BIPM.RI(I)-K8 and APMP.RI(I)-K8

MEASURAND       Air kerma

SOURCE                     HDR Ir-192 brachytherapy sources

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.

Air kerma
Di  (mGy/Gy)
Participating institutes

a) results obtained using a thimble-type chamber

b) results obtained using a well-type chamber

BIPM.RI(I)-K8 and APMP.RI(I)-K8

MEASURAND       Air kerma

SOURCE                     HDR Ir-192 brachytherapy sources

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mGy/Gy.

LABi Di Uneg,i Upos,i
mGy/Gy
mGy/Gy
mGy/Gy
VSL (a) -12.7 12.2
NPL (a) -1.1 11.4
PTB (a) 0.3 19.8
NRC (a) -3.4 10.0
NMIJ (b) 3.6 10.8
IAEA 9.4 30.5
INER 10.1 19.6
KRISS 4.2 16.4
NMISA 7.3 30.5
Nuclear Malaysia -6.4 30.8
PTKMR-BATAN 40.8 34.3
Participating institutes
BIPM.RI(I)-K8
APMP.RI(I)-K8

a) results obtained using a thimble-type chamber

b) results obtained using a well-type chamber

Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.RI(I)-K8
Metrology area, Sub-field Ionizing Radiation, Section I (x and gamma rays, electrons)
Description Measurement of reference air kerma rate for HDR Ir-192 brachytherapy sources
Time of measurements 2009 -
Status Continuous, approved for equivalence
References

BIPM.RI(I)-K8 Technical protocol

Measurand Reference air kerma rate (in mGy/h) relative to the BIPM evaluation
Parameters Radiation type: HDR Ir-192 sealed brachytherapy sources
Transfer device BIPM ionization chambers: well-type and thimble-type
Comparison type Key Comparison
Consultative Committee CCRI (Consultative Committee for Ionizing Radiation)
Conducted by BIPM (Bureau International des Poids et Mesures)
Comments The Final Report for each bi-lateral comparsion is listed in the tab "Participants"
First results published on 13 September 2014
Most recent update: 20 October 2021
Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person C. Kessler

+33 (0) 1 45 07 70 84
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

VSL

VSL, Netherlands, EURAMET

BIPM.RI(I)-K8 and APMP.RI(I)-K8

MEASURAND       Air kerma

SOURCE                     HDR Ir-192 brachytherapy sources

 

The key comparison reference value is the BIPM evaluation of reference air kerma rate.

 

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

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).

 

Linking APMP.RI(I)-K8 to BIPM.RI(I)-K8

The INSTITUTE provides the link between the key comparison COMPARISON IDENTIFIER and COMPARISON IDENTIFIER, having participated in both comparisons. The linking process is described in Section X of the COMPARISON IDENTIFIER Final Report.

BIPM.RI(I)-K8 and APMP.RI(I)-K8

MEASURAND       Air kerma

SOURCE                     HDR Ir-192 brachytherapy sources

 

xi   measurement result obtained by laboratory i relative to the KCRV

ui   combined standard uncertainty of xi

 

BIPM.RI(I)-K8

 

APMP.RI(I)-K8