SN/T 1537-2023Rules for the inspection of radioactivity of imported minerals (English PDF)

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.

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 gamma-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 gamma-ray dose equivalent rate of the surface.

4.4.3.1.3 Take the highest equivalent rate in the entire detection process as the gamma-ray

dose equivalent rate of the inspected products.

4.4.3.1.4 If the gamma-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 gamma-ray dose equivalent rate. Repeat the

measurement 5 times (10s interval) at the highest point. Take the average value of the

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 gamma-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 gamma-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 gamma-ray

dose equivalent rate of the inspected goods.

4.4.4.2 Bulk mineral products transported by land

......