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There are three main divisions of radiation therapy, based on the source generating the rays: 1. Radiation (xrays, gamma rays, beta rays) produced from a valve excited with high voltage. These are only around when the current is on, just as an electromagnet has no magnetism when switched off. 2. Radiation produced by a radio-active source such as radio-active cobalt. These may emit activity for thousands of years, and can't be 'turned off'. The source is enclosed in a lead-lined box and can only be 'stopped' by closing a lead shutter. This is like a light bulb continuously burning, but emitting no light if the door is closed. 3. Radiation from tiny needles containing radium inserted in the body. I'm not sure whether you mean (a) standing close to the patient during treatment or (b) standing close to the patient after treatment has finished. Only in case 3 can you get any radiation from the patient after treatment, and if a partner may be advised not to share a bed until the needles are removed. In the other cases, it is unlikely that you would be allowed close during treatment. Radioactive tracers, e.g. drinks given to test thyroid function, involve a minute and harmless amount of radiation.

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Q: Can being around a patient undergoing radiation therapy cause you to become sterile?
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