EJ/T 605-2018 Specifications for radon and its progeny survey in uranium exploration English, Anglais, Englisch, Inglés, えいご
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ICS
F
Professional Standard of the People’s Republic of China
EJ/T 605-2018
Specifications for radon and its progeny survey in uranium exploration
铀矿勘查氡及其子体测量规范
(English Translation)
Issue date: 2018-12-28 Implementation date: 2019-03-01
Issued by the Commission of Science, Technology and Industry for National Defense of People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Work Design
5 Work Procedures and Technical Requirements for Instantaneous Radon Measurement Methods
6 Work Procedures and Technical Requirements for Integrating Radon Measurement Methods
7 Quality Requirements for Measurement
8 Routine Data Compilation
9 Anomaly Delineation and Verification
10 Preparation of Results Reports and Maps
Specification for Radon and Its Progeny Measurement in Uranium Exploration
1 Scope
This standard specifies the work design, work procedures, technical requirements, quality requirements for measurement, routine data compilation, anomaly delineation and verification, preparation of results reports and maps for several measurement methods of radon and its progeny in soil.
This standard applies to radon and its progeny measurement in uranium exploration, as well as radon and its progeny measurement for searching other mineral resources. Radon and its progeny measurement in other industries may also refer to this standard for implementation.
2 Normative References
The provisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrigenda) or revisions do not apply to this standard; however, parties entering into agreements based on this standard are encouraged to investigate the possibility of applying the latest editions. For undated references, the latest edition applies.
GB/T 14582 Standard methods for radon measurement in environmental air
EJ/T 1130 Specification for polonium-210 measurement
JJG (Military Industry) 99 Verification regulation for radon progeny concentration measuring instruments
JJG (Nuclear Industry) 024 Verification regulation of radon meters
JJG 825 Verification regulation for radon measuring instruments
JJG 853 Low background alpha and beta measuring instruments
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
instantaneous radon measurement
A method for real-time determination of radon concentration in the field, such as alpha spectrometry, RaA method, scintillation flask method, etc.
3.2
integrating radon measurement
A method for determining radon concentration over a certain period, such as polonium-210 method, activated charcoal adsorption method, track method, alpha cup method, alpha card method, etc.
4 Work Design
4.1 Preparatory Work
Collect geological, geophysical, and geochemical data of the survey area. Study the geological conditions, mineralization characteristics, previous work degree, work quality, and unresolved issues in the survey area. Based on this study, formulate a reconnaissance plan.
Conduct on-site reconnaissance before drafting the technical design. When necessary, carry out a certain amount of conditional tests to understand the terrain, landform, climate, hydrology, and the accumulation, diffusion, and migration conditions of radon in the survey area, in order to formulate a reasonable technical design.
4.2 Design Document Preparation
Prepare the design document based on project requirements (refer to Appendix A).
4.3 Determination of Survey Area
4.3 Determination of Survey Area
The survey area shall be determined based on factors such as the purpose and tasks, metallogenic conditions, soil and overburden looseness, etc.
4.4 Determination of Baselines, Survey Lines, and Survey Grids
4.4.1 Baselines
Baselines shall be laid out according to project requirements. The baseline layout should, as far as possible, be parallel to the strike of the target object. When there are multiple and scattered target objects, the baseline position shall be determined based on the main target object.
For detailed surveys, baselines shall be established using a theodolite, with an allowable length error of ±1% and an allowable azimuth error of ±0.5°. Two or more semi-permanent markers shall be placed on the baseline.
4.4.2 Survey Lines
Survey lines should, as far as possible, be perpendicular to the overall strike of geological bodies, structures, and the target object. The allowable length error for survey lines is ±5%, and the allowable line spacing error is ±10%.
4.4.3 Survey Grids
Survey grids shall be reasonably selected based on the target object and the purpose and tasks, and shall be determined according to the line and point spacing given in Table 1. In case of anomalies, the measurement density should be increased. If necessary, the line and point spacing in Table 1 may be appropriately adjusted, but the allowable error range for the position difference between actual measurement points and designed points on the point location map shall not exceed 1 mm.
4.5 Method Selection and Measurement Point Layout
The requirements for method selection and measurement point layout are as follows:
a) Radon and its progeny measurement work is divided into profile measurement and area measurement, depending on project requirements. Before selecting a radon measurement method and instrument, its principle, operating steps, influencing factors, etc., shall be understood to avoid errors caused by inadequate applicability or improper operation. Factors such as soil structure (porosity, particle size distribution, etc.), humidity, temperature, depth (sampling), interference from thoron, instrument background, response time, recovery time, measurement statistical uncertainty, and saturation level can all affect the measurement results. The most suitable radon measurement method and instrument shall be selected by comprehensively considering the conditions of the survey area, time schedule, purpose and tasks, and the applicable scope and limitations of each method and instrument.
5.1 Preparations Before Measurement
The following equipment and materials shall be prepared before measurement: a radon meter (with a valid verification or calibration certificate and qualified performance), manual or mechanical hole-punching tools, samplers, desiccants, positioning tools, etc.
5.2 Field Reconnaissance
Upon entering the site, the work team shall promptly investigate the work area to become familiar with the general geological and hydrogeological conditions, mineralization characteristics, and distribution of interference sources (e.g., whether there are radioactive ore tailings ponds, waste residue fields, etc.). If necessary, suitable test profiles shall be selected for conducting experimental work on measurement conditions.
