Introduction to Neutron Activation Analysis (read)
The exercise will consist of two main parts:
1. Thermal INAA of total chlorine in organic solutions using HPGe gamma spectroscopy.
2. Put on lab-coat and dose-meter on the outside of the barrier.
3. Put on shoe cover (plastic) according to the demonstrations of the laboratory assistant and enter into the “hot” side of the barrier. Bring a minimum of papers into the laboratory.
4. The NAA laboratory facility, which originally consists of 3 wet-chemistry labs and 2 instrument labs, has temporarily only available 1 wet-chemistry lab and 1 instrument lab. All sample preparation, including sample transfer to and from the reactor, is performed in the chemistry lab. As soon as the sample is irradiated, prepared and ready for detection, it is transferred to the instrument, or counting lab.
5. Detection will be carried out with an HPGe detector coupled to common nuclear electronics and a PC-operated MCA based on the Maestro-program from Ortec.
6. It is important that the students strictly follow the instructions from the lab.-assistant(s) and not operate on “their own”.
7. When the practical tasks in the laboratory is finished, it is time to leave the NAA-laboratory. Collect your belongings and follow the procedure:
- Go to the wardrobe with the barrier
- Check your hands and lab-coat for contamination with a contamination monitor.
- Take off the lab-coat and place it in a designed plastic bag.
- Wash your hands
- Remove the shoe plastic cover according to demonstration by the lab-assistant.
- Enter the non-radioactive side of the barrier.
- Carry out all calculations in the assigned conference room.
Determination of Total Cl in Organic Liquids
Natural Cl has the two stable isotopes 35Cl (35%) and 37Cl (65%). Thermal neutrons induce the two reactions 35Cl (n,γ) 36Cl (T1/2 = 3*105 ) and 37Cl (n,γ) 38Cl (T1/2 = 37.3 min). Only the second reaction is useful here. The actual gamma energies for 38Cl are 1642.7 keV and 2167.6 keV.
The detailed procedure is:
Questions for the Students
Here there should be relevant questions regarding the theory of the exercise which should be possible to answer after the exercises have been performed. The questions should be molded into the report that the students write after the exercises in such a way that it feels natural.
How to do calculations or other important aspects for the theory that is not directly related to exercise.
Here the safety aspects of the exercises should be written. Because of the different rules in different countries this will probably never be correct for every user. It should at least contain HMDS for the chemical compounds used or relevant links to used equipment.
Description of the equipment needed and used during the exercises.
The preparation that the lab Supervisor needs to do to ready the lab.
Here there should be a link to a open page where people who have used the exercise can leave feedback. How the exercises worked and troubles in performing it.