Experimental study of a methodology for Fission-track Dating without neutron irradiation

Hadler, J.C.; Iunes, P.J.; Tello, C.A.; Chemale, Farid; Kawashita, Koji; Curvo, Eduardo Augusto Campos; Santos, Felipe G. S.; Gasparini, T.E.; Moreira, P.A.F.P.; Guedes, S.

doi:10.1016/j.radmeas.2009.10.081

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…For absolute methods of determining neutron fluence (Soares et al, ), the efficiency should be constant when counting tracks in unknown age samples. The fast‐growing areas of FTD using the Laser Ablation Inductively Couple Plasma Mass Spectrometer (LA‐ICP‐MS, [Hadler et al, ; Hasebe, Barbarand, Jarvis, Carter, & Hurford, ; Soares et al, ; Soares, Mertz‐Kraus, Guedes, Stockli, & Zack, ]) or the electron microprobe (Dias, Chemale, Soares, & Guedes, ; Gombosi, Garver, & Baldwin, ) have the same efficiency issues, and could also benefit from automatic counting.…”

Section: Discussionmentioning

confidence: 99%

Segmentation of nearly isotropic overlapped tracks in photomicrographs using successive erosions as watershed markers

Siqueira

Nakasuga

Guedes

et al. 2019

Microscopy Res & Technique

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Introduction Procedures for measuring and counting tracks are time‐consuming and involve practical problems. The precision of automatic counting methods is not satisfactory yet; the major challenges are distinguishing tracks and material defects, identifying small tracks and defects of similar size, and detecting overlapping tracks. Materials and Methods Here, we address the overlapping tracks issue using the algorithm Watershed Using Successive Erosions as Markers (WUSEM), which combines the watershed transform, morphological erosions and labeling to separate regions in photomicrographs. We tested this method in two data sets of diallyl phthalate (DAP) photomicrographs and compared the results when counting manually and using the classic watershed and H‐watershed transforms. Results The mean automatic/manual efficiency counting ratio when using WUSEM in the test data sets is 0.97 ± 0.11. Conclusion WUSEM shows reliable results when used in photomicrographs presenting almost isotropic objects. Also, diameter and eccentricity criteria may be used to increase the reliability of this method.

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Section: Discussionmentioning

confidence: 99%

Segmentation of nearly isotropic overlapped tracks in photomicrographs using successive erosions as watershed markers

Siqueira

Nakasuga

Guedes

et al. 2019

Microscopy Res & Technique

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“…One such example of this is the determination of the fission-track age via LA-ICP-MS. In this case, uranium content is determined via mass spectrometry and neutron irradiation is not necessary (Hasebe et al 2004;Hadler et al 2009;Ito and Hasebe 2011).…”

Section: Horizontal Confined Induced Fission Tracksmentioning

confidence: 99%

Further investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronology

Soares

Guedes

Tello

et al. 2013

American Mineralogist

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The external detector method (EDM) is a widely used technique in fission track thermochronology (FTT) in which two different minerals are concomitantly employed: spontaneous tracks are observed in apatite and induced ones in the muscovite external detector. They show intrinsic differences in detection and etching properties that should be taken into account. In this work, new geometry factor values, g, in apatite, were obtained by directly measuring the r ed /r is ratios and independently determined [GQR] ed/is values through the measurement of projected lengths. Five mounts, two of which were large area prismatic sections and three samples composed of random-orientation pieces have been used to determine the g-values. A side effect of applying EDM is that the value of the initial confined induced fission track, L 0 , is not measured in routine analyses. The L 0 -value is an important parameter to quantify with good confidence the degree of annealing of the spontaneous fission tracks in unknown-age samples, and is essential for accurate thermal history modeling. The impact of using arbitrary L 0 -values on the inference of sample thermal history is investigated and discussed. The measurement of the L 0 -value for each sample to be dated using an extra irradiated apatite mount is proposed. This extra mount can be also used for determining the g value as an extension of the r ed / r is ratio method. Eight apatite samples from crystalline basement, with grains at random orientation, were used to determine the g-values. The results found are statistically in agreement with the values found for apatite samples (from Durango, Mexico) measured in prismatic section and also measured at random orientation. There was no observable variation in efficiency regarding crystal orientation, showing that it is relatively safe using non-prismatic grains, especially in samples with paucity of grains, as it is the case of most basin samples. Implications for the z-calibration and for the calibration of the direct (spectrometer-based) fission-track dating are also discussed.

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“…In addition, compared to LA-ICP-MS-based FTT Hadler et al, 2009;Soares et al, 2014Soares et al, , 2015, EPMA-FT is advantageous because it is a non-destructive technique; and requires a smaller spot (5 µm) than LA-ICP-MS (20 -50 µm). This virtually eliminates the concern with precise alignment associated with zoning in zircon (regions with lower ages than the coremetamorphism indicators).…”

Section: Introductionmentioning

confidence: 99%

A new approach for electron microprobe zircon fission track thermochronology

Dias

Chemale

Soares³

et al. 2017

Chemical Geology

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Experimental study of a methodology for Fission-track Dating without neutron irradiation

Cited by 14 publications

References 9 publications

Segmentation of nearly isotropic overlapped tracks in photomicrographs using successive erosions as watershed markers

Segmentation of nearly isotropic overlapped tracks in photomicrographs using successive erosions as watershed markers

Further investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronology

A new approach for electron microprobe zircon fission track thermochronology

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