BS PD ISO/TS 18090-1:2015

BS PD ISO/TS 18090-1:2015 is directly applicable to pulsed X-radiation with pulse duration of 0,1 msup to 10 s. This covers the whole range used in medical diagnostics at the time of publication. Somespecifications may 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. Otherspecifications are not applicable for much shorter pulses; one example is the time-dependent behaviourof the air kerma rate. This may not be measurable for technical reasons as no suitable instrument isavailable, e.g. for pulses produced by a femtosecond-laser.This part of ISO/TS 18090 specifies the characteristics of reference pulsed radiation for calibrating andtesting radiation protection dosemeters and dose rate meters with respect to their response to pulsedradiation. The radiation characteristics includes the following:

• time-dependent behaviour of the air kerma rate of the pulse;
• time-dependent behaviour of the X-ray tube high voltage during the pulse;
• uniformity of the air kerma rate within a cross-sectional area of the radiation beam;
• air kerma of one radiation pulse;
• air kerma rate of the radiation pulse;
• repetition frequency.

This part of ISO/TS 18090 does not define new radiation qualities. Instead, it uses those radiationqualities specified in existing ISO and IEC standards. This part of ISO/TS 18090 gives the link betweenthe parameters for pulsed radiation and the parameters for continuous radiation specifying theradiation qualities. It does not specify specific values or series of values for the pulsed radiation field butspecifies only those limits for the relevant pulsed radiation parameters that are required for calibratingdosemeters 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 usingconversion coefficients according to ISO 4037 (all parts). This is possible as the radiation qualitiesspecified in existing ISO and IEC standards are used.A given reference pulsed X-ray facility is characterized by the parameter ranges over which the fullspecifications and requirements according to this part of ISO/TS 18090 are met. Therefore, not allreference pulsed X-ray facilities can produce pulses covering the same parameter ranges.Cross References:ISO 4037-1:1996ISO 4037-2:1997IEC 60050-395:2014IEC 61267:2005ICRU 34ISO 4037-3:1999IEC 60050