SN/T 1537-2023 English PDF (SNT1537-2023)

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SN/T 1537-2023: Rules for the inspection of radioactivity of imported minerals
SN/T 1537-2023
SN
ENTRY-EXIT INSPECTION AND QUARANTINE INDUSTRY
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.010
CCS D 04
Replacing SN/T 1537-2005
Rules for the inspection of radioactivity of imported
minerals
ISSUED ON: MAY 05, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: General Administration of Customs of the PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 On-site inspection ... 6
5 Determination of test results... 8
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces SN/T 1537-2005 "Rules of radioactivity inspection for import
minerals". Compared with SN/T 1537-2005, in addition to structural adjustments and
editorial changes, the main technical changes are as follows:
a) DELETE the definition of inspection lot (see Chapter 3; 3.1 of the 2005 edition);
b) CHANGE the description of instruments and equipment (see 4.2; 4.2 of the 2005
edition);
c) CHANGE the description of the standard for inspection personnel protection (see
4.3; 4.3 of the 2005 edition);
d) CHANGE the background measurement method (see 4.4.1; 4.4.1 of the 2005
edition);
e) ADD the calculation method of dose equivalent rate (see 4.4.2);
f) CHANGE the radioactivity measurement method (see 4.4.3 and 4.4.4; 4.4.2 and
4.4.3 of the 2005 edition);
g) ADD radionuclide activity concentration test (see 4.4.5);
h) CHANGE the judgment of test results (see Chapter 5; Chapter 5 of the 2005
edition);
i) ADD the requirements for natural radioactivity test and conformity assessment of
non-ferrous metal mineral products, such as copper, lead, zinc, tin, nickel, cobalt
(see 5.1).
Please note that some contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by and shall be under the jurisdiction of the General
Administration of Customs of the People's Republic of China.
The drafting organizations of this document: Qingdao Customs of the People's Republic
of China, Huangdao Customs of the People's Republic of China, Yantai Customs of the
People's Republic of China.
The main drafters of this document: Qi Jialin, Chen Zhe, Qu Zhiyong, Zou Wenwen,
Wang Chonglin, Wu Chunrong, Guo Qiang, Ma Li, Liu Yanyu, Liu Sai.
Rules for the inspection of radioactivity of imported
minerals
1 Scope
This document specifies the inspection methods and result determination of
radioactivity of imported mineral products.
This document applies to radioactivity inspection of imported mineral products
transported by container or bulk.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated reference documents,
only the version corresponding to that date applies to this document; for undated
reference documents, the latest version (including all amendments) applies to this
document.
GB/T 4835.1 Radiation protection instrumentation - Ambient and/or directional
dose equivalent (rate) meters and/or monitors for β, X, γ radiation - Part 1: Portable
workplace and environmental meters and monitors
GB/T 4960.5 Glossary of terms: Nuclear science and technology - Radiation
protection and safety of radiation sources
GB 18871 Basic standards for protection against ionizing radiation and for the safety
of radiation sources
GB 20664 Limitation concentration of natural radioactivity in nonferrous metal ores
and concentrates products
GB 27742 Activity concentration for material not requiring radiological regulation
3 Terms and definitions
The terms and definitions as defined in GB/T 4960.5 apply to this document.
4.4.3 Radioactivity measurement of containerized mineral products
4.4.3.1 Measurement outside the container
4.4.3.1.1 Measure the front, back, left, and right sides of each container.
4.4.3.1.2 Place the probe of the detector close to the outer wall of the container. Find
the highest point of the γ-ray dose equivalent rate on each surface. Repeat the
measurement 5 times (10s interval) at the highest point of each surface. Take the
average value of the 5 measurements as the γ-ray dose equivalent rate of the surface.
4.4.3.1.3 Take the highest equivalent rate in the entire detection process as the γ-ray
dose equivalent rate of the inspected products.
4.4.3.1.4 If the γ-ray dose equivalent rate on any surface measured outside the box
exceeds 5 times the environmental radiation background value, the box shall be opened
for inspection.
4.4.3.2 Container unpacking measurement
Open the container door. Place the probe of the detector 10 cm away from the mineral
product, to find the highest point of the γ-ray dose equivalent rate. Repeat the
measurement 5 times (10s interval) at the highest point. Take the average value of the
5 measurements as the γ-ray dose equivalent rate of the box.
4.4.4 Radioactivity measurement of bulk mineral products
4.4.4.1 Bulk mineral products transported by ship
4.4.4.1.1 For bulk mineral products transported by ship, for batches below 1500 t, at
least 4 inspections shall be conducted at the beginning of unloading, when 1/3, 2/3 of
the total cargo is unloaded, and at the end of unloading; for batches above 1500 t, a
measurement shall be conducted every 500 t.
4.4.4.1.2 Use the grab bucket of the loading and unloading machinery to randomly grab
not less than 50 t of mineral products from different parts of the cargo surface in the
hold; bring them to the inspection site. Pile them into a flat cargo pile with a thickness
of ≥ 1 m and a top diameter of ≥ 2 m. Place the probe of the detector at 0.1 m above the
top surface of the cargo pile. Find the highest point of the γ-ray dose equivalent rate;.
Repeat the measurement 5 times (10s interval) at the highest point. Take the average
value of the 5 measurements as the γ-ray dose equivalent rate of the batch of mineral
products measured at that time.
4.4.4.1.3 Take the highest equivalent rate in the entire detection process as the γ-ray
dose equivalent rate of the inspected goods.
4.4.4.2 Bulk mineral products transported by land