? and the specific heat capacity of water is 4,200 J/kg/°C.
Transcribed Image Text:A. A cobalt-60 source with activity 2.60x104 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? ii. What absorbed dose, in rad, is delivered per second? iii. What equivalent dose, in rem, is delivered per second if the RBE for these gamma rays is 0.70? Page 5 of 7 iv. What exposure time is required for an equivalent dose of 200 rem? B. A laser with power output of 2.0 mW at a wavelength of 400 nm is projected onto a Calcium metal. The binding energy is 2.31 eV. i. How many electrons per second are ejected? ii. What power is carried away by the electrons? C. A hypodermic needle of diameter 1.19 mm and length 50 mm is used to withdraw blood from a patient? How long would it take for 500 ml of blood to be taken? Assume a blood viscosity of 0.0027 Pa.s and a pressure in the vein of 1,900 Pa. D. A person with lymphoma receives a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. i. How much energy is absorbed by the cancerous tissue? If this treatment consists of five 15-minute sessions per week over the course of 5 weeks and just one percent of the gamma photons in the gamma ray beam are absorbed, what is the power of the gamma ray beam? ii. If the gamma ray beam consists of just 0.5 percent of the photons emitted by the gamma source, each of which has an energy of 0.03 MeV, what is the activity, in Curies, of the gamma ray source? ii. E. A water heater that is connected across the terminals of a 15.0 V power supply is able to heat 250 ml of water from room temperature of 25°C to boiling point in 45.0 secs. What is the resistance of the heater? The density of water is 1,000 kg/m? and the specific heat capacity of water is 4,200 J/kg/°C.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 4 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS