Skip to main content
placeholder image

Equivalent dose measurement using a single aliquot of quartz

Conference Paper


Abstract


  • The principles behind an additive-dose single-aliquot protocol and the need for such a protocol are outlined. It is shown for two Australian sedimentary quartz samples that the decay of OSL during a repeated measurement cycle, consisting of a 10 s preheat at a given temperature followed by a 0.1 s exposure to green light at 110°C, can be well represented by exponential decay. The decay constant of about 8% per cycle is insensitive to preheat temperatures below about 250°C, but increases to about 35% per cycle at 280°C. This increase is attributed to increasing thermal erosion of the main OSL trap. The decay constant is also shown to be insensitive to dose. An additive-dose protocol is presented which requires only one aliquot for the estimation of the equivalent dose (De). This protocol has been applied to quartz from 11 Australian sites. To illustrate the value of the single-aliquot approach, the apparent values of De for 14 samples, containing doses of between 0.01 and 100 Gy, have been measured in triplicate at preheat temperatures of between 150 and 300°C, using a single aliquot for each De measurement. It is shown that low temperature preheats ( ∼ 200°C for 10 s) are appropriate for the younger samples containing the smaller doses, but a much higher temperature preheat (≥280°C for 10 s) is required for the older samples containing the larger doses. Excellent agreement is found between these single-aliquot estimates of De and those from additive-dose multiple-aliquot protocols, over the entire dose range. © 1997 Elsevier Science Ltd.

Publication Date


  • 1997

Citation


  • Murray, A. S., Roberts, R. G., & Wintle, A. G. (1997). Equivalent dose measurement using a single aliquot of quartz. In Radiation Measurements Vol. 27 (pp. 171-184). doi:10.1016/S1350-4487(96)00130-8

Scopus Eid


  • 2-s2.0-0031123894

Start Page


  • 171

End Page


  • 184

Volume


  • 27

Issue


  • 2

Abstract


  • The principles behind an additive-dose single-aliquot protocol and the need for such a protocol are outlined. It is shown for two Australian sedimentary quartz samples that the decay of OSL during a repeated measurement cycle, consisting of a 10 s preheat at a given temperature followed by a 0.1 s exposure to green light at 110°C, can be well represented by exponential decay. The decay constant of about 8% per cycle is insensitive to preheat temperatures below about 250°C, but increases to about 35% per cycle at 280°C. This increase is attributed to increasing thermal erosion of the main OSL trap. The decay constant is also shown to be insensitive to dose. An additive-dose protocol is presented which requires only one aliquot for the estimation of the equivalent dose (De). This protocol has been applied to quartz from 11 Australian sites. To illustrate the value of the single-aliquot approach, the apparent values of De for 14 samples, containing doses of between 0.01 and 100 Gy, have been measured in triplicate at preheat temperatures of between 150 and 300°C, using a single aliquot for each De measurement. It is shown that low temperature preheats ( ∼ 200°C for 10 s) are appropriate for the younger samples containing the smaller doses, but a much higher temperature preheat (≥280°C for 10 s) is required for the older samples containing the larger doses. Excellent agreement is found between these single-aliquot estimates of De and those from additive-dose multiple-aliquot protocols, over the entire dose range. © 1997 Elsevier Science Ltd.

Publication Date


  • 1997

Citation


  • Murray, A. S., Roberts, R. G., & Wintle, A. G. (1997). Equivalent dose measurement using a single aliquot of quartz. In Radiation Measurements Vol. 27 (pp. 171-184). doi:10.1016/S1350-4487(96)00130-8

Scopus Eid


  • 2-s2.0-0031123894

Start Page


  • 171

End Page


  • 184

Volume


  • 27

Issue


  • 2