UNE-EN ISO 18090-1:2026
Current
The latest, up-to-date edition.
Radiological protection - Characteristics of reference pulsed radiation - Part 1: Photon radiation (ISO 18090-1:2026) (Endorsed by Asociación Española de Normalización in July of 2026.)
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English
01-07-2026
This document is directly applicable to pulsed X-radiation with pulse duration of 0,1 ms up to 10 s. This range covers the whole range used in medical diagnostics at the time of publication. Some specificationsmay also be applicable for much shorter pulses; one example is the air kerma of one pulse. Such a pulse may be produced, e.g. by X-ray flash units or high-intensity femtosecond-lasers. Other specifications are notapplicable for much shorter pulses; one example is the time-dependent behaviour of the air kerma rate. This may not be measurable for technical reasons as no suitable instrument is available, e.g. for pulses producedby a femtosecond-laser.This document specifies the characteristics of reference pulsed radiation for calibrating and testing radiation protection dosemeters and dose rate meters with respect to their response to pulsed radiation. Atthis point, it is only concerned with the characteristics of single pulses. Single pulses are the most difficult for dosemeters to measure. Determining the dose for repeated pulses is easier, but still more difficult thanfor continuous radiation, i.e. the performance of the dosemeters when measuring repeated pulses lies between these extremes. The radiation characteristics includes the following:a) time-dependent behaviour of the air kerma rate of the pulse;b) time-dependent behaviour of the X-ray tube high voltage during the pulse;c) uniformity of the air kerma rate within a cross-sectional area of the radiation beam;d) air kerma of one radiation pulse;e) air kerma rate of the radiation pulse;f) repetition frequency.This document does not define new radiation qualities, but uses those radiation qualities specified in existing ISO and IEC standards. Instead, this document gives the link between the parameters for pulsed radiationand the parameters for continuous radiation specifying the radiation qualities. It does not specify specific values or series of values for the pulsed radiation field but specifies only those limits for the relevant pulsedradiation parameters that are required for calibrating dosemeters and dose rate meters and for determining their response depending on the said parameters.The pulse parameters with respect to the phantom-related quantities were determined using conversión coefficients according to ISO 4037 (all parts). This is possible as the radiation qualities specified in existingISO and IEC standards are used.A given reference pulsed X-ray facility is characterized by the parameter ranges over which the full specifications and requirements according to this document are met. Therefore, not all reference pulsedX-ray facilities can produce pulses covering the same parameter ranges.
| Committee |
CTN 73
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
Asociación Española de Normalización
|
| Status |
Current
|
| Standards | Relationship |
| ISO 18090-1:2026 | Identical |
| I.S. EN ISO 18090-1:2026 | Equivalent |
| EN ISO 18090-1:2026 | Identical |
| BS EN ISO 18090-1:2026 | Equivalent |
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