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Gamma irradiation device

Writer: Sterilization Time: 2018-09-26 Browse: 777 ℃

Industrial irradiator

Definition: a facility equipped with particle accelerators, X-ray machines or large radioactive sources and capable of producing high-intensity radiation fields.
Type: external beam radiation therapy device, industrial irradiation device for commodity disinfection or food preservation and industrial radiography device, etc.
 
 
Methods of irradiating products
Product over cover irradiation: the irradiation mode in which the total height of the irradiated product transporter is higher than that of the source rack
Source over cover irradiation: the irradiation mode in which the height of the source rack is higher than the total height of the transporter of the irradiated product.
 
 
Radiation sources for industrial irradiation can be divided into two categories
(1) Gamma radiation sources, including diamond-60 and cesium-137.
(2) Accelerator radiation source, including electron beam and X-ray.

Irradiation device requirements

  • Requirements for the storage of source water of gamma irradiation device: Deionized water is recycled after filtration and cooling. The purpose of filtering well water is to remove impurities in water, protect the surface of source rod, source frame and inner wall of well from corrosion, and maintain the well water clean.
  • Channel requirements: labyrinth type, in order to reduce the impact of direct and scattered radiation on the workplace outside the radiation room.
  • Ventilation: after the air in the irradiation room is ionized, some harmful gases are formed. For example, ozone and nitrogen oxides.
 
The concept of industrial irradiation, also known as radiation processing, refers to a kind of nuclear technology that uses the physical, chemical and biological effects produced by the interaction between ionizing radiation and matter to process and process materials.
Radiation processing usually includes gamma radiation processing and electron accelerator radiation processing.
  • (1) Disinfection of medical supplies (sterilization).
  • (2) Improve crop yield, food quality and food storage.
  • (3) Get high quality chemical products, new materials or material modification.
  • (4) Treatment of industrial three wastes (waste gas, waste water, waste residue).
 

The gamma irradiation devices are divided into the following four categories:

Class 1: self shielded dry source storage irradiator
  • Completely enclosed in a dry container made of solid material
  • Be shielded at any time;
  • The structure design makes it impossible for human body to enter the sealed source and the space under irradiation.
 
Class 2: fixed source chamber dry irradiation device
  • Storage source a radiation facility accessible to controlled personnel of a gamma irradiation facility in which the sealed source is sealed in a dry container made of solid material
  • Completely shielded when not in use
  • The irradiation is carried out in the irradiation room, and the irradiation room can not enter the irradiation room through the entrance control system.
 
Class 3: wet storage source underwater irradiation device
  • The sealing sources are:
  • Put it in a storage tank filled with water
  • It's sealed at all times
  • The structural design and correct use mode restrict personnel access to the sealed source and the space under irradiation.
 
Class 4: fixed source room wet storage gamma irradiation equipment
  • Personnel enter the controlled irradiation facility where the sealed source is
  • Put it in a storage tank filled with water
  • Completely shielded when not in use
  • The irradiation is carried out in the irradiation room, which ensures that personnel can not enter the irradiation room through an entrance control system.
 

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