阅读说明：本技术 一种高通量和信号强度稳定的回顾性剂量测量法 (retrospective dosimetry method with high flux and stable signal intensity ) 是由 赵修良 贺三军 陈斌 赵健为 刘丽艳 周超 于 2019-08-06 设计创作，主要内容包括：本发明公开了一种高通量和信号强度稳定的回顾性剂量测量法,包括：一,将现场食盐制作成多个剂量元件；二,利用脉冲光致发光技术对各剂量元件进行检测,在完全激发出食盐剂量信息的前提下,确定最高剂量的食盐剂量元件所需的检测次数n；三,对辐射过不同剂量的各剂量元件进行n次检测,得到食盐OSL信号与吸收剂量之间的关系；四,测量现场食盐的光致发光信号,根据食盐OSL信号与吸收剂量之间的关系,计算得到食盐吸收剂量。本发明基于光致发光技术,以食盐为回顾性剂量材料,提供一种高通量和信号强度稳定的回顾性剂量测量法,能有效测量紧急核泄漏事件中现场食盐的辐射吸收剂量,为测量核事故中公众剂量提供一种高通量和信号强度稳定的测量方法。(The invention discloses a retrospective dosimetry method with high flux and stable signal intensity, which comprises the following steps: firstly, preparing on-site table salt into a plurality of dosage elements; secondly, detecting each dosage element by using a pulse photoluminescence technology, and determining the detection times n required by the dosage element with the highest dosage on the premise of completely exciting the dosage information of the table salt; thirdly, detecting each dosage element irradiated with different dosages for n times to obtain the relationship between the salt OSL signal and the absorbed dosage; and fourthly, measuring the photoluminescence signal of the on-site table salt, and calculating the table salt absorbed dose according to the relation between the table salt OSL signal and the absorbed dose. The invention provides a retrospective dosimetry method with high flux and stable signal intensity by taking salt as a retrospective dosage material based on a photoluminescence technology, can effectively measure the radiation absorption dosage of the on-site salt in an emergency nuclear leakage event, and provides a measurement method with high flux and stable signal intensity for measuring the public dosage in a nuclear accident.)

1. a high-throughput and signal-intensity-stable retrospective dosimetry method, comprising the steps of:

Firstly, manufacturing on-site table salt into a plurality of dosage elements;

Secondly, detecting various dosage elements irradiated with different dosages by using a pulse photoluminescence technology, and determining the detection times n required by the dosage element with the highest dosage of table salt on the premise of completely exciting table salt dosage information;

Step three, detecting each dosage element n times to obtain the relation between the salt OSL signal and the absorbed dosage;

and step four, measuring a photoluminescence signal of the on-site salt, and calculating the absorbed dose of the salt according to the relation between the OSL signal of the salt and the absorbed dose.

2. The high-throughput, signal-strength-stabilized retrospective dosimetry of claim 1, wherein step one comprises:

Collecting on-site salt and forming a plurality of salt samples;

A plurality of table salt samples are respectively irradiated with different doses to form a plurality of dose elements.

3. a low detection limit radiation dosimetry method according to claim 2, further comprising: the salt samples were photo-annealed prior to irradiation of the test samples.

4. A radiation dosimetry method with low detection limit according to claim 2, wherein the doses of radiation to the plurality of table salt samples are respectively: 1mGy, 2mGy, 4mGy, 6mGy, 8mGy, 10mGy, 20mGy, 40mGy, 60mGy, 80mGy, 100 mGy.

5. a radiation dose measuring method with a low detection lower limit as defined in claim 1, wherein the pulse width is 20ms, the pulse interval is 1000ms, and the number of pulses is 50 during the detection.

Technical Field

The invention belongs to the technical field of nuclear radiation dosimetry measurement, and particularly relates to a retrospective dosimetry method with high flux and stable signal intensity.

Background

under the emergency nuclear leakage accident, people cannot directly obtain the ionizing radiation dose suffered by the people through the reading of the personal dosimeter because the people cannot carry the personal dosimeter of the ionizing radiation, and a retrospective dose method is needed to be adopted to measure the radiation dose of the people by using materials replacing the personal dosimeter. Common salt is distributed all over the world and can be easily collected in each household, workplaces, restaurants and other occasions, and the main component NaCl of the common salt has the characteristics of a photoluminescence material and can be used as a nuclear accident dosage material.

Retrospective dosage methods are divided into biological dosage methods and physical dosage methods, and for the biological dosage methods, substances at the cellular level or the molecular level in a human body are used as dosimeters, but the effects of different biological dosimeters in the human body and ionizing radiation are different, and dosage measurement needs to be performed on each person, so that the method is small in measurement flux and still less in application to emergency nuclear accidents; the physical dose method uses a physical material as a dose material for dose measurement, mainly including an electron spin resonance method, a thermoluminescence method and a photoluminescence method, and there are many materials that can be used for the electron spin resonance method and the thermoluminescence method, but in the two methods, the intensity of luminescence signals of most of the physical materials with dose information is seriously attenuated.

Disclosure of Invention

The object of the present invention is to provide a retrospective dosimetry method with high flux and stable signal intensity based on photoluminescence technology and using common salt as retrospective dosage material, which can effectively measure the radiation absorption dose of the common salt in the scene of the emergency nuclear leakage event, and provide a high flux and stable signal intensity measurement method for measuring the public dosage in nuclear accident.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

A retrospective dosimetry method with high throughput and stable signal strength is characterized by comprising the following steps:

firstly, manufacturing on-site table salt into a plurality of dosage elements;

secondly, detecting various dosage elements irradiated with different dosages by using a pulse photoluminescence technology, and determining the detection times n required by the dosage element with the highest dosage of table salt on the premise of completely exciting table salt dosage information;

Step three, detecting each dosage element n times to obtain the relation between the salt OSL signal and the absorbed dosage;

And step four, measuring a photoluminescence signal of the on-site salt, and calculating the absorbed dose of the salt according to the relation between the OSL signal of the salt and the absorbed dose.

as a preferred mode, the first step includes:

Collecting on-site salt and forming a plurality of salt samples;

A plurality of table salt samples are respectively irradiated with different doses to form a plurality of dose elements.

Further, still include: the salt samples were photo-annealed prior to irradiation of the test samples.

In one preferred embodiment, the pulse width is 20ms, the pulse interval is 1000ms, and the number of pulses is 50 during the detection.

as a preferable mode, the doses of the radiation to the plurality of salt samples are respectively as follows: 1mGy, 2mGy, 4mGy, 6mGy, 8mGy, 10mGy, 20mGy, 40mGy, 60mGy, 80mGy, 100 mGy.

Compared with the prior art, the invention provides a retrospective dosimetry method with high flux and stable signal intensity by taking common salt as a retrospective dosage material based on a photoluminescence technology, can effectively measure the radiation absorption dosage of the field common salt in an emergency nuclear leakage event, and provides a measurement method with high flux and stable signal intensity for measuring the public dosage in a nuclear accident.

drawings

FIG. 1 is a flow chart of an embodiment of the present invention.

FIG. 2 is the relationship between the photoluminescence signal of salt in 1-100mGy and the detection frequency.

Figure 3 is a dose response curve of the saline photoluminescence signal.

Detailed Description

in this example, the salt OSL signal was measured using an Inlight type 200 dose measuring system, blue dalton, usa, and pulse width, pulse interval, and pulse number parameters were set to 20ms, 1000ms, and 50, respectively.

As shown in fig. 1, an embodiment of the present invention comprises the following steps:

A. Making in situ salt into dosage elements:

collecting on-site salt and forming a plurality of salt samples;

Performing light annealing treatment on the salt sample to ensure that the background dosage of the salt is consistent;

different doses were irradiated on multiple saline samples: 1mGy, 2mGy, 4mGy, 6mGy, 8mGy, 10mGy, 20mGy, 40mGy, 60mGy, 80mGy, 100mGy, thereby forming a plurality of dosage elements.

B. the four-element salt container is manufactured by using a 3D printing technology, and can enter a measuring channel of an InLight200A type dosage measuring system to achieve the purpose of measuring a salt photoluminescence signal.

C. The irradiated salt dosage element was placed in a four-component salt container with transparent adhesive tape on both sides to secure the salt dosage element.

D. the four-element salt container is placed into an InLight200A type dosage measuring system, the detection times n required by the complete excitation of the salt (100mGy) dosage information are determined, and the salt is detected for all the dosages for the same times (n times), so that the relationship curve between the salt OSL signal and the dosage is obtained.

E. Measuring the photoluminescence signal of the on-site table salt, and calculating the table salt absorbed dose according to the relation between the table salt OSL signal and the absorbed dose.

while the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.