HW13-10 - 7-6 Radiation Interactions Chap 7 A small...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
7-6 Radiation Interactions Chap. 7 9. A small homogeneous sample of mass m (g) with atomic mass A is irradiated uniformly by a constant flux density </J (cm-2 S-1). If the total atomic cross section for the sample material with the irradiating particles is denoted by at (cm2), derive an expression for the fraction of the atoms in the sample that interact during a I-h irradiation. State any assumptions made. Solution: The number of interactions that occur, during a time interval ~t, in the sample with atom density N, a volume ~ V, a mass density p, and an atomic weight A is Nint = iit~V~t = JLtc/J~V~t = (Nut)c/J(m/p)~t The number of atoms in the sample, Natorns = (mNa}/A. Hence the fraction of atoms in the sample that experience an interaction is no. interactions no. atoms Nint Natorns = O"tljJ~t. Fraction reacting = = 10. A 1-mCi source of 60Co is placed in the center of a cylindrical water-filled tank with an inside diameter of 20 cm and depth of 100 cm. The tank is make of
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern