Radiation head

FIELD: radiation engineering; devices for controlling particle flux or electromagnetic radiation using collimator for the purpose.

SUBSTANCE: proposed radiation head has radiation source holder installed in fixed housing made of absorbing material with biological-shield wicket gate joined with its cylindrical sliding surface and labyrinth collimating surface which form ball in closed position; wicket gate pivot is located in center of cylindrical surface of housing. In addition, set of filters separately mounted in stepped spline guides of housing is attached radially relative to common pivot, butt-ends of filters being congruent to housing collimating channel surface; holder is provided with blind pocket in butt-end opposite to source which has through slit to receive telescopic lock damper; the latter is mounted on rod whose spring-loaded flange is loosely mounted inside supporting grip; each filter is separately secured on double-arm positioning lever.

EFFECT: enlarged capabilities of dosing radiation power, enhanced radiation safety in head servicing and storage.

3 cl, 4 dwg

 

The invention relates to the field of radiation equipment, and more particularly to devices for control of flow of particles or electromagnetic radiation using a collimator.

In the prior art of this region known radiation head containing a radiation source mounted in the holder, and biological protection ball-shape, consisting of a fixed housing and a rotating unit (see, for example, patent US 3316406, NAT. CL 250-106, 1967 and SU 1774299, G 01 T 7/00, 1992), which are characterized by complexity of construction with extra protection mechanism and the limited control range collimating channel for dispensing the radiation level.

Noted shortcomings in the design of the radial head, the selected number of matching characteristics as the closest analogue, which is described in the invention SU 698439, G 21 K 1/02,1982

Known radiation head holder contains a radiation source and biological protection of the absorbing material, comprising a fixed housing and mated with him cylindrical sliding surfaces and labyrinth surface collimating channel rotary shutter and the housing with gate in close position comprise ball and the axis of rotation of the shutter is placed in the center of the cylindrical surface of the shell.

When turning the bolt in the extreme upper position is formed collimation channel with symmetric angle of the solution on top, located in the center of the axis of rotation of the shutter, through which spatially shaped beam of radiation is output to the outside. Collimation channel in the plane perpendicular to the axis of symmetry of the corner solution, has a rectangular shape.

The radiation source is located on the axis collimating channel and fixed in the holder relative to the stationary housing.

Thus, in the described radiation head contains a minimum of moving parts, technologically advanced and easy to manufacture.

However, a disadvantage of the known radiation head is unsatisfactory protection against radiation because of the inevitable backlash in the movable connection forming a rotary shutter with housing, through which there is a constant leakage of particles from the emitter.

In addition, in this device it is not possible to regulate and measure the level of radiation, which limits the technological possibility of using non-generic radiation head.

Task to be solved by the present invention is directed, is the expansion of technological capabilities functionally reliable radiation head at improving security in the service the service address.

The required technical result is achieved by the fact that in the known radiation to the head, containing the holder of a radiation source mounted in a stationary housing made of an absorbing material, with a cylindrical sliding surface and labyrinth collimation surface which carries the rotary shutter biological protection components in close position the ball, with the axis of rotation of the shutter placed in the center of the cylindrical surface of the sliding housing, according to the invention, the shutter is advanced radially relative to the common axis of rotation, docked set of filters, Autonomous mounted in a stepped slotted guide body, and the ends of the filters, each of which is Autonomous fixed on the two shoulders of the lever positioning made congruent surface collimating channel of the housing and the holder otherwise the source end is equipped with a dull pocket with pass-through slot groove under the gate valve telescopic retainer fixed to the stem, and a spring-loaded rod flange freely placed inside the supporting handle.

Distinctive features has led to the expansion of technological capabilities functionally reliable devices with increasing radiation safety office address.

Equipping the shutter dial avtonomna the x filter allows you slowly to regulate the power of the radiation through collimation channel for different measuring, calibration and other works, in particular for the evaluation of the dosimeters.

Set filters on the total shutter rotation axis provides gapless Autonomous movement in a radial direction relative to collimating channel housing that allows you to readjust the device in a wide range of power radiated energy.

The adjunction of filters to speed labyrinth surface collimating channel housing congruent ends ensures safe locking of the radiation in the closed position of the shutter, acting as an additional level of biological protection for staff.

Placing filters in radial guides their movements made in the form of stepped slots, creates additional shielding formed in the collimator housing of the radiation beam on each side.

Execution at the rear end of the holder deaf pocket with a slit through the groove under the gate valve retainer allows mechanically secure the radiator in the housing during operation, storage and transportation, as well as remotely and securely overload emitter in the container, which is opposed to the source end of the holder is installed within the processing building radiation head.

Install spring-loaded gate valve retainer with the ability ol the longitudinal and radial movement relative to the support handle according to him the functions of the telescopic constipation, which is the power and positive locking of the holder carrying the radiation source within a stationary casing. This ensures mistressjanet down and ease his grip holder for fastening on the body, which is essential when working with radioactive materials emitter.

Therefore, every significant topic are needed, and their combination is sufficient to achieve novelty quality, extrinsic signs of dissociation, that is supplied in the invention technical problem is solved with the effect of the amount of characteristics, and not due to the amount of their effects.

The comparative analysis of proposed technical solutions to identified analogues of the prior art from which the invention not obvious to a person skilled in radiation technique, showed that it is not known, and given opportunities for industrial mass production of radiation heads, it is possible to conclude that compliance with the criteria of patentability.

The invention is illustrated by drawings, which shows:

figure 1 - proposed radiation head;

figure 2 is a section along a-a in figure 1;

figure 3 - radiation head in the working position (option);

figure 4 - type I in figure 2.

Radiation head includes massive body 1 of the absorbing radiation material, mounted on the base 2. Inside a fixed housing 1 is mounted and fixed to the holder 3 source 4 radiation (figure 2).

Otherwise, the source 4, the end face holder 3 is made hollow pocket 5 with a slit through the groove 6 under the gate valve 7 telescopic retainer 8 (figure 4).

Gate valve 7 telescopic retainer 8, made in the form of push the rotary knob has the profile of the groove 6 (guaranteed gap) and fixed to the rod 9, which bears on the end flange 10, placed freely in the bearing support 11.

Between the support 11 and the flange 10 is installed spring 12.

In the housing 1 is made labyrinth collimation channel 13 (Fig 1 and 3), on a stepped surface which assasino are absorbing elements: shutter 14 and a set of offline filter 15 having a different thickness.

The rotary shutter 14 in the position overlapping with the surface collimating channel 13 complements the shape of the hull 1 to a globe in the centre of which is a source 3, thereby providing almost equal in the amount of shielding from radiation.

The labyrinth channel 13 of stepped form with fixed shutter 14 and filter 15 is almost completely eliminates leakage of radioactive particles from the body 1 of the device, as judged by the lack along the connector ionizing field (glow)that begot the Horno impact on staff working conditions.

The shutter 14 is mounted on the casing 1 by means of a lever 16 mounted on the axis 17 of rotation, and is adjacent to the cylindrical surface 18 of the slide, the center of which coincides with the axis 17.

Filters 15 are installed independently in a stepped slotted guide 19 of the housing 1, having a radial shape centered on the common axis 17 of rotation, ensuring the locking of the radiation source 3 in the vertical direction within collimating channel 13.

Filters 15 separately fixed on the two shoulders of the levers 20, which are mounted on a common axis 17 of rotation.

The holder 3 with the radiation source 4 in the radiation head is loaded with a long rod having described sliding flap 17 on the end, through the open collimation channel 13 when the shutter 14 and all the filters 15 allotted up. Overload is carried out from the ball storage capacity with an axial channel, where the holder 3 is in position, when the source 4 is placed inside and the pocket 5's surface.

After placement of the holder 3 in the housing 1 on the labyrinth surface of the channel 13 is lowered, the shutter 14 and the filters 15 by means of the levers 16 and 20, respectively, and technological rod by turning the valve 7 disconnect when combining the latter with a through groove 6.

Then, focusing the gate valve 7 telescopic retainer 8 and the through groove 6 karma is a 5, bearing 11 mounted on the end face holder 3. Further pressing on the flange 10, compressing the spring 12, the stem 9 of the valve 7 serves inside the pocket 5, where it turns 90 degrees, then the load from the flange 10 is removed. As a result, under the action of the spring 12, the rod 9 is returned to its original position to lock the valve 7 in the end wall of the pocket 5 from the inside, kinematically closing telescopic latch 8 with the holder 3.

Thus the geometric and force closure of the holder 3 in the housing 1, that is, fixing the position of the source 4 is relatively collimating channel 13.

Functions of the radiation head is as follows. For the formation of collimating channel 13 gate 14 through a two-position lever 16 is moved to its extreme upper position (figure 2).

However, depending on the technical conditions and requirements on the power of the output beam of ionizing radiation (radioactive particles), open a specified number of filters 15, rhythmically changing the coefficient of absorption of radiation.

In the extreme upper position of the selected filters 15 are moved by rotation of the respective two shoulders of the lever 20 about the axis 17, with the filters 15 radially move along the cylindrical sliceby guides 19 of the housing 1.

For completion of the shutter 14 and filter the s 15 is returned to the degrees of the channel 13 in the reverse sequence.

Overload holder 3 source 4 radiation from the radiation head in the container storage and transportation is carried out by the operator without direct contact with the use of extensive technological boom, equipped with a gate valve 7. Previously from the pocket 5 of the holder 3 telescopic pull the latch 8.

Then roll the container orienting channel storage-axis collimating channel 13, adjacent to the radiation head.

Next, the gate valve 7 technological boom, focusing on cross-cutting delavau groove 6, kinematically complete deep in the pocket 5 rear side of the holder 3. After rising to its extreme upper position of the shutter 14 and all the filters 15 technological rod holder 3 is pushed through the open collimation channel 13 of the radiation head in the axial channel of the container storage and transportation, where the source 4 is located in the center of his ball form.

By turning the process of the valve rod 7 is combined with the groove 6 and is removed from engagement with the pocket 5 of the holder 3, freely extracting from the ball container, the depth of the absorbing mass biological protection which is the source 4 is overloaded holder 3.

A prototype of the proposed radiation head has passed the test for compliance with requirements N the RM radiation safety (NRB-99) and Basic sanitary rules of radiation safety JV 2.6.1.799-99, approved by the RF Ministry of health in 2000, when used in laboratory instrumentation and overload holder of the source container storage and transportation.

1. Radiation head with the holder of the radiation source, mounted in a stationary housing made of an absorbing material, with a cylindrical sliding surface and labyrinth collimation surface which carries the rotary shutter biological protection components in close position the ball, with the axis of rotation of the shutter placed in the center of the cylindrical surface of the housing, characterized in that the shutter is advanced radially relative to the common axis of rotation docked set of filters, Autonomous mounted in a stepped slotted guide body, and the ends of the filters are made congruent surface collimating channel of the housing and the holder otherwise the source end is equipped with a dull pocket with pass-through slot groove in sliding telescopic damper release.

2. Radiation head according to claim 1, characterized in that the gate valve retainer mounted on the shaft, a spring-loaded flange which is freely placed inside the supporting handle.

3. Radiation head according to claim 1, characterized in that each filter Autonomous fixed on the two shoulders of the lever positioning.



 

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