Comparison
Comparison close

BIPM.RI(I)-K5, EURAMET.RI(I)-K5.1 and APMP.RI(I)-K5

 

MEASURAND       Air kerma

Radiation quality    Cs-137 beam

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2) expressed in mGy/Gy

Air Kerma
Di  (mGy/Gy)
Participating institutes
Comparison
Comparison close

BIPM.RI(I)-K5, EURAMET.RI(I)-K5.1 and APMP.RI(I)-K5

 

MEASURAND       Air kerma

Radiation quality    Cs-137 beam

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2) expressed in mGy/Gy

LABi Di Uneg,i Upos,i
mGy/Gy
mGy/Gy
mGy/Gy
GUM -0.5 5.8
IST/ITN 1.3 4.2
LNE-LNHB -1.6 5.2
MKEH 5.3 5.0
VNIIM 1.3 5.4
KRISS -1.4 4.4
NIST -1.0 7.0
NMIJ -2.3 5.2
PTB 2.4 5.4
NIM -3.3 4.2
ININ 4.8 4.0
VSL -4.8 7.6
SMU 5.1 5.4
BEV 4.3 5.4
CIEMAT -0.8 4.4
INER -4.6 8.9
VINS -3.3 20.2
Participating institutes
BIPM.RI(I)-K5
APMP.RI(I)-K5
EURAMET.RI(I)-K5.1
APMP.RI(I)-K5
Metrology area, Sub-field Ionizing Radiation, Section I (x and gamma rays, electrons)
Description Comparison of therapy level Cs-137 air kerma rates
Time of measurements 2013 - 2014
Status Approved for equivalence
Final Reports of the comparisons
References

APMP.RI(I)-K5 Technical Protocol

Measurand Air kerma rates, mGy/s, in a range from 0.1 mGy/s to 1.1 mGy/s
Parameters Radiation type: Cs-137
Beam size diameter: 10 cm or 20 cm
Transfer device Two transfer chambers
Comparison type Key Comparison
Consultative Committee CCRI (Consultative Committee for Ionizing Radiation)
Conducted by APMP (Asia Pacific Metrology Programme)
Pilot institute KRISS
Korea Research Institute of Standards and Science
Korea, Republic of
Contact person Chul-Young Yi

+82 42 868 5370
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

CIEMAT

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Spain, EURAMET

NIM

National Institute of Metrology, China, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NRSL/INER

Institute of Nuclear Energy Research, Chinese Taipei, APMP

Comparison
Comparison close

BIPM.RI(I)-K5, EURAMET.RI(I)-K5.1 and APMP.RI(I)-K5

 

MEASURAND       Air kerma

Radiation quality    Cs-137 beam

 

The key comparison reference value is the BIPM evaluation of absrobed dose to water.

 

BIPM.RI(I)-K5

The degree of equivalence of each laboratory i with respect to the key comparison reference value is given by a pair of terms both expressed in mGy/Gy:
the relative difference Di and Ui, its expanded uncertainty (k = 2), with Ui = 2ui.

When required, the degree of equivalence between two laboratories i and j can be evaluated by a pair of terms both expressed in mGy/Gy:

Dij = Di - Dj  and Uij  , its expanded uncertainty (k = 2). The approximation for Uij is explained in section 5 of the Final Report.

 

Linking  EURAMET.RI(I)-K5.1 to BIPM.RI(I)-K5

The linking of EURAMET.RI(I)-K5.1 to BIPM.RI(I)-K5 is made via BEV (Austria) who participated in both comparisons.

 

Linking  APMP.RI(I)-K5 to BIPM.RI(I)-K5

The linking of APMP.RI(I)-K5 to BIPM.RI(I)-K5 is made via KRISS (Korea) and NMIJ AIST (Japan) who participated in both comparisons.

Comparison
Comparison close

BIPM.RI(I)-K5, EURAMET.RI(I)-K5.1 and APMP.RI(I)-K5

 

MEASURAND       Air kerma

Radiation quality    Cs-137 beam

 

xi     ratio of the measurement of laboratory i to that of the BIPM

ui     combined standard uncertainty of the ratio xi

 

BIPM.RI(I)-K5

  Labi xi ui year of measurement
  GUM 0.9995 0.0029 2006
  IST/ITN 1.0013 0.0021 2008
  LNE-LNHB 0.9984 0.0026 2008
  MKEH 1.0053 0.0025 2009
  VNIIM 1.0013 0.0027 2009
  KRISS 0.9986 0.0022 2010
  NIST 0.9990 0.0035 2011
  NMIJ 0.9977 0.0026 2012
  PTB 1.0024 0.0027 2014
  NIM 0.9967 0.0021 2014
  ININ 1.0048 0.0020 2015
  VSL 0.9952 0.0038 2016
  SMU 1.0051 0.0027 2017
  BEV 1.0043 0.0027 2023
  CIEMAT 0.9992 0.0022 2023

 

EURAMET.RI(I)-K5.1

  Labi xi ui year of measurement
  VINS 0.9967 0.0101 2017

 

APMP.RI(I)-K5

  Labi xi ui year of measurement
  KRISS 0.9931 0.0041 2014
  NMIJ 1.0033 0.0043 2014
  INER 0.9954 0.0045 2014
  CIEMAT 1.0042 0.0086 2014
  NIM 1.0013 0.0044 2014