Sertifikalı Standart Kaynak Kullanılarak Alfa Spektrometre Sisteminin Karakterizasyonu

Öz

Çevresel numunelerdeki alfa radyasyonunu tespit etmek için yüksek çözünürlüklü iki odacıklı bir alfa spektrometresinin kalibrasyon parametreleri, 237Np, 241Am ve 244Cm çekirdeklerini içeren sertifikalı bir standart kaynak kullanılarak değerlendirilmiştir ve doğrulanmıştır. Bu sistemdeki iki adet iyon implanteli katı hal dedektörünün (ULTRA AS serisi) çözünürlük ve verim özellikleri, olası tüm dedektör-kaynak mesafelerinde değerlendirilmiştir. Ölçümlerde kullanılan standart kaynaktan yayılan alfa radyasyonuna karşı alfa dedektörlerinin performansına ilişkin özellikler ve elde edilen sonuçlar detaylı olarak karşılaştırılmıştır.

Anahtar Kelimeler

• Alfa spektrometresi
• Enerji ve verim kalibrasyonu
• FWHM
• Self-absorption.

The Characterisation of an Alpha Spectrometry System using a Certificated Standard Source

Abstract

The calibration parameters of a high resolution two-chamber alpha spectrometer dedicated to detect alpha radiation in environmental samples were evaluated and confirmed using a certified standard source containing 237Np, 241Am and 244Cm nuclides. The resolution and efficiency characteristics for the two ion-implanted solid state detectors (ULTRA AS series) in this system were evaluated at all possible detector-source distances. The characteristics related to the performance of alpha detectors against the alpha radiation emitted from the standard source used in the measurements and the results obtained were compared in detail.

Keywords

• Alpha spectrometry
• Energy and efficiency calibration
• FWHM
• Self-absorption

Kaynakça

1. Aggarwal SK. Alpha-particle spectrometry for the determination of alpha emitting isotopes in nuclear, environmental and biological samples: past, present and future. Analytical Methods 2016; 8:5353–5371.
2. Calin MR, Saizu MA, Radulescu I. Assessments on energy and efficiency calibration of an alpha spectrometry system using standard sources. J Radioanal Nucl Chem. 2013; 298:55–60.
3. Saidoua, Bochud F, Laedermann JP, Kwato Njock MG, Froidevaux P. A comparison of alpha and gamma spectrometry for environmental natural radioactivity surveys. Applied Radiation and Isotopes 2008; 66:215–222.
4. Cember H and Johnson T. Introduction to health physics. New York, USA: McGraw-Hill Companies Inc., 2009.
5. Johansson L. Determination of Pb-210 and Po-210 in aqueous environmental samples. PhD, Leibniz University, 2008.
6. Knoll G. Radiation detection and measurement. New York, USA: John Wiley & Sons Inc., 2000.
7. Leo WR. Techniques for nuclear and particle physics experiments. Germany: Springer-Verlag, 1994.
8. Vajda N, Pöllanen R, Martin P, Kim CK. Alpha Spectrometry. In Handbook of radioactivity analysis Volume 1: Radiation Physics and Detectors, 4th ed. L'Annunziata, MF, 2020, pp. 493–573.

9. ORTEC, Certificate of Conformance Quality Assurance Data (QAD) Sheet, ULTRATM, ENS-Detectors, Oak Ridge.
10. Carvalho FP. Polonium (210Po) and lead (210Pb) in marine organisms and their transfer in marine food chains. Journal of Environmental Radioactivity 2011; 102:462–472.
11. Hafızoğlu N, Sahin L, Ganioğlu E, Ağgez G, Yıldırım Baştemur G, et al. Assessment of Natural and Anthropogenic Radioactivity of the Princes’ Islands in the Sea of Marmara. Water Air Soil Pollution 2020; 231:261:1–16.
12. Kim SH, Hong GH, Lee HM, Cho BE. 210Po in the marine biota of Korean coastal waters and the effective dose from seafood consumption. Journal of Environmental Radioactivity 2017; 174:30–37.
13. ORTEC. Alpha Duo, Alpha Mega and Alpha Ensemble Integrated Alpha Spectrometer Hardware User’s Manual. U.S.A., 2014, 932505.
14. Eckert & Ziegler Nuclitec GmbH. Certificate, Germany, 2016.
15. Eckert & Ziegler Nuclitec GmbH. Calibration Standards and Instruments Product Information. Germany, 2009.
16. CANBERRA. Application Note, Considerations for Choosing an Alpha Spectroscopy PIPS Detector. 2011.
17. Calin MR, Saizu MA, Radulescu I, Druker AE. Experimental characterization of a multi-chamber alpha spectrometry system using standard actinide sources. Nuclear Instruments and Methods in Physics Research A 2013; 705:13–16.
18. AMETEK. Materials Analysis Division, Lecture Notes, Understanding Energy Resolution, USA.