Which ingredients in a sulfur colloid kit are combined and heated during preparation?

The preparation of a sulfur colloid kit involves specific ingredients that allow for the successful formation of the colloid necessary for imaging. The primary ingredients that need to be combined and heated are technetium-99m in the form of 99mTc pertechnetate, the thiosulfate mixture, and an acid.

In this context, 99mTc pertechnetate serves as the radioactive component that will label the sulfur colloid. The thiosulfate mixture acts as a reducing agent, which is crucial in the process of creating the sulfur colloid. The presence of acid is necessary to facilitate the reduction of the pertechnetate and promote the formation of a stable colloid.

Heating these components together leads to a successful reaction that synthesizes the colloid. Given that all three components — 99mTc pertechnetate, thiosulfate mixture, and acid — are essential for this preparation, identifying them together is crucial for producing the effective imaging agent needed in nuclear medicine.

Options that omit one of these critical components would not properly represent the necessary process for colloid formation, leading to less effective or unusable results for imaging purposes.