Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 13, Problem 13.6P
To determine
The ratio of concentration of soluble
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
In a Ussing chamber with Gramicidin channels inserted in the separating membrane.The left side has radioactively labeled K+ ions the right side has unlabeled ions K+, in equal concentrations (c1=c2). Measurements conducted at +20 mV show that the radioactive flux is 10 times higher than the non-radioactive flux in the opposite direction. What is the mean occupancy of the channel by potassium, i.e. number of ions in the barrel?
✓
ON
"O
2.75 MeV
0.511 MeV
0.511 MeV
B, E= 1.73 MeV
Eave = 0.721 Mev
O MeV
During a routine Radiation Therapy procedure of Mr. X, the radiation dose at particular points at the trajectory of the beam towards the lesion is as follows 1. 15 MV 2. 10 MV 3. 8 MV 4. 6 MV 5. 5MV 6. 3 Mv 7. 2MV 8. 1 MV with the reference dose being the 5th, compute for the PDD of the beam at all points of the beam preceding the Dmax
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Calculate the dose in Sv to the chest at a patient given an xray under the following conditions. The xray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2 35.0% of the xrays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.arrow_forwardWhat is the dose in mSv for: (a) a 0.1 Gy xray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5 mGy of exposure?arrow_forwardThe (effective) dose to a patient can be measured in milli-Serverts (mSv) or expressed as the time taken to receive the equivalent dose from background radiation. A certain radiograph gives a 1.232 mSv dose which is equivalent to a background radiation dose of 32 weeks.a)How many days in 32 weeks? Give your answer as a whole number. b)Using the information for the radiograph in this question, calculate the UK daily background dose (in mSv/day). Give your answer to 5 decimal places and use it to this accuracy, if needed in subsequent calculations. c)Another radiograph has a 0.0054 mSv dose. Work out the equivalent background dose (in days) for this radiograph. Give your answer to 2 decimal places and use it to this accuracy in any subsequent calculations. d)How many hours is the number of days in part c) equivalent to? Give your answer to 2 decimal places.arrow_forward
- for a ussing chamber, the left side has radioactively labeled K+ ions ,the right side has unlabeled ions K+, in equal concentrations (c1=c2). Measurements conducted at +20 mV show that the radioactive flux is 10 times higher than the non-radioactive flux in the opposite direction. What is the mean occupancy of the channel by potassium, i.e. number of ions in the barrel?arrow_forwardA beam of 5.0 MeV alpha particles (q-2e) has a cross-sectional area of 1.50 cm2. It is incident on flesh (p-950 kg/m³) and penetrates to a depth of 0.70 mm. a) What dose in Gy does the beam provide to the flesh in a time of 3.0 s? b) What effective dose does it provide? Assume the beam to carry a current of 2.50 x 109 A and to have QF - 14.arrow_forwardA particular radioactive source produces 100 mrad of 2-MeV gamma rays per hour at a distance of 1.0 m. (a) How long could a person stand at this distance before accumulating an intolerable dose of 1 rem? (b) Assuming the gamma radiation is emitted uniformly in all directions, at what distance would a person recieve a dose of 10 mrad/h from this source? dont provode hand written solutionarrow_forward
- A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage of 131I will still be in the patient's thyroid after 72.9 days? (Let N0 and Nf represent the initial dose and the amount left after 72.9 days, respectively. Enter your answer as a fraction.)arrow_forwardA radiographic technique calls for 46 kVp and 28 mAs which results in an exposure of 278 µGy. What is the expected exposure if the technique is changed to 75 kVp and 14 mAs? Round your answer to the nearest whole number. Do not include units.arrow_forwardA worker will need to conduct a repair to a pipe containing radioactive waste. The pipe is 10 m long, and the worker will need to be standing 50 cm from the pipe. A remote detector was used to take a reading of 1.5 R/hr at 3 m from the pipe. a) What is the dose rate at the work position? b) If the worker's dose limit is 30 rad, how long will he have to complete the work? Assume that there is no dose from approaching and leaving the work location.arrow_forward
- (Internal Exposure: Internal Radiation Dose) Given a 20µCi of 32p (T/2 = 14.3 days) is delivered intravenously of a reference adult (70 kg). The biological half-life throughout the body is 19 days. Calculate: a. the absorbed dose constant (express your answer in erg/g t and Gy/t) for P-32 irradiating the whole body uniformly b. total number of transformations that occur in the total body as a source organ; assume that P-32 is metabolized wherein 40% is uniformly distributed to the whole body thus the initial activity distributed in the total body is q, = 0.40 × 20µCi = 8µCi c. the total body dose. where t refers to the transformation number. Note: 1 Joule = 107ergarrow_forwardPlease provide Handwritten answer. Two 13.3 mg radium tubes are arranged in a line with their centers 5.5 cm apart. A weaker source is placed midway between them. How much radium should be in this latter source to produce the same dose rates to points opposite each of the sources at a distance of 2.0 cm away from the line. Assume sources 1.35 cm active length 1.0 mm Pt.arrow_forwardA radioactive isotope with a concentration of 001.0 MCHL requires 8.61 days to decompose to the permissible concentration in a network. Sanitation of 00005.0 microcuries in milliliters. What is this radioactive isotope.And what is the final focus? After a yeararrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College