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The use of relatively small sources for the calibration of area survey meters.

Scott, C J; Woods, M J; Keightley, J D (1997) The use of relatively small sources for the calibration of area survey meters. NPL Report. CIRM 6

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The contiguous portions method is a technique employed to calibrate surface contamination monitors when calibration sources having an active area greater than that of the detector are not available.
A series of experiments were undertaken to determine whether the method would be adversely affected by source and detector inhomogeneity, backscatter and repeated exposure to the edges of the calibration source. Comprehensive field trials compared the results of five laboratories performing contiguous portions calibrations to demonstrate the repeatability of the method. The additional uncertainty introduced to a calibration by the adoption of the contiguous portions method is of the order of 10 % when steps are taken to minimise a number of effects and detailed guidelines are followed.
Measurements made on a specially fabricated 500 x 500 mm source allowed validation of the method when detector responses from it were compared with those from a representative 100 x 100 mm piece of that source employed in the contiguous portions method.
A recommended protocol for the performance of the contiguous portions technique and guidance for the determination of additional error bounds are included.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CIRM 6
Subjects: Ionising Radiation
Ionising Radiation > Dosimetry
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/708

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