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Method for graduating barreled nuclear waste neutron measuring device

A technology of measuring device and calibration method, which is applied in the direction of measuring device, neutron radiation measurement, radiation measurement, etc., and can solve the problems such as not providing a calibration method for barreled nuclear waste

Active Publication Date: 2013-12-18
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The China Institute of Atomic Energy disclosed a barreled nuclear waste neutron detection device in ZL 201020001146.5, but did not provide a calibration method for using the device to detect barreled nuclear waste

Method used

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  • Method for graduating barreled nuclear waste neutron measuring device
  • Method for graduating barreled nuclear waste neutron measuring device
  • Method for graduating barreled nuclear waste neutron measuring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, set the 240 Pu eff Standard samples with masses of 19.98mg, 9.96mg, 4.10mg, 2.02mg, 0.94mg, and 0.52mg were put into waste bins such as figure 1 At the 25 measuring points shown, the bucket is filled with concrete medium, and the measuring device is used to detect neutrons. The measuring time is 100s. After obtaining the counting rate of each sample at the measuring point, the equivalent counting rate of the measuring device is calculated, as shown in Table 2.

[0046]

[0047] (2) Calculate the spontaneous fission neutron count rate of different standard samples according to the equivalent count rate T sp , and build scale curve.

[0048] The curve is , the correlation coefficient is 0.9984.

Embodiment 2

[0050] First, select a waste bin filled with concrete media, place 240 Pu eff Samples with a mass of 19.88 mg were placed in figure 1 Measure the total neutron count rate at the 25 measurement points shown, and the measurement time is 50s. Each measurement point is measured 18 times and the average value is taken to obtain the count rate of each measurement point, which is substituted into the following formula: , calculate the equivalent count rate of the device under the medium condition is 24.01 / s, select the center point as the reference point, and measure the count rate of the center point is 24.38 / s, and according to the formula Calculate the correction factor at the center point =0.9848.

[0051] Then, measure 240 Pu eff The count rate of the center of samples with masses of 9.96mg, 4.10mg, 2.02mg, 0.94mg, 0.52mg respectively , the measurement time is 100s, and the measurement times are 18 times. Will Multiplied by the correction factor for this con...

Embodiment 3

[0056] The steps and methods used in Example 2 are the same, except that the medium condition and measurement time are changed, and the measurement time is 200s. As shown in Table 4:

[0057]

[0058] The obtained scale relationship curve is shown in Table 5:

[0059]

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Abstract

The invention belongs to the technical field of radioactive waste detection and discloses a method for graduating a barreled nuclear waste neutron measuring device. The method is realized according to the following steps: (1), placing a series of standard samples of different 240Pueff mass at a measuring point of a waste barrel, utilizing a measuring device to detect neutrons, and calculating an equivalent counting rate of the measuring device after acquiring counting rates of all samples at the measuring point; (2), calculating spontaneous fission neutron counting rates Tsp of different standard samples, and establishing graduation curves Tsp-(240) Pu (eff). By the method, the barreled nuclear waste neutron measuring device can be accurately graduated to acquire the graduation curves.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste detection, and in particular relates to a calibration method for a drum-packed nuclear waste neutron measuring device. Background technique [0002] During the production, operation and decommissioning of nuclear facilities, a large amount of radioactive solid waste is generated, and the waste generation unit reconditions the waste and puts it into standard waste bins. Before disposing of these nuclear wastes, they must be accurately identified and measured to obtain the nuclides and nuclides contained in the wastes in order to manage nuclear wastes. According to my country's classification standards and management requirements for radioactive waste, nuclear waste in barrels is divided into alpha waste and non-alpha waste. If the nuclear waste is determined to be non-alpha waste through testing, it will be disposed of on a shallow surface; otherwise, it will be disposed of for a long tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00
Inventor 祝利群许小明顾少刚苏功建
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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