1 Scope
This standard specifies the limit hygienic indicators for 226Ra in phosphate fertilizer and its compound fertilizer (hereinafter collectively referred to as phosphorous fertilizer) as well as the corresponding requirements for its sampling and inspection and result determination.
This standard is applicable to phosphorous fertilizers used in agriculture (including edible crops such as vegetables and fruit trees).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 11713 Standard methods of analyzing low specific gamma radioactivity samples by semiconductor gamma spectrometers
GB 11743 Determination of radionuclides in soil by gamma spectrometry
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
phosphate fertilizer
chemical fertilizer with phosphorus as the only main nutrient element
3.2
compound phosphorus fertilizer
chemical fertilizer containing phosphorus and other main nutrient elements (such as nitrogen and potassium) at the same time
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Limit for 226Ra in phosphorous fertilizers
5 Inspection requirements
6 Result determination
Annex A (Normative) Sample collection and preparation
Annex B (Normative) Determination of 226Ra - Emanation scintillation method
