The techs are behind lead shielding because they would recieve many times beyond the PEL or TLV through a day of work were the shielding not in place.
The person getting the mammogram does it once a year (if that)
Your rough dose of radiation from natural backgraound sources is roughly 350 millirems, depending on lifestyle.
A mammogram exposes you to 70 millirems. Given that, the level of exposure is comparatively minimal.
The person doing the mammogram does it repeatedly throughout the day, day after day, year after year.
As radiation damage is cumulative, they need the shielding.
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