Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 13, Problem 13.25P
To determine
The areal concentration on the floor, tpm, per 100 cm2.
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- 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_forwardData from the appendices and the periodic table may be needed for these problems. Show that the activity of the 14C in 1.00 g of 12C found in living tissue is 0.250 Bq.arrow_forward
- Control rods are usually made of an alloy of indium. The absorption cross-section of indium for thermal neutron is 71 b, and the mass density of solid indium is 7.31 g cm-3. Estimate the neutron transmission ratio of a 1-cm thick indium slab. (a) 0.07 (b)0.7 (c) 0.01 (d) 0.1arrow_forwardIodine-131 is a beta-emitter, which decay by the first-order rate law with a half-life of 8.0 days. What is the activity in cps (counts per second) of 25.0 ng (2.5 x 10–8 g) sample of 131I (atomic mass = 131 g/mol)? (Avogadro’s #, NA = 6.02 x 1023/mol) (A) 1.2 x 108 cps (B) 1.5 x 1010 cps (C) 1.0 x 1011 cps (D) 4.1 x 1011 cpsarrow_forwardWhat is the mass of 60 Co in a cancer therapy transillumination unit containing 5.00 kCi of 60 Co ?arrow_forward
- A radiation worker stands 35 cm away from a radioactive source of 30 mCi (11.1 GBq) 99mTc(?? for 99mTc is 0.80 R·cm2/mCi·hr at 1 cm or 18.0 μGy·m2/ GBq·hr at 1 m). Calculate the exposurevalue received by the worker while standing for 1 hr near the source. The isotop half-life is 6 hours.arrow_forwardThe radionuclide 32P (T1/2 = 14.28 d) is often used as a tracer to follow the course of biochemical reactions involving phosphorus. (a) If the counting rate in a particular experimental setup is initially 3050 counts/s, how much time will the rate take to fall to 170 counts/s? (b) A solution containing 32P is fed to the root system of an experimental tomato plant, and the 32P activity in a leaf is measured 3.48 days later. By what factor must this reading be multiplied to correct for the decay that has occurred since the experiment began?arrow_forwardDuring 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 Dmaxarrow_forward
- The Q-value of a reaction is the amount of energy released during the reaction. It is stated thatin step 1 of the PPI thermonuclear reaction chain,1H +1H → 2H + e+ + ν,1.44 MeV energy is released; then in step 2: 2H + 1H → 3He + γ and step 3,3He + 3He → 4He + 1H + 1H, 5.5 MeV and 12.8 MeV are released, respectively. Prove byappropriate calculation that the above quoted Q-values in MeV are true. The relevant masses:hydrogen 1.00782503214, helium-4 4.002603, positron 0.00054857991, deuterium 2.0141 andhelium-3 3.0160 are all quoted in the atomic units of mass which is 1.6605387 × 10−27 kg. Ignorethe neutrino contribution.arrow_forwardChromium-51 is used in imaging red blood cells and has an effective half-life of 27 days. If a dose with an activity of 24 μCiμCi is given to a patient, how long will it take for the patient to have less than 3 μCiμCi present?arrow_forward
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