Calculation of atomic radiations in nuclear decay – BrIccEmis and beyond T. Kibèdi, B.Q. Lee, A.E. Stuchbery, K.A. Robinson in collaboration with F.G. Kondev (ANL) Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
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Calculation of atomic radiations in
nuclear decay – BrIccEmis and beyond
T. Kibèdi, B.Q. Lee, A.E. Stuchbery, K.A. Robinson
in collaboration with F.G. Kondev (ANL)
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Outline
Talk is largely based on
Kȧlmȧn Robertson (ANU) Honours project (2010)
Boon Quan Lee (ANU) Honours project (2012)
2012Le09 Lee et al.,
“Atomic Radiations in the Decay of Medical Radioisotopes: A Physics Perspective”
Computational and Mathematical Methods in Medicine
Volume 2012, Article ID 651475, doi:10.1155/2012/651475
2011 NSDD meeting (IAEA)
Radiative and Non-radiative atomic transitions in nuclear decay
Nuclear and atomic data
Existing programs to evaluate atomic radiations
New model based on Monte Carlo approach
Future directions
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic radiations - Basic concept
1S
2S
2P
3S
3P
3D
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy
Vacancies on the inner-shell can be
produced by
electron impact
photo ionization
ion-atom collision
internal conversion
electron capture
secondary processes accompanying
b-decay or electron capture
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic radiations - Basic concept
1S
2S
2P
3S
3P
3D
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy
X-ray emission
Ka2 X-ray
1 secondary vacancy
22 LKX EEEK
a
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic radiations - Basic concept
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy 1S
2S
2P
3S
3P
3D
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy
X-ray emission
Ka2 X-ray
1 secondary vacancy
22 LKX EEEK
a
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic radiations - Basic concept
K
L1
L2
L3
M1
M2
M3
M4
M5
Auger-electron
2
3232
L
LLKLLK EEEE
K L2 L3 Auger-electron
2 new secondary vacancies
1S
2S
2P
3S
3P
3D
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy
X-ray emission
Initial vacancy
Ka2 X-ray
1 secondary vacancy
22 LKX EEEK
a
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic radiations - Basic concept
K
L1
L2
L3
M1
M2
M3
M4
M5
Coster-Kronig electron
2
121121
L
MLLMLL EEEE
L1 L2 M1 Coster-Kronig transition
2 new secondary vacancies
1S
2S
2P
3S
3P
3D
K
L1
L2
L3
M1
M2
M3
M4
M5
Initial vacancy
X-ray emission
Initial vacancy
22 LKX EEEK
a
Ka2 X-ray
1 secondary vacancy
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Atomic relaxation and vacancy transfer
K
L1
L2
L3
M1
M2
M3
M4,5
N1
N2,3
N4,5
O1,2,3
A vacancy cascade in Xe From M.O. Krause, J. Phys. Colloques, 32 (1971) C4-67
X
A A
A A A
KC
A A
A A
A A A A Full relaxation of an initial inner shell
vacancy creates vacancy cascade
involving X-ray (Radiative) and Auger as
well as Coster-Kronig (Non-Radiative)
transitions
Many possible cascades for a single
initial vacancy
Typical relaxation time ~10-15 seconds
Many vacancy cascades following a
single ionisation event!
Initial vacancy
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Transition energies and Rates
Auger-electron X-ray emission
Number of primary
vacancies
For a single initial vacancy on the K-shell following nuclear decay
T
KK Pn
a
a
1Internal conversion
Electron capture KK PPn
Energy YKX EEEKY
X
YXKKXY EEEE
Intensity KKX nIKY
KKKXY anI 1 KK a
for L1 shell )( 312111 LLLLLKXYL ffanI
1312111 LLLLLL ffa
111 LLX nIYL
in an ion
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Medical applications - Auger electrons
Kassis, Int. J. of Radiation Biology, 80 (2004) 789
electrons
Biological effect:
Linear energy transfer LET, keV/mm
Tibor Kibèdi, Dep. of Nuclear Physics, Australian National University DDEP Workshop, Paris, 8-10 October 2012
Medical applications - Auger electrons
2011 August, INDC International Nuclear Data Committee
Technical Meeting on Intermediate-term Nuclear Data Needs for Medical Applications:
Cross Sections and Decay Data Edited by A.L. Nichols, et al.,