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    Five Radioactivity and Nuclear Chemistry Questions

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    1- An injection containing 10.0pg 10 5 B was injected into a patient suffering from a brain tumor. The patient was irradiated by a neutron gun at the site of the tumor. Calculate the amount of energy released in megaelectronvolts given that 931 MeV is released for each 1 amu mass defect. To calculate the energy released, consider the isotopic masses as follows:

    Element or particle = Isotopic mass (amu):
    10 / 5 B = 10.0129
    neutron= 1.0086
    7 3 Li = 7.0160
    alpha particle = 4.0026

    Express your answer in megaelectronvolts to three significant figures.

    2- Calculate the mass defect of the fluorine nucleus 19 /9 F. The mass of neutral 19 / 9 F is equal to 18.998403 atomic mass units. Express your answer in atomic mass units to four significant figures and u units

    3- Calculate the binding energy E/ B of the fluorine nucleus 19 / 9 F .Express your answer in millions of electron volts to four significant figures and MeV units.

    4-Calculate the binding energy per nucleon of the fluorine nucleus 19/ 9 F .Express your answer in millions of electron volts to four significant figures and MeV / nucleon units.

    5- Calculate the mass defect of the helium nucleus 4 /2 He. The mass of neutral 4 /2 He is given by M/ He =4.002603u .Express your answer in atomic mass units to four significant figures and in u units.

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    https://brainmass.com/chemistry/general-chemistry/radioactivity-nuclear-chemistry-questions-554774

    Solution Preview

    1. 10/5 B + 1/0 n ----> 4/2 He + γ + 7/3 Li

    Mass defect = (4.0026 + 1.0086 + 7.0160) - (10.0129) = 2.0143 amu

    Energy = 2.0143 amu x (931 MeV / 1 amu) = ...

    Solution Summary

    The solution assists with answering five radioactivity and nuclear chemistry questions.

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