This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear Medicine and Molecular Imaging, Subject name: Radiology
[{'content': 'After emitting an a particle, what will happen to daughter nuclei \nSelect and explain. \nA. Mass number increases by 4, B. Mass number decreases by 4, C. Atomic number increases by 4, D. Atomic number decreases by 4', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: b (Mass number decreases by 4) Ref: Grainger and Allison's radiology, 4th ed, 139; Park, 19th ed, p. 600Charge of an alpha particle is +2 and mass is 4 units. Source of alpha particle is nucleus.PropertyabgX-raysNature2He4 or 2a4Charge +2 mass 4 unit-2e=bCharge = -1Mass almost zero.0g0No charge no massElectromagnetic waves, no chargeSourceNucleusConsists of electron of nuclear originHigh frequency radiation having highKinetic energy.Produced when a beam of high speed cathode rays strike tungsten target.Penetrating power+++++++variableIonizing or damaging power10,000 x100 xX-Frequency and wavelength are inversely related.Neutrons are uncharged particles with variable penetration power.Alpha particles are positively charged heavy particles with less penetrating power.X-rays are electromagnetic waves which are generated when a beam of high speed cathode rays strike the anode.", 'role': 'assistant'}]