ISO 18090-1:2026 PDF

Overview

ISO 18090-1:2026 specifies the characteristics of reference pulsed photon radiation, focusing particularly on pulsed X-radiation with pulse durations ranging from 0.1 milliseconds up to 10 seconds. This is the essential range commonly used in medical diagnostics and related applications at the time of publication. The standard establishes guidance for calibrating and testing radiation protection dosemeters and dose rate meters in pulsed radiation fields, ensuring reliable, standardized measurement and radiological protection.

The requirements and methods outlined in ISO 18090-1:2026 are crucial for laboratories, equipment manufacturers, and regulatory bodies that need consistent calibration methods and reliable performance of radiological instruments under pulsed radiation. The document links parameters for pulsed radiation to those established for continuous radiation in existing ISO and IEC standards, promoting harmonized radiation protection procedures worldwide.

Key Topics

• Applicable Pulse Range: Directly addresses pulsed X-radiation with pulse durations from 0.1 ms to 10 s, covering all diagnostic medical imaging requirements.
• Core Radiation Characteristics:
  • Time-dependent behavior of air kerma rate during a pulse
  • Time-dependent high voltage behavior of the X-ray tube during the pulse
  • Uniformity of air kerma rate within the cross-sectional beam area
  • Air kerma per radiation pulse
  • Air kerma rate of the pulse
  • Repetition frequency of pulses (reference for future extensions)
• Instrument Calibration and Testing:
  • Defines measurable criteria for dosemeters and dose rate meters.
  • Stipulates requirements for field uniformity and sensitivity.
  • Addresses how to assess detector performance with single pulses-typically the most challenging scenario for measurement accuracy.
• Reference Radiation Qualities:
  • No new radiation qualities are created; parameters reference those specified in established ISO and IEC standards.
• Equivalence and Comparisons:
  • Introduces methods to equate the measured pulse with an idealized trapezoidal radiation pulse for calibration consistency.

Applications

ISO 18090-1:2026 provides practical value for a wide range of radiological protection and quality assurance activities, including:

• Medical Imaging: Used extensively in calibration and testing of radiation protection instruments where pulsed X-ray systems (such as fluoroscopy, angiography, and computed tomography) are common.
• Radiation Protection Laboratories: Enables national metrology institutes, calibration labs, and regulatory agencies to establish dependable reference conditions for testing radiation monitoring instruments.
• Equipment Manufacturers: Offers essential guidance to manufacturers of dosemeters and dose rate meters, ensuring their products meet internationally recognized calibration requirements in pulsed photon fields.
• Research and Development: Supports researchers developing new technologies (such as X-ray flash units or high-intensity femtosecond lasers) by providing a standardized framework for pulse characterization.
• Occupational Safety: Informs users and safety managers in healthcare, industry, and research sectors about best practices for instrument verification when working with pulsed X-ray sources.

Related Standards

• ISO 4037 Series: Reference standards for X and gamma reference radiation fields, including methods for calibrating and testing dosemeters in terms of photon energy response.
• IEC 61267: Specifies requirements for radiation conditions in medical diagnostic X-ray equipment, essential for consistent equipment performance testing.
• IEC/TS 62743 and IEC/TS 63050: Address instrument test procedures and requirements for electronic radiation protection dosemeters in pulsed radiation environments.
• ISO 18090 Series: This is Part 1 (Photon radiation); additional parts generally address other radiation types or expanded scope.

By adhering to ISO 18090-1:2026, organizations ensure accuracy, reliability, and international comparability in the calibration and use of radiation protection instruments, contributing to improved radiological safety and regulatory compliance.