Revised correction factor for the UK national primary standard for air kerma for137Cs and60Co gamma-rays

The results of development of the national primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2011 in 2019 are presented according to the recommendations of the ICRU Report No. 90 “Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications”. The following changes are made to the equations for the units determination with the standard: in the field of X-rays, new correction coefficients of the free-air ionization chambers are introduced and the relative standard uncertainty of the average energy to create an ion pair in air is changed; in the field of gamma radiation, the product of the average energy to create an ion pair in air and the electron stopping-power graphite to air ratio for the cavity ionization chambers is changed. More accurate values of the units reproduced by GET 8-2019 are obtained and new metrological characteristics of the standard are stated.

Download Full-text

National primary standard of absorbed dose and absorbed dose rate of beta radiation in tissue-equivalent material GET 9–2018

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2019-7-3-9 ◽

2019 ◽

pp. 3-9

Author(s):

S. A. Fedina ◽

A.V. Oborin ◽

A.Y. Villevalde ◽

E.N. Rumyantseva ◽

S.G. Trofimchuk

Keyword(s):

Dose Rate ◽

Primary Standard ◽

Absorbed Dose ◽

Beta Radiation ◽

Equivalent Material ◽

Absorbed Dose Rate ◽

National Primary Standard ◽

Tissue Equivalent

Download Full-text

National primary standard machine of Shore D hardness scale for metals and Leeb hardness scales

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-2-6-10 ◽

2020 ◽

pp. 6-10

Author(s):

A.E. Aslanyan ◽

E.G. Aslanyan ◽

S.M. Gavrilkin ◽

A.S. Doynikov ◽

A.N. Shchipunov

Keyword(s):

Measurement Uncertainty ◽

Primary Standard ◽

Metrological Characteristics ◽

National Primary Standard ◽

Hardness Scale ◽

Leeb Hardness

The article presents the results of studies to improve the National primary standard machine for hardness of metals on the shore D scale GET 161-2001, which were performed in FSUE “VNIIFTRI” from 2016 to 2018 in accordance with the technical task of Rosstandart.The improvement was carried out in order to ensure the uniformity of hardness measurements on the Leeb scales. The created new parts of the primary standard machine, which are settings for reproducing hardness numbers on the Leeb scales, are considered. Metrological characteristics of the upgraded and adopted National primary standard machine (GET 161-2019) were investigated, the budget of measurement uncertainty was calculated for reproducing hardness numbers on the Leeb scales.

Download Full-text

New approach to maintaining liquid flow rate stability in national primary standard

Flow Measurement and Instrumentation ◽

10.1016/j.flowmeasinst.2021.101930 ◽

2021 ◽

pp. 101930

Author(s):

N.I. Mikheev ◽

V.M. Molochnikov ◽

D.V. Kratirov ◽

O.A. Dushina ◽

A.A. Paereliy ◽

...

Keyword(s):

Flow Rate ◽

Liquid Flow ◽

Liquid Flow Rate ◽

Primary Standard ◽

New Approach ◽

National Primary Standard

Download Full-text

GET 8–2019 State Primary Standard of Units of Air Kerma, Air Kerma Rate, Exposure, Exposure Rate, and Energy Flux of X-Radiation and Gamma Radiation

Measurement Techniques ◽

10.1007/s11018-020-01828-7 ◽

2020 ◽

Vol 63 (8) ◽

pp. 597-601

Author(s):

A. V. Oborin ◽

A. Yu. Villevalde ◽

S. G. Trofimchuk

Keyword(s):

Gamma Radiation ◽

Energy Flux ◽

Primary Standard ◽

State Primary Standard ◽

Exposure Rate ◽

Air Kerma ◽

Air Kerma Rate

Download Full-text

National primary standard for the unit of the propagation velocity of ultrasonic waves in solids

Measurement Techniques ◽

10.1007/s11018-012-9884-3 ◽

2012 ◽

Vol 54 (11) ◽

pp. 1219-1224 ◽

Cited By ~ 2

Author(s):

P. V. Bazylev ◽

A. V. Izotov ◽

A. I. Kondratiev ◽

V. A. Lugovoi ◽

V. P. Nigai ◽

...

Keyword(s):

Propagation Velocity ◽

Primary Standard ◽

Ultrasonic Waves ◽

National Primary Standard

Download Full-text

RE-EVALUATION OF THE AIR KERMA PRIMARY STANDARD OF THE SMU IN 60Co AND 137Cs GAMMA RAY BEAMS

Radiation Protection Dosimetry ◽

10.1093/rpd/ncz210 ◽

2019 ◽

Vol 186 (2-3) ◽

pp. 235-238

Author(s):

Norman Durný

Keyword(s):

Gamma Ray ◽

Primary Standard ◽

National Standard ◽

Key Comparisons ◽

Main Role ◽

Correction Factors ◽

Active Volume ◽

Air Kerma ◽

60Co Gamma

Abstract The primary standard for air kerma of the Slovak Institute of Metrology (SMU) as a part of national standard of dosimetric quantities of gamma radiation NE028/02, based on cylindrical graphite walled cavity ionization chamber was established in 2002 for the 60Co gamma ray beams. Since then the main role of SMU was to continuously maintain, develop and refurbish the standard with related accessory to ensure international equivalence. Since 2002, a re-evaluation of the active volume of the ionizing chamber, correction factors, the key data, due to adoption of ICRU Report 90(1), and changes of the calibrations methods and corrections of the equipment were made to obtain improved parameters. The range was extended for 137Cs gamma ray beams and key comparisons with the Bureau International des Poids et Mesures (BIPM) were performed. ICRU Report 90(1) implementation led to a decrease of the Gray of −0.84% for 60Co and −0.80% for 137Cs.

Download Full-text