Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: BS ISO 8769-TC:2020
• Năm ban hành / Publication date: 2020
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng việt / Title in Vietnamese: Tracked Changes (Redline) - Reference sources — Calibration of surface contamination monitors — Alpha-, beta- and photon emitters
• Tên tiếng anh / Title in English: Tracked Changes (Redline) - Reference sources — Calibration of surface contamination monitors — Alpha-, beta- and photon emitters

Thay thế bằng / Replaced by

BS ISO 8769-TC:2020

Lịch sử soát xét / History of version

• BS ISO 8769-TC:2020 
• BS ISO 8769-TC:2020(W - Hết hiệu lực)

• Chỉ số phân loại / By field: 17.240 - Ðo phóng xạ
• Số trang / Page: 51

Phạm vi áp dụng / Scope of standard

This International Standard specifies the characteristics of reference sources of radioactive surface contamination, traceable to national measurement standards, for the calibration of surface contamination monitors. This International Standard relates to alpha-emitters, beta-emitters, and photon emitters of maximum photon energy not greater than 1,5 MeV. It does not describe the procedures involved in the use of these reference sources for the calibration of surface contamination monitors. Such procedures are specified in IEC 60325^[8], IEC 62363^[9], and other documents.

NOTE Since some of the proposed photon sources include filters, the photon sources are to be regarded as sources of photons of a particular energy range and not as sources of a particular radionuclide. For example, a ²⁴¹Am source with the recommended filtration does not emit from the surface the alpha particles or characteristic low-energy L X-ray photons associated with the decay of the nuclide. It is designed to be a source that emits photons with an average energy of approximately 60 keV.

This International Standard also specifies preferred reference radiations for the calibration of surface contamination monitors. These reference radiations are realized in the form of adequately characterized large area sources specified, without exception, in terms of surface emission rates which are traceable to national standards.

^[8] IEC 60325, Radiation protection instrumentation- Alpha, beta and alpha/beta (beta energy > 60 keV) contamination meters and monitors

^[9] IEC 62363, Radiation protection instrumentation - Portable photon contamination meters and monitors