CN2715135Y

CN2715135Y - Passive HTO sampler

Info

Publication number: CN2715135Y
Application number: CN 200420077918
Authority: CN
Inventors: 杨怀元; 杨海兰; 温雪莲; 吴斌
Original assignee: China Institute for Radiation Protection
Current assignee: China Institute for Radiation Protection
Priority date: 2004-07-16
Filing date: 2004-07-16
Publication date: 2005-08-03
Anticipated expiration: 2014-07-16

Abstract

The utility model belongs to the field of radioactive gas sampling and detecting, and specifically relates to an air tritiation water vapor HTO sampler, comprising a bottle, drying agent filled in the bottle, and a bottle cap close connected with the bottle. The bottle cap is provided with a center opening communicating the bottle inside and outside, and an air filter film is provided between the center opening and the inner space of the bottle. The utility model is characterized in that during sampling, the tritium in the outside air diffuses into the bottle sampler through the opening on the top cover and is absorbed by the drying agent in the bottle without the power from outside world; besides, the passive HTO sampler has the advantages of simple structure, low cost and easy use.

Description

Passive type HTO sampler

Technical field

The utility model belongs to the sampling and the mensuration field of radgas, is specifically related to a kind of air tritiated water steam HTO sampler.

Background technology

Now the sampler of using generally all is a HTO sampler in active, the active air, generally by particle filter, spinner-type flowmeter, in order to the drying agent adsorber that captures tritium or water bubbler as absorption liquid, and aspiration pump constitutes.After sampling finishes, the tritium of drying agent absorption parsed or directly get partially absorb liquid, measure the tritium amount,, calculate the concentration of tritium in the air of asking at last divided by the sampling volume of air with the liquid flashing counting device.This sampler structure complexity, on the high side and need power resources.

Summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, cheap, easy to use, do not need tritium sampler in the air of exterior power again.

A kind of passive type HTO sampler comprises bottle, is contained in drying agent and bottle cap in the bottle, and bottle cap closely is connected with bottle; Central duct having on the bottle cap inside and outside the air expansion bottle also is provided with the air filter membrane between the interior space of central duct and bottle.

The utility model is when sampling, because tritium exists certain concentration gradient poor in the sampling jar inner air and outer air, the tritium in the outside air is diffused in the sampling jar by the duct on the sampler top cover, and is absorbed by the drying agent in the bottle.After sampling finishes, directly measure the total activity that drying agent adsorbs tritium in the counting vial with liquid scintillation counter, be multiply by by equivalent sampling rate and can obtain sampled volume of air sample time, both are divided by and can obtain the concentration of tritium in the air.Compare with other technologies, the utlity model has simple in structure, cheap, easy to use, do not need the advantage of exterior power again.

Description of drawings

Fig. 1 is a passive type HTO sampler structure synoptic diagram.

Among the figure: 1. sampling head, 2. central duct, 3. sampler Bottle cap, 4. air filter membrane, 5. bottle, 6. vacuum rubber packing ring, 7. drying agent.

Embodiment

Below in conjunction with embodiment technical scheme of the present invention is further elaborated.

As shown in the figure, tritium passive type sampler comprises bottle 5 in a kind of air.Drying agent 7 is housed in bottle 5, and drying agent 7 can be that silica gel, ethylene glycol also can be tritium-free waters.At the opening part of bottle 5, be provided with vacuum rubber packing ring 6; Bottle 5 is connected with sampler Bottle cap 3 by the screw thread that goes out at its opening, and realizes that by vacuum rubber packing ring 6 bottle 5 is connected with the airtight of sampler Bottle cap 3; Sampler Bottle cap 3 can be selected any material for use, and purpose is to guarantee that impermeability is good, and what sampler Bottle cap 3 was selected for use in this example is that surfaces externally and internally carries out the alloy aluminum that peroxidating is handled.Keep away in the sampler Bottle cap 3 and be provided with annular projection, on the projection upper inner wall, be provided with screw thread.Be provided with air filter membrane 4 on projection, air filter membrane 4 is 1 micron a filter paper for the space, and this filter paper has a lot of brands on the market, can arbitrarily select for use.Be connected with sampling head 1 by the screw thread sampler Bottle cap 3 on the groove, sampling head 1 can be selected any material for use, and purpose is to guarantee that impermeability is good, and what sampling head 1 was selected for use in this example is that surfaces externally and internally carries out the alloy aluminum that peroxidating is handled.Because the bottom of groove is provided with air filter membrane 4, so do not need other auxiliary gas checks between sampler Bottle cap 3 and the sampling head 1.On sampling head 1, have central duct 2, can change the sampling rate of HTO sampler by the size that changes central duct 2 diameters; The scope of general central duct 2 diameters can all be the numerical value that can select for use as 1 millimeter, 7 millimeters or 10 millimeters between 1 millimeter～10 millimeters.By central duct 2, extraneous air links to each other with air filter membrane 4; The air that passes air filter membrane 4 enters in the bottle 5 from the perforate on the sampler Bottle cap 3, and the agent 7 that is dried absorbs.

When needs during to air sampling, only need be placed on sampling spot to the straight power of this HTO sampler, start-of-record and the time that stops to take a sample are directly measured the tritium amount of drying agent absorption at last with counter, just can provide between sampling date the mean concentration of tritium in the air.

Claims

1. a passive type HTO sampler comprises bottle (5), is contained in drying agent (7) and bottle cap in the bottle (5), it is characterized in that bottle cap closely is connected with bottle (5); Central duct (2) having on the bottle cap inside and outside the air expansion bottle also is provided with air filter membrane (4) between the interior space of central duct (2) and bottle (5).

2. passive type HTO sampler as claimed in claim 1, it is characterized in that bottle cap by the Bottle cap (3) that is connected with bottle (5), place the air filter membrane (4) in Bottle cap (3) groove and form with the close-connected sampling head of Bottle cap (3) (1), have central duct (2) on the sampling head (1).

3. passive type HTO sampler as claimed in claim 1 or 2, the magnitude range that it is characterized in that central duct (2) diameter is within 1 millimeter～10 millimeters.

4. passive type HTO sampler as claimed in claim 1 or 2, what it is characterized in that air filter membrane (4) selects for use is that the space is 1 micron a filter paper.

5. passive type HTO sampler as claimed in claim 3, what it is characterized in that air filter membrane (4) selects for use is that the space is 1 micron a filter paper.

6. passive type HTO sampler as claimed in claim 2, what it is characterized in that sampling head (1) selects for use is that surfaces externally and internally carries out the alloy aluminum that peroxidating is handled.

7. passive type HTO sampler as claimed in claim 3, what it is characterized in that sampling head (1) selects for use is that surfaces externally and internally carries out the alloy aluminum that peroxidating is handled.