Quality Control method for Background Sample Preparation
Dispense 10 mL Ultima Gold LLT sample into a 20 mL plastic vial. Prepare three separate samples.
To each sample add 10mL "dead water" and shake to form a clear mixture.
Place the vials in the LSC counter at 14 to 16 Celsius and leave for 3 hours to temperature and light adapt.
Standard Preparation
Dispense 10 mL Insta-Gel Plus sample into a 20 mL plastic vial. Prepare three separate samples.
To each sample add 10 mL "dead water" and shake to form a clear mixture.
Place the vials in the LSC counter at 14 to 16 Celsius and leave for 3 hours to temperature and light adapt.
Count Conditions
| Instrument |
Packard Tri-Carb 2250 (with Ultra Low Level) |
| Count Mode |
Low level count mode |
| Temperature |
14 to 16 °C |
| Vials |
Super Polyethylene Vial - 20mL (# 6001085) . |
| Windows |
0.5 to 5.0 keV, 0 to 18.6 keV and 20 to 1,400 keV |
| Count Time |
120 minutes per sample and two cycles completed |
| Cocktail volume |
10.0 mL |
| Sample |
10.0 mL "dead water". |
Specification
Ultima Gold LLT sample background in all three counting windows must be less than that shown by the standard Insta-Gel Plus prepared and counted under the same conditions.
このように相対的な規格を採用していますが、以下のようなバックグラウンドの製品が過去に出荷されています。
Ultima Gold LLT - background results
| |
Background（cpm） |
| Lot Number |
0.5 - 5.0 keV |
0.0 - 18.6 keV |
20 - 1400 keV |
| 97-090101 |
3.13 |
6.19 |
7.38 |
| 97-090102 |
2.76 |
5.84 |
7.11 |
| 97-090201 |
2.75 |
5.72 |
7.31 |
| 97-090301 |
3.10 |
6.06 |
7.13 |
| 97-090401 |
2.74 |
5.63 |
6.88 |
| 97-090501 |
2.79 |
5.67 |
7.10 |
| 97-090602 |
2.83 |
5.68 |
7.12 |
|
