Atoms 2013, 1(1), 2-12; doi:10.3390/atoms1010002
Review

Emission of β+ Particles Via Internal Pair Production in the 0+ – 0+ Transition of 90Zr: Historical Background and Current Applications in Nuclear Medicine Imaging

1 Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti, ENEA, Centro Ricerche Casaccia, Rome, Italy 2 Department of Human Anatomy, Histology, Forensic Medicine and Orthopedics, Sapienza University of Rome, Via Borelli 50, 00161 Rome, Italy 
Received: 23 January 2013; in revised form: 14 February 2013 / Accepted: 26 February 2013 / Published: 8 March 2013
(This article belongs to the Special Issue Feature Papers 2012/2013)
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Abstract: 90Y is traditionally considered as a pure βemitter. However, the decay of this radionuclide has a minor branch to the 0+ first excited state of 90Zr at 1.76 MeV, that is followed by a β+emission. This internal pair production has been largely studied in the past because it is generated by a rare electric monopole transition (E0) between the states 0+/0+ of 90Zr. The positronic emission has been recently exploited for nuclear medicine applications, i.e. positron emission tomography (PET) acquisitions of 90Y-labelled radiopharmaceuticals, widely used as therapeutic agents in internal radiation therapy. To date, this topic is gaining increasing interest in the radiation dosimetry community, as the possibility of detecting β+ emissions from 90Y by PET scanners may pave the way for an accurate patient-specific dosimetry. This could lead to an explosion in scientific production in this field. In the present paper the historical background behind the study of the internal pair production of the 0+/0+ transition of 90Zr is presented along with most up to date measured branch ratio values. An overview of most recent studies that exploit β+ particles emitted from 90Y for PET acquisitions is also provided.
Keywords: Internal pair production; monopole transition; 90Y decay; positron emission tomography

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MDPI and ACS Style

D'Arienzo, M. Emission of β+ Particles Via Internal Pair Production in the 0+ – 0+ Transition of 90Zr: Historical Background and Current Applications in Nuclear Medicine Imaging. Atoms 2013, 1, 2-12.

AMA Style

D'Arienzo M. Emission of β+ Particles Via Internal Pair Production in the 0+ – 0+ Transition of 90Zr: Historical Background and Current Applications in Nuclear Medicine Imaging. Atoms. 2013; 1(1):2-12.

Chicago/Turabian Style

D'Arienzo, Marco. 2013. "Emission of β+ Particles Via Internal Pair Production in the 0+ – 0+ Transition of 90Zr: Historical Background and Current Applications in Nuclear Medicine Imaging." Atoms 1, no. 1: 2-12.

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