R Rajamäe
Biographic Data
| ID | 5597373 |
|---|---|
| NAME | R Rajamäe |
| GIVEN NAMES | R |
| FAMILY NAME | Rajamäe |
| SIGNATURE | RAJAMÄE R |
| VERIFIED | No |
| TOTAL WORKS | 8 |
| TOTAL CITATIONS | 7 |
| AUTHOR COUNT | 8 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1973 |
| LATEST PUBLICATION YEAR | 1983 |
| H-INDEX | 1 |
Tallinn Radiocarbon Dates VII
This list comprises age measurements carried out at the Institute from 1979 to 1981. Anticoincidence variant was applied to attain higher counting efficiency of a 2-channel scintillation device. The introduction of a plastic scintillator as an active guard around the detector in the 2 π geometry decreases the influence of high energy cosmic radiation and reduces the background ca 35 to 75% (Rajamäe & Punning, 1980). The application of an active g…
Some Possibilities for the Development of 14 C Measurements by Liquid Scintillation Counting
The possibilities of widening the ranges of usage of scintillation counters are studied. As a result of the introduction of the active guard, the background in 14 C channel reduces 30 to 75 percent and the stability of background increases. The application of quartz vials and a plastic scintillator as an active guard establishes 14 C activity in small amounts of scintillation cocktail (up to 0.1g C) and dates samples with older ages (up to 57,000…
Tallinn Radiocarbon Dates VI
The following list includes samples dated at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1978. The measurement of natural 14 C activity is performed by 1-channel and 2-channel scintillation devices (Punning & Rajamäe, 1977). Ages are calculated using the half-life of 5568 ± 30 years and 0.95 NBS oxalic acid modern standard with ad 1950 as reference year
Tallinn Radiocarbon Dates V
The following list comprises age measurements carried out during 1976 and 1977. The activity of 14 C was computed by one- and two-channel scintillation devices (Punning et al , 1976; 1977). Ages are calculated using a half-life of 5568 ± 30 years for 14 G with NBC oxalic acid as a reference standard. All dates are reported in years before 1950. 12 C/ 13 C measurements were not performed and results are not corrected for 13 C fractionation
Tallinn Radiocarbon Dates IV
The following list includes samples dated in 1975. The measurement of 14 C activity was performed with 1-channel and 2-channel scintillation devices. Special attention was paid to the decrease of the background. The effectiveness of the measurement is ca 50% (Punning, Rajamäe, 1975). The “enriched standard” (Alekseejev et al , 1971) has been used as a contemporary reference standard of modern carbon. Age calculations are based on the 14 C half-li…
Tallinn Radiocarbon Dates III
This list comprises age measurements carried out from 1973 to 1974 In dating the samples reported here as well as in calculating their ages, the same equipment and methods were used as previously described (R, 19/3, v 15, p 586–591; 1974, v 16, p 388–394)
Tallinn Radiocarbon Dates II
The following list includes samples dated in 1973. Benzene is used as the carrier of natural 14 C activity as previously described (Punning et al , 1973). We used both 1-channel and 2-channel scintillation devices. The detector shield comprises 10cm lead. Around the detector we put 16 Geiger-Mueller type counters in anticoincidence circuit with output signals from detector. It decreased the average background ca 20 to 40
Tallinn Radiocarbon Dates I
Preparations for determining absolute age by the radiocarbon method were started at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1971. Dating of samples has been carried out since 1972
Tallinn Radiocarbon Dates I
Preparations for determining absolute age by the radiocarbon method were started at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1971. Dating of samples has been carried out since 1972
Some Possibilities for the Development of 14 C Measurements by Liquid Scintillation Counting
The possibilities of widening the ranges of usage of scintillation counters are studied. As a result of the introduction of the active guard, the background in 14 C channel reduces 30 to 75 percent and the stability of background increases. The application of quartz vials and a plastic scintillator as an active guard establishes 14 C activity in small amounts of scintillation cocktail (up to 0.1g C) and dates samples with older ages (up to 57,000…
Tallinn Radiocarbon Dates IV
The following list includes samples dated in 1975. The measurement of 14 C activity was performed with 1-channel and 2-channel scintillation devices. Special attention was paid to the decrease of the background. The effectiveness of the measurement is ca 50% (Punning, Rajamäe, 1975). The “enriched standard” (Alekseejev et al , 1971) has been used as a contemporary reference standard of modern carbon. Age calculations are based on the 14 C half-li…
Tallinn Radiocarbon Dates III
This list comprises age measurements carried out from 1973 to 1974 In dating the samples reported here as well as in calculating their ages, the same equipment and methods were used as previously described (R, 19/3, v 15, p 586–591; 1974, v 16, p 388–394)
Tallinn Radiocarbon Dates II
The following list includes samples dated in 1973. Benzene is used as the carrier of natural 14 C activity as previously described (Punning et al , 1973). We used both 1-channel and 2-channel scintillation devices. The detector shield comprises 10cm lead. Around the detector we put 16 Geiger-Mueller type counters in anticoincidence circuit with output signals from detector. It decreased the average background ca 20 to 40
Tallinn Radiocarbon Dates I
Preparations for determining absolute age by the radiocarbon method were started at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1971. Dating of samples has been carried out since 1972
Tallinn Radiocarbon Dates II
The following list includes samples dated in 1973. Benzene is used as the carrier of natural 14 C activity as previously described (Punning et al , 1973). We used both 1-channel and 2-channel scintillation devices. The detector shield comprises 10cm lead. Around the detector we put 16 Geiger-Mueller type counters in anticoincidence circuit with output signals from detector. It decreased the average background ca 20 to 40
Tallinn Radiocarbon Dates III
This list comprises age measurements carried out from 1973 to 1974 In dating the samples reported here as well as in calculating their ages, the same equipment and methods were used as previously described (R, 19/3, v 15, p 586–591; 1974, v 16, p 388–394)
Tallinn Radiocarbon Dates IV
The following list includes samples dated in 1975. The measurement of 14 C activity was performed with 1-channel and 2-channel scintillation devices. Special attention was paid to the decrease of the background. The effectiveness of the measurement is ca 50% (Punning, Rajamäe, 1975). The “enriched standard” (Alekseejev et al , 1971) has been used as a contemporary reference standard of modern carbon. Age calculations are based on the 14 C half-li…
Tallinn Radiocarbon Dates V
The following list comprises age measurements carried out during 1976 and 1977. The activity of 14 C was computed by one- and two-channel scintillation devices (Punning et al , 1976; 1977). Ages are calculated using a half-life of 5568 ± 30 years for 14 G with NBC oxalic acid as a reference standard. All dates are reported in years before 1950. 12 C/ 13 C measurements were not performed and results are not corrected for 13 C fractionation
Some Possibilities for the Development of 14 C Measurements by Liquid Scintillation Counting
The possibilities of widening the ranges of usage of scintillation counters are studied. As a result of the introduction of the active guard, the background in 14 C channel reduces 30 to 75 percent and the stability of background increases. The application of quartz vials and a plastic scintillator as an active guard establishes 14 C activity in small amounts of scintillation cocktail (up to 0.1g C) and dates samples with older ages (up to 57,000…
Tallinn Radiocarbon Dates VI
The following list includes samples dated at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1978. The measurement of natural 14 C activity is performed by 1-channel and 2-channel scintillation devices (Punning & Rajamäe, 1977). Ages are calculated using the half-life of 5568 ± 30 years and 0.95 NBS oxalic acid modern standard with ad 1950 as reference year
Tallinn Radiocarbon Dates VII
This list comprises age measurements carried out at the Institute from 1979 to 1981. Anticoincidence variant was applied to attain higher counting efficiency of a 2-channel scintillation device. The introduction of a plastic scintillator as an active guard around the detector in the 2 π geometry decreases the influence of high energy cosmic radiation and reduces the background ca 35 to 75% (Rajamäe & Punning, 1980). The application of an active g…
Radiocarbon dating (8 works) · Geology (7 works) · Archaeology (6 works) · Chemistry (6 works) · Geography (6 works) · Physics (6 works) · Radiochemistry (6 works) · Geology and Paleoclimatology Research (5 works) · Liquid scintillation counting (5 works) · Scintillation counter (5 works)