Once radiopharmaceuticals enter the body and travel to an organ, they begin to interact with the processes of that organ. The radioactivity is picked up by cameras or computers and used to map the process. For example, an ultrasound can show an image of an organ and reveal if a tumor or other abnormality is present. Nuclear medicine can show how the process of glucose metabolism is functioning in the organ.
250g bags of our biltong can last up to 4-months, and we have food testing certificates to prove this, however, we do not advise that you keep it that long. The larger the bag of biltong, i.e 500g or 1kg, the more moisture is contained within the sealed bag.
Official recommendations regarding food safety are often very over-cautious. I have used vacuum-sealed beef brisket after leaving it unrefrigerated for 2 whole days, and it was perfectly good, without even a hint of bad odor. Vacuum sealed food lasts a very long time even when raw. Trust your instincts though.