CN2724750Y

CN2724750Y - Gamma ray radiation device

Info

Publication number: CN2724750Y
Application number: CN 200420082131
Authority: CN
Inventors: 沈洪; 张千护
Original assignee: HUAYUAN GAMA MEDICAL EQUIPMENT INVESTMENT CO Ltd HANGZHOU
Current assignee: HUAYUAN GAMA MEDICAL EQUIPMENT INVESTMENT CO Ltd HANGZHOU
Priority date: 2004-08-20
Filing date: 2004-08-20
Publication date: 2005-09-14
Anticipated expiration: 2014-08-20

Abstract

The utility model discloses a gamma ray radiation device, comprising a box body in which an external shielding block, an internal shielding block and a source switch are provided. A small screw rod is arranged on the external shielding block. A group of radioactive sources distributed in a fan shape and aligned with a collimating device are arranged on one end of the small screw rod and are inserted into the internal shielding block. The source switch positioned in the internal shielding block is provided with a notch on the top. The bottom surface guide rail of the source switch matches with a guide rail frame fixed on a bottom surface in a box body, so as to make the radioactive sources be provided with two positions which are shielding state and working state. The utility model adopts uranium 238 as main shielding materials and adopts wolfram 95 as auxiliary shielding materials, so as to make the radiation device have small volume and light weight. The cast iron sealed type box body used for preventing the small dose radiation of the uranium 238 is also served as the basic part of the whole radiation device, so that the radiation device can be demounted form the main machine conveniently. The radioactive sources are arranged in a straight line, so that the volume of the radiation source is further reduced. The parallel moving type source switch adopted by the gamma ray radiation of the utility model can effectively prevent the leakage of the radioactive sources, serving the function of a shielding gate.

Description

Gamma ray radiator

Technical field

This utility model relates to a kind of gamma ray radiator.

Background technology

Radiotherapy apparatus needs the radiation cure functional disease of high dose, but requires equipment volume as far as possible little, and weight is light as far as possible, and the treatment space is big as far as possible.Now use radiation appliance owing to structure, shielding material adopt traditional approach, generally bulky, the weight heaviness.So the miniaturization of radiation appliance, the high dose of radioactive source become the problem that existing equipment must solve.

Summary of the invention

The purpose of this utility model is to provide a kind of gamma ray radiator, can accomplish that the volume of radiation appliance is little, in light weight.

The technical scheme that its technical problem that solves this utility model adopts is:

The external shield piece is installed in the casing according to this from outside to inside, the inner shield piece, source switch, base is equipped with in external shield piece upper end in the case lid, little leading screw is housed on the base, one group is stretched in the inner shield piece by fan-shaped distribution and with a end that the radioactive source of collimator-alignment is contained in little leading screw, the little leading screw other end exposes outside base, base slides by bearing and primary nut, primary nut and little leading screw are formed lead screw pair, for a short time, fix from belt wheel and primary nut, for a short time, link to each other with little main pulley on being contained in the source motor through little synchronous band from belt wheel, be contained in the big main pulley of switch motor warp in the case lid, big band synchronously be contained in big leading screw on link to each other from belt wheel greatly, be fixed with big nut on the lower surface of source switch, big nut is formed lead screw pair with big leading screw, the source switch top that is arranged in the inner shield piece has breach, be fixed with guide rail on the bottom surface of source switch, guide rail matches with guide rail bracket on the inner bottom surface that is fixed on casing.

Inner shield piece, source switch material are nuclear screening material uranium 238, and base, external shield piece, collimator material are high density shielding material tungsten 95.

Both sides at casing are equipped with left rotary shaft, right spindle respectively from focus point.

The useful effect that the utlity model has is:

1. radiological unit of the present utility model has masked state and two kinds of positions of duty, and masked state satisfies 10 ^-6The magnitude attenuation relation, duty satisfies 10 ^-3The magnitude attenuation relation.During work, source positions is advanced to the Source Axis Distance place of 310mm, makes focus dosage rise 50%.The adverse effect that small source axis distance brings, the radiation mode that can adopt multi-radian by device structure, repeatedly focuses on reduces;

2. this utility model employing uranium 238 is main shielding material, and tungsten 95 is the auxiliary shield material; Cast iron enclosed type casing is used for preventing the low dose radiation of uranium 238, and as radiation source mass-type foundation part; The volume that so just can accomplish radiation source is little, in light weight, and radioactive source is a linear array, and the volume of radiation source is further reduced;

3. gamma ray radiator of the present utility model is done shield door with the source switch of parallel-moving type, and source switch can not prevent the leakage of radioactive source effectively when not treating at ordinary times;

4. radiation appliance integral outer of the present utility model is equipped with left and right sides rotating shaft, can pull down from main frame easily and be transported to radioactive source franchise factory, carries out the strange land dress and changes the source, helps using on-the-spot environmental conservation.

Description of drawings

Fig. 1 is a masked state sketch map of the present utility model;

Fig. 2 is a working state schematic representation of the present utility model;

Fig. 3 is Fig. 2 section right view;

Fig. 4 is a source switch drive mechanism enlarged drawing.

Among the figure, 1-case lid, 2-source motor, the little main pulley of 3-, the little synchronous band of 4-, 5-little from belt wheel, the little leading screw of 6-, 7-primary nut, 8-base, 9-switch motor, the big main pulley of 10-, 11-big band, 12-synchronously greatly from belt wheel, the big leading screw of 13-, 14-big nut, 15-source switch, 16-guide rail, 17-guide rail bracket, 18-collimator, 19-radioactive source, 20-fixed cap, 21-inner shield piece, 22-external shield piece, 23-casing, 24-left rotary shaft, 25-right spindle.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in Figure 1 and Figure 2, this utility model comprises

Comprise external shield piece 22 is installed in the casing 23 according to this from outside to inside, inner shield piece 21, source switch 15, base 8 is equipped with in external shield piece 22 upper ends in the case lid 1, little leading screw 6 is housed on the base 8, one group is stretched in the inner shield piece 21 by fan-shaped distribution and with a end that collimator 18 aligned radioactive sources 19 are contained in little leading screw 6, little leading screw 6 other ends expose outside base 8, base 8 slides by bearing and primary nut 7, primary nut 7 and little leading screw 6 are formed lead screw pair, little fixing from belt wheel 5 and primary nut 7, little from belt wheel 5 through little synchronously with 4) link to each other with little main pulley 3 on being contained in source motor 2, be contained in the big main pulley 10 of switch motor 9 warps in the case lid 1, big synchronously with 11 be contained in big leading screw 13 on link to each other from belt wheel 12 greatly, be fixed with big nut 14 on the lower surface of source switch 15, big nut 14 is formed lead screw pair with big leading screw 13, source switch 15 tops that are arranged in inner shield piece 21 have breach, be fixed with guide rail 16 on the bottom surface of source switch 15, guide rail 16 matches with guide rail bracket 17 on the inner bottom surface that is fixed on casing 23.

The 9 energising work of switch motor are by big main pulley 10, be with 11 to drive greatly from belt wheel 12 rotations greatly synchronously; Fixing from belt wheel 12 and big leading screw 13 greatly, big leading screw 13 and big nut 14 are formed lead screw pair; The rotation of big leading screw 13 drives the source switch 15 that is fixed with big nut 14 and moves on guide rail 16, opens source switch.

Then, the 2 energising work of source motor, by little main pulley 3, little be with synchronously 4 drive little of belt wheel 5 rotations; Little fixing from belt wheel 5 and primary nut 7, primary nut 7 and little leading screw 6 are formed lead screw pair; The rotation of primary nut 7 drives little leading screw 6 and moves downward vertically, and fixed radioactive source 19 arrives the plane of collimator 18 up to little leading screw 6 tops, and makes the collimating aperture central lines of the centrage and the collimator 18 of radioactive source 19, enters duty.

Otherwise the reverse rotation of switching on according to this of source motor 2, switch motor 9 is upwards vertically mentioned radioactive source 19 and is closed source switch, enters masked state.

Inner shield piece 21, source switch 15 materials are nuclear screening material uranium 238, base 8, external shield piece 22, collimator 18 materials are high density shielding material tungsten 95, do the weight that shielding material can alleviate radiation appliance greatly with uranium 238, tungsten 95, make the radiation appliance miniaturization.Case lid 1 and casing 23 are cast iron enclosed type shell, make radiation appliance become as a whole.

The radiation appliance both sides, left rotary shaft 24 and right spindle 25 are installed respectively, in the split box seat of the main frame of easily radiation appliance being packed into, also can take off radiation appliance easily and carry out the strange land dress and change the source from the center of gravity place.

Claims

1. gamma ray radiator, it is characterized in that: comprise external shield piece (22) is installed in the casing (23) according to this from outside to inside, inner shield piece (21), source switch (15), base (8) is equipped with in external shield piece (22) upper end in the case lid (1), little leading screw (6) is housed on the base (8), one group is stretched in the inner shield piece (21) by fan-shaped distribution and with a end that the aligned radioactive source of collimator (18) (19) is contained in little leading screw (6), little leading screw (6) other end exposes outside base (8), base (8) slides by bearing and primary nut (7), primary nut (7) and little leading screw (6) are formed lead screw pair, little fixing from belt wheel (5) and primary nut (7), for a short time, link to each other with little main pulley (3) on being contained in source motor (2) through little synchronous band (4) from belt wheel (5), be contained in the big main pulley (10) of switch motor (9) warp in the case lid (1), linking to each other from belt wheel (12) greatly on being with (11) greatly synchronously and being contained in big leading screw (13), be fixed with big nut (14) on the lower surface of source switch (15), big nut (14) is formed lead screw pair with big leading screw (13), source switch (15) top that is arranged in inner shield piece (21) has breach, be fixed with guide rail (16) on the bottom surface of source switch (15), guide rail (16) matches with guide rail bracket (17) on the inner bottom surface that is fixed on casing (23).

2. a kind of gamma ray radiator according to claim 1, it is characterized in that: inner shield piece (21), source switch (15) material are nuclear screening material uranium 238, and base (8), external shield piece (22), collimator (18) material are high density shielding material tungsten 95.

3. a kind of gamma ray radiator according to claim 1 is characterized in that: the both sides at casing (23) are equipped with left rotary shaft (24), right spindle (25) respectively from focus point.