How to construct CD2 target for experimental nuclear physics

[CFlower]

Hi guys,

I am currently trying to figure out the best way to create a target of deuterated polyethylene for neutron detection. I have ~30g of this very expensive powder and need to determine the best way to create a thick target (thick as in ~5cm, not a thin film like is used for proton detection.) Given how expensive the powder is there is no room for error. I have regular polyethylene to practice with, however given the different melting temperatures etc I need more information.

What is the best way I can create a solid target? I have read many papers and see methods including dissolving it in xylene and letting the xylene evaporate as well as compression techniques and some melting techniques, but all of these are tailored to creating very thin films.

Any help or input is greatly appreciated, I am under a great deal of time pressure. I think it is most likely that I will be using a melting technique, but I absolutely can not burn the polyethylene, nor can there be any bubbles/impurities in the final product.

 

[Achy47]

Creating a thick target of deuterated polyethylene for neutron detection can be a challenging task, especially considering the cost of the powder and the need for precision. After reviewing the methods you have mentioned, I believe that the best approach for your situation would be a compression technique. This involves pressing the powder into a solid target using high pressure and heat. This method has been successfully used in the past for creating thick targets of regular polyethylene for neutron detection.

To begin, you will need to obtain a specialized press that is capable of applying high pressure and heat. This can often be found in research labs or universities. Next, you will need to carefully measure and weigh out the desired amount of deuterated polyethylene powder. Place the powder into a mold that is designed for high pressure and heat applications.

Once the powder is in the mold, it is important to carefully apply the pressure and heat. This process should be done slowly and gradually to ensure that the powder is evenly compressed and there are no air pockets or bubbles. It is also important to monitor the temperature closely to prevent any burning or melting of the polyethylene.

After the target has been successfully compressed, you can remove it from the mold and allow it to cool. It is important to handle the target with care to avoid any damage or contamination. Once cooled, the target should be solid and free of impurities.

I understand that you are under time pressure, so it may be helpful to practice this technique with regular polyethylene first to get a feel for the process and make any necessary adjustments. I hope this information helps you in creating a successful and precise target for your neutron detection needs. Good luck with your research!