Name: ISO 29661:2012/Amd 1:2015 — Reference radiation fields for radiation protection — Definitions and fundamental concepts — Amendment 1: Reference point of personal dosemeters
SKU: ISO 29661:2012/Amd 1:2015
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Reference Point of Personal Dosemeters This amendment clarifies how manufacturers should define the reference point and reference direction of personal dosemeters. The reference point is crucial for accurate calibration and measurement of individual radiation doses under various radiation fields.
Phantom Placement and Orientation Personal dosemeters must be positioned on a water slab phantom such that the reference direction through the dosemeters’ reference point hits the center of the phantom surface. This consistent setup applies to all dosemeter types and phantoms, ensuring standardized calibration conditions.
Calibration in Divergent Radiation Fields Unlike idealized parallel beam radiation fields used in theoretical definitions of radiation protection quantities, practical scenarios involve divergent beams. The amendment stresses the importance of defining a reference point for dosemeters under real-world divergent radiation beam conditions during calibrations and type testing.
Radiation Type Considerations
- For photon radiation, due to relatively large source distances and low divergence, the exact reference point has less impact.
- For beta radiation, where calibration distances can be very short and practical measurement distances vary widely, an accurate reference point is critical.
- For neutron radiation, the divergence varies between practical applications and calibration set-ups, affecting reference point definitions.
Backscatter Sensitivity The amendment addresses dosemeters sensitive to backscattered radiation (e.g., neutron albedo dosemeters), suggesting that the reference point may be located on the rear side of the dosemeter opposite the phantom surface to coincide with relevant radiation interactions.
Manufacturer and Laboratory Responsibilities Both manufacturers and calibration/type testing laboratories must carefully determine and communicate the reference point, ensuring compliance with this standard and reflecting realistic use conditions.

ISO 29661:2012/Amd 1:2015 PDF

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