2012年10月17日

外部被ばく

ICRP 74, ICRP 116 より抜粋
16

ICRP Publication 74:
Conversion Coefficients for use in Radiological Protection against External Radiation. (http://www.icrp.org/publication.asp?id=ICRP Publication 74)

ICRP Publication 116
Conversion Coefficients for Radiological Protection Quantities for External Radiation Exposures
(http://www.icrp.org/publication.asp?id=ICRP Publication 116)

ICRP 116 (7)
Two sets of quantities are of importance in radiological protection:
(1) protection quantities (e.g. equivalent dose and effective dose)
(2) operational quantities (e.g. ambient dose equivalent and personal dose equivalent, defined for use as measurable surrogates of the protection quantities).

ICRP 116 (8)
The three principal protection quantities remain
(1) the mean absorbed dose in an organ or tissue, DT;
(2) the equivalent dose in an organ or tissue, HT;
(3) the effective dose, E.

ICRP 116 (8)
To form a bridge between the protection quantities and the radiation field, ICRU has developed operational quantities for measurement of exposures to external radiations.

ICRP 116 (9)
The operational quantities are
(1) the ambient dose equivalent, H*(d);
(2) the directional dose equivalent, H'(d,X);
(3) the personal dose equivalent, Hp(d).

Seiichi Ushikubo @sushikubo

ICRP Publication 74: Fig.1. Relationship of quantities for radiological protection monitoring purposes. http://t.co/GwdB3L4c

2012-10-17 03:10:12
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CONVERSION COEFFICIENTS FOR EXTERNAL EXPOSURE

ICRP 116 (111)
The protection quantities ‘equivalent dose’ and ‘effective dose’ are not measurable and thus their values are determined using their relationship to physical radiation field quantities such as particle fluence or air kerma.

ICRP Publication 74 (ICRP, 1996) explored the relationship between the protection quantity ‘effective dose’ and the operational dose quantities for specific idealised irradiation exposure geometries. Most of the data for protection quantities used for the evaluation were calculated on the basis of stylised models of human anatomy.

Seiichi Ushikubo @sushikubo

ICRP Publication 74: Table A.17. Effective dose per unit air kerma free-in-air, E/Ka. http://t.co/tx3M3562

2012-10-17 03:19:27
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Seiichi Ushikubo @sushikubo

ICRP Publication 74: Table A.16. Thyroid absorbed dose per unit air kerma free-in-air, DT/Ka http://t.co/hTm82UVt

2012-10-17 03:20:59
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Seiichi Ushikubo @sushikubo

ICRP Publication 74: Table A.21. Conversion coefficient for the ambient dose equivalent, H*(10), http://t.co/hSV3mQAx

2012-10-17 03:22:14
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Seiichi Ushikubo @sushikubo

ICRP Publication 74: Table A.24. Conversion coefficients from air kerma free-in-air to Hp(10,0) http://t.co/NaTcxAkx

2012-10-17 03:24:12
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Seiichi Ushikubo @sushikubo

@myen ICRP 74, (144) ".. the ROT geometry is seen as an approximation to irradiation from a widely dispersed planar source, .."

2012-10-17 03:31:39
Seiichi Ushikubo @sushikubo

@myen ICRP 74: (144) "The ISO geometry would be approximated by a body suspended in a large cloud of radioactive gas."

2012-10-17 03:33:07

ICRP 116 (113)
The ICRP voxel-based reference phantoms representing Reference Male and Reference Female (ICRP, 2002) require new calculations of conversion coefficients for all radiations and irradiation geometries of interest to replace the existing ICRP/ICRU data sets (ICRP, 1996).

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