Absorbed Fractions for Multi-Region Models of the - IRPA
Absorbed Fractions for Multi-Region Models of the Kidneys in ICRP/ICRU Voxel Phantoms Sakae KINASE*, Masanori KIMURA, Shogo TAKAHARA and Toshimitsu HOMMA *2-4 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan Kidney dosimetry is indispensable in internal dose evaluations since the kidneys appear to represent
IRPA Statement on Reasonableness in Optimisation of Protection
IRPA’s view is that at small fractions of a dose limit, or significantly below reference levels, there should be no ‘a priori’ expectation of dose reduction measures or formal demonstration of ALARA However, it would still be reasonable to implement actions arising from stakeholder engagement
F A voXel - IPEN
Female specific absorbed fractions 1 0E-08 1 0E-07 1 0E-06 1 0E-05 1 0E-04 0 01 0 1 1 10 Photon Energy (MeV) S p e c i f i c a b s o r b e d f r a c t i o n (1 / g) ADAM AD M 4 MAXHOM MAX Source organ: Liver Stomach FIG 3a Male specific absorbed fractions
Exemption and Clearance
Roger Coates, IRPA President 1 Sumof fractions 1 2 - 2 e) Activitydistribution 2 - 5 CumulativeImpact (Range) 33 - 1125 Typical CumulativeImpact 100 - 1000
The Boice Report 5
in October 2016 and ICRP Publication 133, The IRPA Computational Framework for Internal Dose Assessment for Reference Adults: Specific Absorbed Fractions In conjunction with the CSRP, a symposium was held including an overview on each of the five ICRP committees and excellent summaries of Chinese issues in radiation protection Hopefully,
Organ dose measurement in x-ray CT and other diagnostic
Weight fractions for red bone marrow and bone minerals are listed in ICRP Publication 70 [16], the parts of which we used for the organ dose evaluation are shown in Table 2 In the present study since human torso phantom was used the data of weight fractions of red bone marrow and bone minerals in the positions of head,
UNIVERSITI MALAYSIA SABAH
Malaysia Sabah (UMS) Research funding in the form of IRPA 06-02-02-001BTK-ER-015(1) (UMS 95500-37 awarded to Prof Dr Mashitah M Yusoff) is also gratefully acknowledged Both of these funds have enabled me to complete this study without financial difficulty A very special thanks to the School of Food science & nutrition
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Region Models
of the Kidneys in ICRP/ICRU Voxel By Sakae KINASE* , Masanori KIMURA, Shogo TAKAHARA andToshimitsu
HOMMA JAPANJapan Atomic Energy Agency
* E mail: kinase.sakae@jaea.go.jpFor IRPA
13 in Glasgow
Presented on May 17
th , 2012Table of Contents
Outline of the kidney models in the
ICRP/ICRU
voxel phantoms and absorbed fraction (AF)Highlight data
Self irradiation AFs and cross irradiation AFs for photonsConclusions
Motivation
1.Our projects
To update kidney
dosimetry in internal dose evaluations2. Technical issues
The ICRP 2007 recommendations
The evolution of dose quantities using human models3. Improvements in this study
The ICRP/ICRU
voxel phantoms + Monte Carlo simulations Evaluation of absorbed fractions (AFs) for the KidneysAdult Reference Male
height:1.76m mass:73.0kg voxel size: 2.137 2.1378.0 mm
3 AdultRefernce
Female
height: 1.63m mass:60.0kg
voxel size: 1.775 1.7754.84 mm
3Presented in ICRP Publ.110
2009)Application of the kidneys of ICRP/ICRU
voxel phantomsAdult male
Adult female
ICRP/ICRU
voxel phantomsKidney model montage
ICRP/ICRU adult female
voxel phantomViolet
Cortex,
RedPelvis,
Yellowish green
Medulla
Corresponding to ICRP 2007 !
target (brain) source (kidneys) e.g. MIRD 5 type phantom AF: the fraction of energy emitted as a specified radiation type in a source region, which is absorbed in a target tissueAFs are essential for internal
effective dose evaluationsAF = øi(rTĸS)i(rTĸS
øi(rTĸS) depend on
the type and energy of the radiation, the size, shape, composition of tissue, the distance between rT and rS, and the composition of the intervening tissue.AF evaluations
for ICRP/ICRU voxel phantomsAbsorbed fraction (AF)
Cross irradiation AFsKidney models
ICRP/ICRU adult male and female
voxel phantomsSource distribution
Uniformly distributed in the
muti region kidney cortex, medulla and pelvis mono energetic photons in 10keV 10MeVSimulation code
EGS4 UCSAF Cross section dataElectron:ICRU
37Photon:PHOTX
Statistical uncertainties
FSD within 5%
Monte Carlo simulations
Self irradiation AFs (1)MIRD kidney model*
Cortex
Pelvis
*From MIRD Pamphlet 1910-210-1100101
10-2 10-1 100AFs
Photon Energy (MeV)
Cortex 卬 Cortex
Self irradiation AFs (2) 10-3 10-2 10-1 100101