Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Question
Chapter 13, Problem 13.20P
To determine
The atmospheric DAC for the total activity that must be applied during cleanup of the contamination.
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If a vial contains 600 MBq of iodine-123 (I-123) at 12:30 (14 June 2019), how much radioactivity will be present in the vial at 14:00 on the 15 June 2019. Please input your answer in Bq and Ci.
A vial contains 2000 MBq of Technetium-99m on the 18th June 2014 at 06:00. How much will it contain at 07:00 on the 19th June 2014? Please input your answer in Bq and Ci.
Consider the region close to a nuclear reactor that produces large fluxes of
prompt gamma rays with energies of about 7 MeV. Use the graph below, showing
the mass attenuation coefficient of gamma rays in different stopping media as a
function of energy, to determine the approximate thickness of lead shielding
which would be required to reduce the gamma flux by a factor of 101º. The
density of lead is 11.3 g cm.
10
5
Pb
0.5
0.1
Pb
0.05
Cu
AL
0.01
0.01
0.05 0.1
0.5
1
5
10
50 100
Energy (MeV)
Attenuation coefficient (cm²g")
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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_forward2. A vial contains 1900 MBq of Technetium-99m on the 18th June 2014 at 06:00. How much will it contain at 07:00 on the 19th June 2014? Please input your answer in Bq and Ci. Note :- When a vial contains 1900 MBq of Technetium- 99m. Kindly give the correct answer.arrow_forwardPROBLEMS 1. If a vial contains 400 MBq of fluorine-18 (F-18) at 12:00 on 20 March 2019, how much radioactivity will be present in the vial at 14:00 on 20 March 2019? Please input your answer in Bq and Ci.arrow_forward
- If we had a radioactive waste giving off 5 MeV of gamma radiation, how thick would the following substances need to be to reduce the radiation by 99%. Calculate for air, concrete, water, and lead.arrow_forwardCalculate the primary pumping power under steady-state operating conditions for a typical pressurized water reactor-coolant system using only the following conditions: Core power = 3411 MWth delta Tcore = 33.7 Celsius T_IN= 293 Celsius p = 15.5 MPa Reactor-coolant system pressure drop = 778 kPa Pump efficiency = 85% Answer=22.9 MWearrow_forwardAn anisotropic point source emits 1010 γ-rays/sec with an energy of 1 MeV. The source is surrounded by a lead shield 10 cm thick. Calculate at the surface of the shield: a) the flux in the absence of the shield b) the uncoiled flux c) the buildup flux d) the exposure rate in the absence of the shield e) the exposure rate without the buildup of scattered radiation f) the exposure rate with builduparrow_forward
- CSDA range Determine the expected range of 2 MeV beta radiation in polyethylene, Aluminium and air. Use the ESTAR database on the NIST website to find the CSDA ranges (to 4 significant figures): R(px) for polyethylene = 9.375E-01 ✓g/cm² R(px) for Al= 1.224E+00 ✓ g/cm² R(px) for air- 1.094E+00 x g/cm² Looking at the 3 values you have found, the statement in the lab notes that the range is 'inversely proportional to the density p of the material and not dependent on its structure or any other properties' is a useful rough approximation because the px values are similar even if not exactly the same The values given are density times thickness (px). To find the actual range (x) we just divide by the density.arrow_forward1. Consider the following data from the analysis of mercury using cold vapor atomic absorption spectrometry: Concentration (ppm) 10.0 1.00 0.000 No. of replicate 15 15 20 measurements Mean of S 9.95 1.15 0.0124 Standard deviation of 0.12 0.030 0.0075 the measurement, s The calibration data yielded the following equation: S= 1.09CHE + 0.298 Where CHg is the concentration in ppm of Hg and S is the relative intensity of the emission line of Hg. Calculate for the following: a. Calibration sensitivity b. Analytical sensitivity at 10.0 and 1.00 ppm of Hg; and С. Detection limitarrow_forwardQ. 8: K.E. per unit volume is given by 3 2 (a) E=P (b) E=3 3 (c) E = mv² (d) None of these (CET-2003)arrow_forward
- A radioactive contaminant gives an unfortunate 0.5 kg lab rat a dose of 1500 rem in just 1 minute. Assuming that the half life of the radioactive isotope in the contaminant is much longer than1 minute, what would the activity (in Bq) of the contaminant be if the contaminant is a 1.1MeV beta emitter?arrow_forwardQ_ A person's hand receives a radiation dose at a rate of 50mSvh-1 at a distance of 1cm from a source. What would the dose rate be if the person's hand is 18cm from source?arrow_forward✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVarrow_forward
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