Evidence of shallow TL peak contributions in infrared radiofluorescence

• Infrared radiofluorescence of K-feldspar was measured.
• A TL-like peak shape is noticeable, after bleaching.
• We demonstrate the presence of a shallow TL trap, responsible for the odd peak.

The notion of what is a ‘zero age’ is skewed in IR-RF. For bleached sediment, the IR-RF intensities are found to be at their highest values while it falls at its lowest when it reaches dose saturation. During bleaching, it was shown that a sample emits phosphorescence immediately after bleaching, yet very little is known about it. Here, we will try to identify the source for these trapped electrons.Recent communications in radiofluorescence, have observed an unexpected increase in the beginning of an irradiation, mostly seen in regenerated luminescence. At first glance, this would imply that the increase is tied to an increasingly higher electron capture by the dating trap, during the onset of irradiation. We show that this initial increase is simply due to minute variation in temperature, occurring during the measurements.