The initial cost of X-ray and Gamma machines is very similar. X-ray generators must be replaced every five to ten years at a cost of $6,000 to $10,000 for a new unit. Over a 20-year period of operation, the cost can be tens of thousands of dollars. In addition, there is the cost of the electricity needed to operate and cool the X-ray generator. The electricity cost will vary depending on usage. Finally, there is line down time from the X-ray tube
exchange process.

Gamma sources require a wipe test every three years at a cost of $50 per wipe test. Over a 20-year period of operation, the average cost of wipe tests is $350. There is no electricity requirement for Gamma source and there is no significant down time for periodic wipe tests.