A kind of efficiency card and preparation method thereof
A technology of efficiency and na214co3, which is applied in the field of efficiency card and the preparation of the efficiency card, can solve the problems that the standard card is difficult to seal without leakage, and the counting is stable for a long time, so as to achieve long-term stable counting, improve product quality, and seal without leakage Effect
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[0029] figure 1 It is a flow chart of a preferred embodiment of the preparation method of the efficiency card, such as figure 1 As shown, the preparation method of the efficiency card of the present invention comprises the following steps:
[0030] S100, preparation 14 C source solution: use (NH 2 ) 2 14 CO or Na 2 14 CO 3 as 14 C source, formulated as (NH 2 ) 2 14 CO in ethanol or Na 2 14 CO 3 solution;
[0031] S200, dripping, drying, heat sealing: the (NH 2 ) 2 14 CO in ethanol or Na 2 14 CO 3 The solution was dropped onto a substrate in which 1.0×10 -7 ~8.0×10 -6 mCi 14 C source, after drying, use a heat-sealing film to cover the substrate.
Embodiment 1
[0032] Example 1 (NH 2 ) 2 14 Preparation method of CO efficiency card
[0033] 1 preparation (NH 2 ) 2 14 CO in ethanol
[0034] 1.1 Receive urea[ 14 C] Alcohol API, namely 14 C urea ethanol mother liquor, its concentration is 1mCi / ml. The unit millicurie (mCi) used in this embodiment can be converted into Beck (Bq) accordingly.
[0035] 1.2 use 14 C urea ethanol mother liquor and absolute ethanol dilution obtains (NH 2 ) 2 14 CO in ethanol at a concentration of 0.1 × 10 -4 ~1.6×10 -3 mCi / ml.
[0036] For example, use a 5ml pipette to pipette 1ml~5ml of absolute ethanol into a 20ml liquid scintillation vial, and pipette it with a 200μl pipette 14 C urea ethanol mother solution 50μl ~ 200μl, into the same liquid flash bottle, shake well. Mark as intermediate dilution.
[0037] Pipette 3ml~10ml of absolute ethanol with a 5ml pipette gun into another 20ml liquid scintillation vial; pipette 10μl~300μl of the intermediate dilution with a 200μl pipette gun into th...
Embodiment 2
[0050] Example 2 Na 2 14 CO 3 How to prepare an efficiency card
[0051] principle:
[0052] (NH 2 ) 2 14 CO+2NaOH=Na 2 14 CO 3 +2NH 3
[0053] Urea[ 14 C] reacts with sodium hydroxide to generate carbon [ 14 C] Sodium acid and ammonia gas. carbon[ 14 C] Sodium acid is stable in nature, carbon [ 14 C] Sodium acid solution is added dropwise on filter paper or frosted plastic hard sheet, dried and heat-sealed to obtain a sealed and stable 14 C solid source.
[0054] 1 Prepare Na 2 CO 3 the solution
[0055] 1.1 Accurately weigh some Na 2 CO 3 Powder, placed in scintillation vials, prepared with purified water to make 0.2g / ml~0.5g / ml Na 2 CO 3 solution, cap the bottle, and shake well. Mark Na 2 CO 3 Solution ①;
[0056] 1.2 Take another clean and dry scintillation vial, and accurately weigh some Na 2 CO 3 Powder, placed in scintillation vials, prepared with purified water to make 0.06g / ml~0.1g / ml Na 2 CO 3 solution, cap the bottle, and shake well. ...
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