Detection of Irradiated In-Shell Peanuts (Arachis hypogaea) by Screening PPSL and Confirmatory TL Luminescence Methods
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In this work, the luminescence methods of pulsed photo-stimulated luminescence (PPSL, as screening) and thermoluminescence (TL, as confirmatory) were used for identification of non-irradiated and low-dose irradiated (1–5 kGy) in-shell peanuts from light emissions of silicate minerals incorporated in the shell. The minerals were irradiated with 90Sr beta particles, 60Co and 137Cs gamma rays. Screening PPSL response detected peanut shell as irradiated from 80 Gy for 60Co and 30 Gy for 137Cs gamma rays. Irradiated (60Co and 137Cs) peanut shell samples were positively detected with PPSL after 4.5 and 14 months. A complex TL glow curve composed of at least two maxima was exhibited by the minerals. Using the TL1/TL2 ratio, the in-shell peanuts were identified as irradiated from 50, 120, and 100 Gy of 90Sr, 60Co, and 137Cs radiation, respectively. Moreover, the TL glow curve shape was also used to identify the peanut shell minerals as irradiated at lower dose of radiation. After 34 days of storage, the peanut shell minerals showed enough TL emissions for their identification as irradiated.
KeywordsIn-shell peanuts Confirmatory TL Screening PPSL 90Sr beta radiation Gamma rays
This work has been founded by CONACYT-253777 and SIP-IPN-20181800 projects. The authors are grateful to Francisco García (ICN-UNAM) for their assistance in irradiation samples.
This study was funded by CONACYT (grant number 253777) and SIP-IPN (grant number 20181800).
Compliance with Ethical Standards
Conflict of Interest
Author J. Roman-Lopez declares that he has no conflict of interest. Author I.B. Lozano declares that she has no conflict of interest. Author J.A.I. Diaz-Góngora declares that he has no conflict of interest. Author J.I. Guzman-Castañeda declares that he has no conflict of interest. Author E. Cruz-Zaragoza declares that he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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