CN211455323U

CN211455323U - Iridium-192 rear loading source

Info

Publication number: CN211455323U
Application number: CN201922079512.2U
Authority: CN
Inventors: 崔洪起; 李梅
Original assignee: Atom High Tech Co ltd; Beijing Shuangyuan Isotope Technology Co ltd
Current assignee: Atom High Tech Co ltd; Beijing Shuangyuan Isotope Technology Co ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-09-08
Anticipated expiration: 2029-11-27

Abstract

The utility model relates to an iridium-192 after-loading source, the after-loading source comprises a source shell, a source core and a source braid, the source shell is wrapped outside the source core, and the source braid is used for connecting the source shell and a steel wire rope; the length of the source braid is 1500-2500 mm. The iridium-192 back loading welding spot is semicircular, has good sealing performance and no leakage and pollution on the surface. The activity parallelism is good, the maximum deviation is within +/-5%, and the performance index of the product meets the use requirements of most medical after-installation machines in China.

Description

Iridium-192 rear loading source

Technical Field

The utility model belongs to the nuclear technology application field of medical instrument configuration articles containing radioactive sources, in particular to an iridium-192 back loading and argon arc welding sealing process.

Background

The radiation therapy is one of the main therapeutic means for treating tumor, and the iridium-192 after-loading source is applied to the after-loading machine after radiation therapy, so that the treatment range of the after-loading machine for tumor is expanded from the traditional gynecology to the esophagus, stomach, nasopharynx, lung, trachea, rectum, bladder and other cavities, and the after-loading machine can also be inserted into thyroid, mammary gland, liver, kidney, pancreas and other organs, and has unique characteristics for tumor treatment in operation forbidden areas. The traditional Chinese medicine composition is widely applied to treatment of cervical cancer, biliary tract tumor and other diseases, has special effects on gynecological cervical cancer, rhinitis cancer, rectal cancer and the like, and is irreplaceable. The high-activity micro iridium-192 radioactive source has the advantages of small volume, high activity and the like, and is very suitable for intracavity afterloading treatment. The energy of the iridium-192 is suitable for a human body, the average energy of gamma rays is only 380KeV, the iridium-192 can be loaded into the human body through the afterloader control, the iridium-192 can be used for focus site-specific treatment, cancer cells are killed, damage to normal tissues and organs such as viscera is reduced, and a remarkable effect is achieved. Iridium-192 also has the unique advantage that the gamma energy range of iridium-192 is such that its exponential decay in the medium is exactly compensated by the scatterometry factor, which makes the dose rate squared product approximately constant at any point over the 5cm range of clinical interest from the source. In addition, the half-value layer is only 2.4mm lead, the protection is simple, and the fund is saved. Meanwhile, the half-life period is short (74d), the waste source is easy to treat, the sealed radioactive source does not release gas and liquid radioactive effluents, and the radioactive influence on the environment can not be caused as long as the application is strictly carried out according to the radiation protection requirement. By combining the advantages, the modern intracavity afterloading therapeutic machine adopts the iridium-192 source.

The iridium-192 after-loading source in the prior art has poor tightness, low activity, poor activity parallelism and high cost, and occurs when leakage occurs.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the background art, it is an object of the present invention to provide an iridium-192 afterload source.

In order to achieve the above object, the present invention provides the following technical solutions:

an iridium-192 afterloader source comprising a source shell, a source core, and a source braid, the source shell being wrapped around the exterior of the source core, the source braid being for connecting the source shell to a steel wire rope;

the length of the source braid is 1500-2500 mm.

As a preferable scheme, the diameter of the iridium-192 after-loading source is 0.9-1.3 mm; the length of the iridium-192 rear source is 3.5-6.5 mm.

Preferably, the welding point of the iridium-192 after-loading source is semicircular.

The beneficial effects of the utility model reside in that:

the utility model provides an iridium-192 back loading diameter is between phi 0.9 ~ phi 1.3mm, and length is between 3.5 ~ 6.5 mm. The source welding spot is semicircular, has good sealing performance, no leakage, no surface pollution and good activity parallelism, and the maximum deviation is within +/-5 percent.

The utility model provides an iridium-192 back dress source, the activity ratio is 1-20Ci, and the active region size is phi 0.5 ~ phi 1X 1 ~ 5mm, and source braid length is 1500 ~ 2500mm, and the performance index of product satisfies the operation requirement of domestic most medical back installation.

Drawings

FIG. 1 is a schematic structural view of an iridium-192 rear mounting source of the present invention;

wherein, 1-source shell; 2-source core; 3-source braid.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples.

Example 1:

the embodiment provides an iridium-192 rear source, which is structurally shown in fig. 1 and comprises a source shell 1, a source core 2 and a source braid 3, wherein the source shell is wrapped outside the source core, and the source braid is used for connecting the source shell and a steel wire rope.

The after-loading source had overall dimensions of Φ 1.1 × 6.5mm and a source braid length of 1500 mm.

The iridium-192 afterloading source can be prepared by the following steps:

(1) target making: an iridium wire with the purity of more than 99.9 percent is selected as a target material and is made into an irradiation target. The reactor is used for irradiation, and the 194Ir nuclide in the irradiated iridium source needs to be stored for a proper time in order to completely decay. The diameter of the iridium wire is 0.5-1 mm, and the length of the iridium wire is 0.6-4.5 mm. The time of stacking illumination is 10-20 days, and the storage time after stacking illumination is 1-5 days.

(2) Measurement before loading: the target material was cut open with a cutter in the work box and the activity of each iridium material was measured with a liveness meter and recorded. The measurement result of the activity of the source core is 1-20 Ci.

(3) Preparing a source braid: and cleaning the source shell and the source braid together, placing aside for later use, and welding the source shell and the source braid by argon arc welding for later use.

(4) Assembling and welding sealing: iridium raw material with a measured activity of 10Ci is loaded into a source housing with a source braid in a work box by a robot with the aid of special tools. And welding the source shell by argon arc welding at a current of 5-20A.

(5) Quality inspection: and cleaning the welded finished product source for 1 minute by using ultrasonic waves, and measuring the activity of the cleaning solution by using a gamma counter, wherein the activity is less than 200Bq, which indicates that the welding machine is free from pollution and leakage.

And (4) placing the qualified finished product source into a specific packaging container, and labeling for delivery.

Example 2:

this example provides an iridium-192 rear loading source with overall dimensions of Φ 0.9 x 3.5mm and a source pigtail length of 2000 mm.

The rest is the same as in example 1.

Example 3:

this example provides an iridium-192 rear loading source with overall dimensions of Φ 1.3 x 5.0mm and a source pigtail length of 2500 mm.

The rest is the same as in example 1.

The above description is provided for the specific description of the present invention, and it should not be construed that the embodiments of the present invention are limited to these descriptions. To the ordinary technical personnel of the utility model belongs to the technical field, under the prerequisite that does not deviate from the utility model design, can also make a plurality of simple deductions and transform, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. An iridium-192 back-loading source, comprising a source shell, a source core and a source braid, wherein the source shell is wrapped outside the source core, and the source braid is used for connecting the source shell with a steel wire rope;

the length of the source braid is 1500-2500 mm.

2. The iridium-192 post-load source of claim 1 wherein the iridium-192 post-load source has a diameter of 0.9 to 1.3 mm; the length of the iridium-192 rear source is 3.5-6.5 mm.

3. The iridium-192 post-source of claim 1 wherein the welds of the iridium-192 post-source are semicircular.