Session I204 Internal Conversion

8/11/2019 Session I204 Internal Conversion

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4/2003 Rev 2 I.2.4 – slide 1 of 9

Session I.2.4

Part I Review of Fundamentals

Module 2 Basic Physics and Mathematics

Used in Radiation Protection

Session 4 Internal Conversion and AugerElectrons

IAEA Post Graduate Educational CourseRadiation Protection and Safe Use of Radiation Sources



4/2003 Rev 2 I.2.4 – slide 2 of 9

In this session we will discuss the process

of Internal Conversion

We will also discuss Auger Electrons

Overview



4/2003 Rev 2 I.2.4 – slide 3 of 9

Auger Electrons

Auger electrons are a special case of Internal

Conversion.

During the Internal Conversion Process, a gamma

photon from the nucleus interacts with and transfers

all of its energy to a tightly bound (K-shell) orbital

electron.

The electron is ejected from the atom withconsiderable energy, equal to that of the initial

gamma photon minus the binding energy.



4/2003 Rev 2 I.2.4 – slide 4 of 9

Auger Electrons

characteristic x-ray Auger electron





4/2003 Rev 2 I.2.4 – slide 6 of 9

Auger Electrons

BEK-shell = EceK - E

=

217.6 - 296 = -78.4 keV

BEL3-shell = EceL1 E

=

284.4 - 296 = -11.6 keV

NOTE: gamma, x-ray

and electron energies

are positive while

binding energies are

negative

K 1 characteristic x-ray =

-11.6 - -78.4 = 66.8 keV



4/2003 Rev 2 I.2.4 – slide 7 of 9

Auger Electrons

E

= 296 keV

EceL2 = 282.7 keV

BEL2 = EceL2 - E =282.7 – 296 = -13.3 keV

BEM = EceM - E

=

293.3 - 296 = -2.7 keV

characteristic x-ray (M L)

= BEM – BEL2

= -2.7 - -13.3 = 10.6 keV



4/2003 Rev 2 I.2.4 – slide 8 of 9

Auger Electrons

From previous slide:

BEM = -2.7 keV

characteristic x-ray (M L)= 10.6 keV

Auger electron ejected

from the M-shell= 10.6 – 2.7 = 7.9 keV

(close to 7.4 keV)



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Session I204 Internal Conversion