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Method for measuring total alpha and total beta radioactivity in soil

A β-radioactive, soil-based technology, applied in the field of analytical chemistry, can solve problems such as high hazards, and achieve rapid results in determination methods

Inactive Publication Date: 2016-03-30
SGS STANDARD TECHNICAL SERVICES SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But once it enters the body, it will cause more harm

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  • Method for measuring total alpha and total beta radioactivity in soil
  • Method for measuring total alpha and total beta radioactivity in soil

Examples

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Effect test

Embodiment 1

[0022] Example 1: Determination of total alpha and total beta radioactivity in black soil

[0023] 1. Sample preparation:

[0024] Spread the soil sample flat in a flat container with a thickness of less than 5cm. Dry the sample at room temperature (or heat it to dryness in an oven and control the temperature at less than 40°C), then break the initially dried soil, pass it through a nylon sieve, and sieve The hole is 2mm. After sieving, the sample is heated to constant weight, the temperature is controlled at (105±10) ℃, taken out, and cooled to room temperature. Grind the above-mentioned soil, pass through a nylon sieve with a mesh opening of 200 μm, weigh the above-mentioned powder into a measuring pan, and drop a small amount of absolute ethanol to make the sample evenly spread and dry.

[0025] 2. Sample source measurement:

[0026] First measure the radioactive background, the measurement time is 1440min, and then put the sample source into the low-background α / β measuring instr...

Embodiment 2

[0027] Example 2: Determination of total alpha and total beta radioactivity in yellow soil

[0028] 1. Sample preparation:

[0029] Spread the soil sample flat in a flat container with a thickness of less than 5cm. Dry the sample at room temperature (or heat it to dryness in an oven and control the temperature at less than 40°C), then break the initially dried soil, pass it through a nylon sieve, and sieve The hole is 2mm. After sieving, the sample is heated to constant weight, the temperature is controlled at (105±10) ℃, taken out, and cooled to room temperature. Grind the above-mentioned soil, pass through a nylon sieve with a mesh opening of 200 μm, weigh the above-mentioned powder into a measuring pan, and drop a small amount of absolute ethanol to make the sample evenly spread and dry.

[0030] 2. Sample source measurement:

[0031] First measure the radioactive background, the measurement time is 1440min, and then put the sample source into the low-background α / β measuring inst...

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Abstract

The invention discloses a method for measuring total alpha and total beta radioactivity in soil, comprising steps of preparing a sample source and measuring the sample source. The sample source preparation comprises steps of taking a proper amount of drying soil sample, breaking, sieving and heating until a constant weight is achieved, grinding the sample, further obtaining uniform power through further sieving, weighing proper amount of powder, adding waterless ethanol, evenly spreading and drying. The sample source measurement comprises steps of measuring radioactivity background, putting the sample source obtained from the step 1 into a low background alpha / beta measurement instrument and calculating the radioactivity of the total alpha and total beta in the soil through a formula. Compared with the prior art, the measurement method is fast and simple. In the meantime, the radioactivity of the total alpha and the total beta is different from the radioactivity total of the radionuclide and is the respective measurement result under the condition of pretending that the counting efficiency on the alpha particles or the beta particles by the instrument is identical, and the detection limit reaches alpha:400Bq / kg, Beta:200Bq / kg.

Description

[Technical Field] [0001] The invention belongs to the technical field of analytical chemistry, and specifically is a method for measuring total alpha and total beta radioactivity in soil. [Background technique] [0002] Alpha rays, also called "Type A rays", are streams of alpha particles emitted by radioactive materials. It can be emitted from a variety of radioactive materials (such as radium). The kinetic energy of alpha particles can reach 4-9MeV, and they have a strong ionization power. This property can be used, but also brings certain destructiveness. [0003] Beta ray is a charged particle that moves at high speed and is released from the radioactive decay of nuclide. Humans are subject to man-made or natural sources (tritium, C 14 Etc.) Beta rays are more penetrating than α rays. Some beta rays can penetrate the skin and cause radiation damage. But once it enters the body, it causes greater harm. [0004] In the environment where humans live, they are always exposed to ...

Claims

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Application Information

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IPC IPC(8): G01T1/178
CPCG01T1/178
Inventor 王卫廖晓全余锦晖吴雪莉
Owner SGS STANDARD TECHNICAL SERVICES SHANGHAI CO LTD
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