TWI413793B - A method of radioactivity measurement for distinguishing dose from different direction - Google Patents
A method of radioactivity measurement for distinguishing dose from different direction Download PDFInfo
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Abstract
Description
本發明是有關於一種區分不同方向劑量的量測方法，尤指一種可不需得知隔板之厚度或材質，而僅需使用可產生衰減之適當材質及厚度之隔板，即可進行量測達到區分不同方向劑量之功效者。The invention relates to a measuring method for distinguishing doses in different directions, in particular to measure the thickness or material of the separator, and only need to use a separator of suitable material and thickness which can generate attenuation, and then measure To achieve the effect of distinguishing doses in different directions.
在輻射環境包括核設施內部，對一些檢測點的劑量率量測是常被執行的，而目前所使用之量測設備係包括有偵檢器或TLD，然而不論使使用偵檢器或TLD，其所量測到的值是該檢測點受到各方向的劑量率總和。In radiation environments, including nuclear facilities, dose rate measurements for some test points are often performed, and currently used measurement devices include detectors or TLDs, however, regardless of the use of a detector or TLD, The measured value is the sum of the dose rates of the detection points in all directions.
而在某些情況下，有必要評估該檢測點的劑量率在不同方向的貢獻各是多少，例如：在核設施除役過程，某方向的組件及設備的拆除或移動會對檢測點的劑量率造成多少影響，這些評估需要由該檢測點來自各方向的劑量率的資訊來分析，而該檢測點來自各方向的劑量率很難由一般之量測得到，因而需使用一些新的量測方法或量測設備來得到，進而產生有下列之缺失：目前使用之偵檢器有些具有方向性，但該方向性是指偵檢器對來自不同方向的劑量測得數值會有些不同，例如：來自前方的劑量可量測到100%，來自側邊可量到80%，這些可由儀器的校正報告得到該資訊，但基本上偵檢器還是量測來自各方向劑量總合，所以偵檢器的量測並無法區分檢測點的劑量率來自不同方向的貢獻各是多少。In some cases, it is necessary to assess the contribution of the dose rate of the test point in different directions. For example, in the decommissioning process of a nuclear facility, the removal or movement of components and equipment in a certain direction will be the dose at the test point. How much impact is the rate, these assessments need to be analyzed by the information of the dose rate from the direction of the detection point, and the dose rate from the direction of the detection point is difficult to be measured by the general measurement, so some new measurements are needed. The method or measurement device is used to obtain the following defects: the detectors currently used are somewhat directional, but the directionality means that the detectors have different values for the doses from different directions, such as : The dose from the front can be measured to 100%, and the amount from the side can be up to 80%. These can be obtained from the calibration report of the instrument, but basically the detector still measures the total dose from all directions, so the detection The measurement of the device does not distinguish the contribution of the dose rate from the different directions.
目前使用之TLD是接受通過該檢測點之各方向累積劑量，也無法區分來自不同方向的劑量。The TLD currently in use accepts doses in all directions through the test point and does not distinguish between doses from different directions.
架設厚重屏蔽阻擋其他方向劑量，只量測單一方向劑量是可行，但須準備厚重屏且蔽操作不便，有些狹小地方更無法做到。It is feasible to set up a heavy shielding to block the dose in other directions. It is feasible to measure only the single direction dose, but it is necessary to prepare a thick screen and the operation is inconvenient, and some narrow places are even more impossible.
本發明之主要目的係在於，不需得知隔板之厚度或材質，而僅需使用可產生衰減之適當材質及厚度之隔板，即可達到量測之功效。The main purpose of the present invention is to achieve the measurement effect without knowing the thickness or material of the separator, and only using a separator of suitable material and thickness which can produce attenuation.
為達上述之目的，本發明係一種區分不同方向劑量的量測方法，於第一實施例中係包含有下列步驟：In order to achieve the above object, the present invention is a measuring method for distinguishing doses in different directions, and in the first embodiment, the following steps are included:
步驟一：於一檢測點位置，進行使用單層隔板的量測，測量隔板上方及下方兩側表面的劑量，藉以獲得單層隔板上方量測值以及單層隔板下方量測值，而隔板放置方向面向上方及下方。Step 1: At the position of a detection point, the measurement of the single-layer separator is performed, and the doses on the upper and lower sides of the separator are measured to obtain the measurement value above the single-layer separator and the measurement value under the single-layer separator. The partition is placed facing upwards and downwards.
步驟二：於此一檢測點，進行使用雙層隔板的量測，測量隔板上方及下方兩側表面的劑量，藉以獲得雙層隔板上方量測值以及雙層隔板下方量測值，而隔板放置方向面向上方及下方。Step 2: At this detection point, the measurement using the double-layer separator is performed, and the doses on the upper and lower sides of the separator are measured to obtain the measurement value above the double-layer separator and the measurement value under the double-layer separator. The partition is placed facing upwards and downwards.
步驟三：於同一檢測點進行無隔板劑量量測，藉以獲得無隔板量測值。Step 3: Perform a non-separator dose measurement at the same inspection point to obtain a non-separator measurement value.
步驟四：依據量測值計算出來自上方劑量、來自下方劑量與來自側邊劑量。Step 4: Calculate the dose from the top, the dose from the bottom, and the dose from the side based on the measured values.
而於本發明之第二實施例中，係包含有下列步驟：In the second embodiment of the present invention, the following steps are included:
步驟一：於檢測點位置，進行使用隔板的量測，測量隔板上方及下方兩側表面的劑量，藉以獲得隔板上方量測值以及隔板下方量測值，而隔板放置方向面向上方及下方。Step 1: At the position of the detection point, perform the measurement using the separator, measure the dose on the upper and lower sides of the separator, and obtain the measured value above the partition and the measured value under the partition, and the partition is oriented Above and below.
步驟二：另於同一檢測點進行無隔板劑量量測，得無隔板量測值。Step 2: Another non-separator dose measurement is performed at the same inspection point, and no separator measurement value is obtained.
步驟三：計算得出來自上方劑量及來自下方劑量。Step 3: Calculate the dose from the top and the dose from below.
請參閱『第1圖』所示，係為本發明第一實施例之示意圖。如圖所示：本發明係一種區分不同方向劑量的量測方法，可將檢測點之劑量來源區分來自上方劑量X、下方劑量Y及側邊劑量Z(週圍劑量)，且其至少包含下列之實施步驟：Please refer to FIG. 1 for a schematic view of the first embodiment of the present invention. As shown in the figure: the present invention is a measuring method for distinguishing doses in different directions, and the dose source of the detecting points can be distinguished from the upper dose X, the lower dose Y and the side dose Z (surrounding dose), and at least the following Implementation steps:
步驟一：於一檢測點10位置，進行使用單層隔板11的量測，測量隔板11上方及下方兩側表面的劑量，藉以獲得單層隔板11上方量測值a以及單層隔板11下方量測值b，而隔板11放置方向面向上方及下方，並同時隔板11對來自上方的劑量造成衰減比例μ以及隔板11對來自下方的劑量造成衰減比例λ。Step 1: At the position of the detection point 10, the measurement using the single-layer separator 11 is performed, and the doses on the upper and lower sides of the separator 11 are measured to obtain the measured value a above the single-layer separator 11 and the single-layer partition. The value b is measured below the plate 11, and the partitioning direction of the partition 11 faces upward and downward, and at the same time, the partition 11 causes a damping ratio μ to the dose from above and the partition 11 causes a damping ratio λ to the dose from below.
步驟二：於此一檢測點10，進行使用雙層隔板12的量測，測量隔板12上方及下方兩側表面的劑量，藉以獲得雙層隔板12上方量測值d以及雙層隔板12下方量測值e，而隔板12放置方向應面向上方及下方，並同時雙層隔板12對來自上方的劑量造成衰減比例μ2 以及隔板12對來自下方的劑量造成衰減比例λ2 。Step 2: At the detection point 10, the measurement of the double-layer separator 12 is performed, and the doses on the upper and lower sides of the separator 12 are measured to obtain the measured value d and the double-layer partition above the double-layer separator 12. The value e is measured below the plate 12, and the partition 12 is placed facing upward and downward, and at the same time, the double-layer separator 12 causes an attenuation ratio μ 2 to the dose from above and the partition 12 causes a decay ratio of the dose from below. 2.
步驟三：於同一檢測點10進行無隔板劑量量測，藉以獲得無隔板量測值c。Step 3: Perform a non-separator dose measurement at the same inspection point 10 to obtain a non-separator measurement value c.
步驟四：依據量測值計算出來自上方劑量X、來自下方劑量Y與來自側邊劑量Z，分別說明於下：Step 4: Calculate the dose X from the upper dose, the dose Y from the lower side and the dose Z from the side according to the measured values, respectively, as follows:
將步驟一至步驟三之量測的關係式加以彙整，可獲得：By combining the measured relationships from step one to step three, you can obtain:
單層隔板上方量測值a=上方劑量X+下方來的劑量衰減比例λ×下方劑量Y+側邊劑量Z，即配合圖示可表示出a=X+λ×Y+Z。The measured value a above the single-layer separator is the dose attenuation ratio λ × the lower dose Y + the side dose Z below the upper dose X+, that is, the matching diagram can show a=X+λ×Y+Z.
單層隔板下方量測值b=上方的劑量衰減比例μ×上方劑量X+下方劑量Y+側邊劑量Z，即配合圖示可表示出b=μ×X+Y+Z。The measured value b = the upper dose attenuation ratio μ × the upper dose X + the lower dose Y + the side dose Z below the single layer separator, that is, the figure shows that b = μ × X + Y + Z.
無隔板量測值c=上方劑量X+下方劑量Y+側邊劑量Z，即配合圖示可表示出c=X+Y+Z。No separator measurement c = upper dose X + lower dose Y + side dose Z, that is, with the illustration, c = X + Y + Z can be expressed.
雙層隔板上方量測值d=上方劑量X+下方來的劑量衰減比例λ2 ×下方劑量Y+側邊劑量Z，即配合圖示可表示出d=X+λ2 ×Y+Z。The measured value d above the double-layer partition is the dose attenuation ratio λ 2 × the lower dose Y + the side dose Z below the upper dose X+, that is, the figure shows that d=X+λ 2 ×Y+Z.
雙層隔板下方量測值e=上方的劑量衰減比例μ2 ×上方劑量X+下方劑量Y+側邊劑量Z，即配合圖示可表示出e=μ2 ×X+Y+Z。The measured value e = the dose attenuation ratio above the double-layer baffle μ 2 × the upper dose X + the lower dose Y + the side dose Z, that is, the figure shows that e = μ 2 × X + Y + Z.
再依據上述五個未知數(X、Y、Z、μ、λ)，而利用五個方程式以下列方式解出五個未知數可以得到：Based on the above five unknowns (X, Y, Z, μ, λ), five equations can be solved by using five equations in the following way:
當計算上方劑量X時，係以來自上方劑量X=(無隔板量測值c-單層隔板下方量測值b)2 /(無隔板量測值c+雙層隔板下方量測值e-2×單層隔板下方量測值b)，即配合圖示可表示出X=(c-b)2 /(c+e-2×b)。When the dose is calculated over the X, from the top line to dose X = (value measured without separator separator c- monolayer amount below the measurement value b) 2 / (measured value no partition c + measured amount below the double-layered separator The value e-2 × the measured value b) under the single-layer separator, that is, the matching diagram can show that X = (cb) 2 / (c + e - 2 × b).
當計算下方劑量Y時，係以來自下方劑量Y=(無隔板量測值c-單層隔板上方量測值a)2 /(無隔板量測值c+雙層隔板上方量測值d-2×單層隔板上方量測值a)，即配合圖示可表示出Y=(c-a)2 /(c+d-2×a)。When the lower dose Y is calculated, the dose from the lower dose Y = (no separator measurement c - the measured value a above the single-layer separator a) 2 / (no separator measurement c + above the double-layer separator) The value d-2 × the measured value a) above the single-layer separator, that is, the figure shows Y=(ca) 2 /(c+d-2×a).
當計算側邊劑量Z時，係以來自側邊劑量Z=無隔板量測值c-來自上方劑量X-來自下方劑量Y，即配合圖示可表示出Z=c-X-Y。When calculating the side dose Z, it is derived from the side dose Z = no separator measurement c - from the upper dose X - from the lower dose Y, that is, Z=c-X-Y can be represented by the illustration.
請參閱『第2圖』所示，係為本發明第二實施例之示意圖。如圖所示：本發明除上述第一實施例所提方法之外，若輻射環境單純，射源只來自上、下兩側，即僅區分來自上方劑量X及下方劑量Y，且輻射主要核種相同則步驟可簡化如下：Please refer to FIG. 2, which is a schematic view of a second embodiment of the present invention. As shown in the figure: in addition to the method of the first embodiment described above, if the radiation environment is simple, the source is only from the upper and lower sides, that is, only the upper dose X and the lower dose Y are distinguished, and the main nuclear species are irradiated. The same steps can be simplified as follows:
步驟一：於檢測點20位置，進行使用隔板21的量測，測量隔板21上方及下方兩側表面的劑量，藉以獲得隔板21上方量測值a以及隔板21下方量測值b，而隔板放置方向應面向上方及下方，並同時隔板21對來自上、下方劑量造成衰減比例μ。Step 1: At the position of the detection point 20, the measurement using the partition plate 21 is performed, and the doses on the upper and lower sides of the partition plate 21 are measured to obtain the measured value a above the partition 21 and the measured value below the partition plate b. The partitioning direction should face upward and downward, and at the same time, the partition 21 causes an attenuation ratio μ from the upper and lower doses.
步驟二：另於同一檢測點20進行無隔板劑量量測，而獲得無隔板量測值c。Step 2: Perform a non-separator dose measurement at the same inspection point 20 to obtain a separatorless measurement value c.
步驟三：依據量測值計算得出來自上方劑量X及來自下方劑量Y，分別說明於下：Step 3: Calculate the upper dose X and the lower dose Y based on the measured values, respectively, as follows:
因無側邊的劑量，且上方劑量X及下方劑量Y的主要核種一樣，方向是一直線方向(表示在隔板內路徑的行程距離一樣)，所以隔板21對上方與下方衰減程度一樣，因此將步驟一及步驟二之量測的關係式加以彙整，可獲得以下關係式：Since there is no side dose, and the upper dose X is the same as the main nuclear species of the lower dose Y, the direction is the straight line direction (indicating the same travel distance of the path in the partition), so the partition 21 has the same degree of attenuation for the upper and lower sides, so By combining the measured relationships of steps 1 and 2, the following relationship can be obtained:
隔板上方量測值a=上方劑量X+上、下方劑量衰減比例μ×下方劑量Y，即配合圖示可表示出a=X+μ×Y。The measured value a above the upper plate = the upper dose X + the upper and lower dose attenuation ratio μ × the lower dose Y, that is, the figure shows that a = X + μ × Y.
隔板下方量測值b=上、下方劑量衰減比例μ×上方劑量X+下方劑量Y，即配合圖示可表示出b=μ×X+Y。The measured value b below the separator is the upper and lower dose attenuation ratio μ × the upper dose X + the lower dose Y, that is, the figure shows that b=μ×X+Y.
而無隔板的量測值c之關係式為上方劑量X+下方劑量Y，即配合圖示可表示出c=X+Y。The relationship between the measured value c without the partition is the upper dose X + the lower dose Y, that is, the figure shows that c = X + Y.
藉由上述之由三方程式解，三未知數(X、Y、μ)得到：By the above three equations, the three unknowns (X, Y, μ) are obtained:
上方劑量X=(無隔板量測值c2 -下方量測值b×無隔板量測值c)/(2×無隔板量測值c-上方量測值a-下方量測值b)，即配合圖示可表示出X=(c2 -b×c)/(2×c-a-b)。Upper dose X = (no separator measurement c 2 - lower measurement b × no separator measurement c) / (2 × no separator measurement c - upper measurement a - lower measurement b), that is, with the illustration, X = (c 2 - b × c) / (2 × cab).
下方劑量Y=(無隔板量測值c2 -上方量測值a×無隔板量測值c)/(2×無隔板量測值c-上方量測值a-下方量測值b)，即配合圖示可表示出Y=(c2 -a×c)/(2×c-a-b)。Lower dose Y=(no separator measurement c 2 - upper measurement a × no separator measurement c) / (2 × no separator measurement c - upper measurement a - lower measurement b), that is, with the illustration, Y = (c 2 - a × c) / (2 × cab).
綜上所述，本發明一種區分不同方向劑量的量測方法可有效改善習用之種種缺點，不需得知隔板之厚度或材質，而僅需使用可產生衰減之適當材質及厚度之隔板，即可達到量測之功效；進而使本發明之產生能更進步、更實用、更符合消費者使用之所須，確已符合發明專利申請之要件，爰依法提出專利申請。In summary, the measuring method for distinguishing doses in different directions can effectively improve various disadvantages of the conventional use, and it is not necessary to know the thickness or material of the partition, but only the partition material of appropriate material and thickness which can generate attenuation is needed. The effect of the measurement can be achieved; furthermore, the invention can be made more progressive, more practical, and more in line with the needs of the consumer, and has indeed met the requirements of the invention patent application, and the patent application is filed according to law.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍；故，凡依本發明申請專利範圍及發明說明書內容所作之簡單的等效變化與修飾，皆應仍屬本發明專利涵蓋之範圍內。However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.
10、20．．．檢測點10, 20. . . check Point
11．．．單層隔板11. . . Single layer partition
12、21．．．雙層12, 21. . . Double layer
a．．．單層隔板上方量測值a. . . Measurement value above the single layer separator
b．．．單層隔板下方量測值b. . . Measurement under the single layer partition
c．．．無隔板量測值c. . . No separator measurement
d．．．雙層隔板上方量測值d. . . Measurement above the double baffle
e．．．雙層隔板下方量測值e. . . Measurement under the double partition
μ．．．單層隔板對來自上方的劑量衰減比例μ. . . Single layer separator pair dose attenuation ratio from above
λ．．．單層隔板對來自下方的劑量衰減比例λ. . . Single layer separator pair dose attenuation ratio from below
μ2 ．．．雙層隔板對來自上方的劑量衰減比例μ 2 . . . Double-layer separator pair dose attenuation ratio from above
λ2 ．．．雙層隔板對來自下方的劑量衰減比例λ 2 . . . Double-layer separator for dose attenuation ratio from below
X．．．來自上方劑量X. . . From above dose
Y．．．來自下方劑量Y. . . From below dose
Z．．．來自側邊劑量Z. . . From the side dose
μ．．．隔板對上、下方劑量衰減比例μ. . . The dose attenuation ratio of the upper and lower sides of the separator
第1圖，係本發明第一實施例之示意圖。Fig. 1 is a schematic view showing a first embodiment of the present invention.
第2圖，係本發明第二實施例之示意圖。Fig. 2 is a schematic view showing a second embodiment of the present invention.
10．．．檢測點10. . . check Point
11．．．單層隔板11. . . Single layer partition
12．．．雙層隔板12. . . Double partition
a．．．單層隔板上方量測值a. . . Measurement value above the single layer separator
b．．．單層隔板下方量測值b. . . Measurement under the single layer partition
c．．．無隔板量測值c. . . No separator measurement
d．．．雙層隔板上方量測值d. . . Measurement above the double baffle
e．．．雙層隔板下方量測值e. . . Measurement under the double partition
μ．．．單層隔板對來自上方的劑量衰減比例μ. . . Single layer separator pair dose attenuation ratio from above
λ．．．單層隔板對來自下方的劑量衰減比例λ. . . Single layer separator pair dose attenuation ratio from below
μ2 ．．．雙層隔板對來自上方的劑量衰減比例μ 2 . . . Double-layer separator pair dose attenuation ratio from above
λ2 ．．．雙層隔板對來自下方的劑量衰減比例λ 2 . . . Double-layer separator for dose attenuation ratio from below
X．．．來自上方劑量X. . . From above dose
Y．．．來自下方劑量Y. . . From below dose
Z．．．來自側邊劑量Z. . . From the side dose
Claims (7)
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| TW99133230A TWI413793B (en) | 2010-09-30 | 2010-09-30 | A method of radioactivity measurement for distinguishing dose from different direction |
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| Publication Number | Publication Date |
|---|---|
| TW201213837A TW201213837A (en) | 2012-04-01 |
| TWI413793B true TWI413793B (en) | 2013-11-01 |
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| TW99133230A TWI413793B (en) | 2010-09-30 | 2010-09-30 | A method of radioactivity measurement for distinguishing dose from different direction |
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| TW (1) | TWI413793B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3729632A (en) * | 1970-12-21 | 1973-04-24 | Industrial Nucleonics Corp | Penetrating radiation gauge |
| EP1719970A2 (en) * | 2000-03-01 | 2006-11-08 | Plastic Technologies, Inc. | Method and apparatus for measuring wall thickness of a plastic container |
| US20080226038A1 (en) * | 2007-03-14 | 2008-09-18 | Varian Medical Systems Technologies, Inc. | Radiation System and Radiation Beam Quality Detector and Method |
| US20090010385A1 (en) * | 2005-08-03 | 2009-01-08 | Krones Ag | Method and Device for Monitoring Wall Thickness |
-
2010
- 2010-09-30 TW TW99133230A patent/TWI413793B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3729632A (en) * | 1970-12-21 | 1973-04-24 | Industrial Nucleonics Corp | Penetrating radiation gauge |
| EP1719970A2 (en) * | 2000-03-01 | 2006-11-08 | Plastic Technologies, Inc. | Method and apparatus for measuring wall thickness of a plastic container |
| US20090010385A1 (en) * | 2005-08-03 | 2009-01-08 | Krones Ag | Method and Device for Monitoring Wall Thickness |
| US20080226038A1 (en) * | 2007-03-14 | 2008-09-18 | Varian Medical Systems Technologies, Inc. | Radiation System and Radiation Beam Quality Detector and Method |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201213837A (en) | 2012-04-01 |
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