Abstract
Positron imaging technique is a new technology that enables to observe the materials transportation in living things using RI tracer labeled with a positron-emitting nuclide. In the positron imaging, a pair of annihilation gamma rays, generated by pair annihilation of a positron with an electron, are detected coincidently. In medical, positron emission tomography (PET) is used in a diagnostic imaging of cancer as a powerful tool. Plant positron imaging system is using the same measurement principle with PET and is developed as a device specialized for research on plants.
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Exercises
Exercises
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1.
Complete the sentences by selecting the appropriate words for [a] to [k] from the word list below referencing the text of this chapter:
Positron imaging is a technology for measuring, in the form of images and in a [a] manner, compounds that are transferred within living bodies without damaging them using, as [b], positron-emitting radionuclides that emit [c] (positrons) when they decay. In the field of medicine, positron imaging is being utilized in the form of [d] (positron emission tomography ) for image-based diagnosis of cancers.
When a positron-emitting radionuclide β+ decays , a [e] in the atomic nucleus changes into a [f], and a positron is emitted as the differential electric charge between the [e] and [f]. For example, decaying of 11C (carbon-11 ), which is a positron-emitting radionuclide, turns it into 11B (boron-11), whose [g] is the same as that of 11C and whose atomic number is one less than that of 11C. Positrons are called [c] because they are antiparticles of electrons which have [h] electric charges. A positron emitted from an atomic nucleus has [i]. It will fly around in random directions and ultimately [j] together with an electron. This annihilation generates a pair of 511 keV gamma rays (annihilation gamma rays ). One of these gamma rays corresponds to the [g] of the positron and the other to the [g] of the electron. These two annihilation gamma rays travel in opposite directions (i.e., in directions 180° apart from each other). In positron imaging measurement, the pair of annihilation gamma rays is measured using the [k] method.
16.1.1 Word List
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Positive electrons
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Coincident counting
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Tracers
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Mass
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Annihilates
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Noninvasive
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energy
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PET
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Positive
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Proton
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Neutron
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Refer the text of this chapter, mark the correct ones out of the following five statements ([1] to [5]) with a ○ mark and the incorrect ones with a × mark.
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[1] Short positron-emitting radionuclides are of no advantage for studies of plants, because most of them have a short half-life and their radioactivity decays in a short period of time.
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[2] The only positron-emitting radionuclides that can be used for studies of plants are the so-called four PET radionuclides: 11C (carbon-11 ), 13N (nitrogen-13) , 15O (oxygen-15), and 18F (fluorine-18).
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[3] Because positron-emitting radionuclides emit gamma rays with strong penetrating power, they can be utilized as tracers to measure the transport of nutrients in plants in the form of images.
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[4] Images that can be obtained with positron imaging are not shape images like ones from X-ray CT but function images that reflect functions of living bodies.
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[5] The measurement principles of PET equipment, which is used for cancer diagnosis , etc., and the measurement principles of PETIS (plant positron imaging equipment), which is used for studies of plants, are the same.
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Matsuhashi, S. (2018). Radiation-Based Plant Diagnostics: Positron Imaging-Based Studies of Plants. In: Kudo, H. (eds) Radiation Applications. An Advanced Course in Nuclear Engineering, vol 07. Springer, Singapore. https://doi.org/10.1007/978-981-10-7350-2_16
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