Finally describe the synthesis and analysis of the radiotracer.

8. Companies delivering radioactive sources have to follow strict safety rules. One rude is that sources must be labelled. The following information is displayed on a label on a radioactive source. Source: Year of delivery: Half life: Activity: RADIOACTIVE SOURCE stop clock (a) (1) State what is meant by an activity of 25 kBq. (ti) Calculate the activity of the source in the year 2053. (b) After delivery, the source is placed in a thick walled aluminium storage box. State which type of radiation from the source, if any, could be detected on the outside of the storage box. You must justify your answer/ 88.88 A technician using an alpha-emitting source investigates its activity using the apparatus shown below. beta and gamma emitter 2017 detector 12 years 25 kBa source counter 888888 (a) In a time of 2 minutes the counter measures 40 800 counts. Calculate the count rate measured. (b) Whilst handling the source, the technician estimates that their hand receives an absorbed dose of 5-00x 10³ Gy. The mass of the technician's hand is 400g. (1) Calculate the total energy absorbed by the technician's hand. (1) Using information from the data sheet, calculate the equivalent dose received by the technician's hand. (6)

Why was this particular molecule selected among other candidates? Why is this molecule better/different from competitors? What parameters were important in the selection process?

Finally describe the synthesis and analysis of the radiotracer. Radiochemical yield, purity, synthesis-time, use of automated equipment, single step or multiple step synthesis, challenges.

239 Calculate the mean decay constant (i.e. in one delayed neutron group ) for U2³³, U2³5 and Pu²³⁹. You are required to state the reference from which the data was extracted.

Calculate the neutron life time having an energy of 0.25 MeV in an infinite homogeneous medium of U235. The absorption cross section is 1.6 barn and the mass density of U is 19 gr/cm³.