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Air-Kerma Calibration of Radiation Instrument in X-Ray Beam
Air-Kerma Calibration of Radiation Instrument in X-Ray Beam
Available for Purchase
Primary NIST Technical Contact:
Secondary NIST Technical Contact:
To order, indicate the # of requested beam(s) per instrument, in the Quantity field below. After clicking add to cart, your choice of requested beam(s) from those available on the Additional Information tab, must be provided on the next pop up window, which accepts file upload.
Price: $4,480.00
NIST calibrated x-ray measuring instruments are calibrated in terms of air kerma or exposure by a substitution method in an x-ray beam at a point where the rate has been determined by means of a free-air ionization chamber standard. To provide instrument calibrations over a wide range of x-ray beam qualities, many combinations of generating potential and filtration are available. X-ray beam quality tables can be found on the Additional Information Tab. Beam qualities are identified by beam codes given in the first column. The calibration beam qualities requested should be appropriate to the instrument submitted. If assistance is needed for the beam quality selection process, please contact the NIST technical contact.
An ionization chamber is calibrated in terms of air kerma per unit charge, normalized to reference conditions of 295.15 K and 101.325 kPa. The bias potential is specified by the customer. The ratio of ionization currents for full and half polarizing potentials and the corresponding ionization current will be stated in the calibration certificate An ionization chamber and meter combination, with the meter scale in units of air kerma or exposure is calibrated by providing a dimensionless calibration factor. Chambers found unsuitable for calibration will be returned with a statement of the reason for rejection. A charge may be made for time incurred on the tests. Calibrations of x-ray measuring instruments have a relative expanded uncertainty of 1 %.
Tables (all PDF files)
Key comparison BIPM.RI(I)-K3 of the air-kerma standards of the NIST, USA and the BIPM in medium-energy x- rays, C M. O'Brien, D T. Burns, Ronaldo Minniti, Metrology 54, (2017).
Methods for characterizing a radiation detector for specifying radiation fields during testing against standards for homeland security applications, Anne L. Sallaska, Leticia S. Pibida, Ronaldo Minniti, C M. O'Brien, NIST TN 1916 (2016).
SIM.RI(I)-K3 Comparison of Calibration Coefficients at Radiotherapy Level for Orthovoltage X-ray Beams, C M. O'Brien, J.P. McCaffrey, H Shen, M Saravi, G M. Ortiz, G Stefanic, M Carlos, C.N.M. da Silva, J L. Alvarez, V Tovar, Metrologia 52, (2015).
New National Air-Kerma Standard for Low-Energy Electronic Brachytherapy Sources, Stephen M. Seltzer, C M. O'Brien, Michael G. Mitch, NIST JRES 119.022, (2014).
Test Report-Exposure and Ambient dose Equivalent Rate Measurements in Support of the ITRAP+10 Testing, Leticia S. Pibida, Ronaldo Minniti, Larry L. Lucas, C M. O'Brien, NIST TN 1800, (2013).
Key Comparison BIPM.RI(I)-K2 of the air-kerma standards of the NIST, USA and the BIPM in low-energy x-rays, C M. O'Brien, D T. Burns, C Kessler, IOPscience, (2012).
Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the NIST, USA and the BIPM in mammography x-rays, C M. O'Brien, C. Kessler, D T. Burns, Metrologia 0612, (2011).
Efficiency calibrations of cylindrically bent transmission crystals in the 20 keV to 80 keV x-ray range, Lawrence T. Hudson, C M. O'Brien, Uri Feldman, Stephen M. Seltzer, Hye-Sook Park, John F. Seely, Optics Letters 36, (2011).
Validation Testing of ANSI/IEEE N42.49 Standard Requirements for Personal Emergency Radiation Detectors, Leticia S. Pibida, Ronaldo Minniti, C M. O'Brien, Health Physics 98, (2010).
Comparison between the NIST and the KEBS for the Determination of Air kerma Calibration Coefficients for Narrow X-ray Spectra and Cs-137 Gamma-Ray Beams, C M. O'Brien, Ronaldo Minniti, Stanslaus Masinza, NIST JRES 115, (2010).
Comparison of the NIST and PTB Standards for Air Kerma and Low-Energy X-rays, C M. O'Brien, L. Buermann, NIST JRES 114, (2009).
Comparison of national air kerma standards for ISO 4037 narrow spectrum series in the range 30 kV to 300 kV, C M. O'Brien, L. Buermann, P. Butler, I. Csete, F. Gabris, A. Hakanen, J. -. Lee, M. Palmer, N. Saito, W. deViries, Metrologia 45, (2009).
X-Ray and Gamma-Ray Absorbed Dose Profiles in Teeth: An EPR and Modelling Study, S Sholom, C M. O'Brien, E Bakhanova, V Chumak, Marc F. Desrosiers, A Bouville, NIST JRES, (2007).
Comparison of the NIST and BIPM Standards for Air Kerma in Medium-Energy X-Rays, D T. Burns, C M. O'Brien, NIST JRES 111 No. 5, (2006).
NIST Measurement Services: Calibration of X-Ray and Gamma-Ray Measuring Instruments, P. J. Lamperti, and M. O'Brien, Natl. Inst. Stand. Technol. Spec. Publ. 250-58 (Apr. 2001).
Comparison of the NIST and NPL Air Kerma Standards Used for X-ray Measurements Between 10 kV and 80 kV, C M. O'Brien, P J. Lamperti, T T. Williams, Tillman H. Sander, NIST JRES 105 No. 5, (2000).
Comparison of the NIST and BIPM Air-Kerma Standards for Measurements in the Low-Energy X-Ray Range, D T. Burns, P J. Lamperti, C M. O'Brien, NIST JRES 104 No. 2, (1999).
Comparison of Exposure Standards in the Mammography X-Ray Region, J G. Coletti, D W. Pearson, Larry A. DeWerd, C M. O\'Brien, P J. Lamperti, Medical Physics 24, 8 (1997).
Please contact the NIST Technical Contact listed above before sending your equipment for calibration. A shipping address and RMA number will be provided after an order is placed.
$4,915.00