We've had people trigger the radiation detectors coming into the nuclear plant due to eating too many bananas. One person in the USA I believe had radiation poisoning from eating too many Brazil nuts. I think the max you should eat are 1 or 2 per day. It does have to do with where they are grown and natural soil radiation. It's everywhere around us and some places just have higher levels than others. Not necessarily dangerous - that's how it is. Shielding is not necessary from such low radiation levels. You will get much more radiation directly from the sun, flights, medical x-rays, rain, snow, etc. I also assume nobody sleeps in their plants, soil mixes, smoke detectors, antiques, propane lanterns, or counter tops all day long every day of their lives. For shielding against significant radiation levels we primarily use heavy concrete, water, lead, and distance.

It's not that DG isn't stable. It's that it's sticks to shoes and is messy as Mayflowers says. If it was right next to the door, there'd be a lot of sand bits tracked into the house, and consequently regret placing it there. There is not a plan for me to draw over so I'm sketching on the photo. It's not a solution. It's an exploration. I could take a better look if you provide an actual plan. (Again, it will look straight down on the yard as opposed to viewing it from an angle. All you need to show is house footprint and perimeter wall ... both these things to a measured scale. If you draw and photograph it, please photograph it with the camera looking straight at it, not at an angle.) What you're calling a gazebo I think I'd call a shade structure since it does not include a floor. You need to account for its size and shape when you design the patio. That doesn't mean, however, that it must be an exact match. It's one of those places tradeoffs might happen on account of your tight space situation. If we have a PLAN, we can see what really fits. Also, you might draw the outline of the shade structure next to the plan, to scale, so we can see what needs to be accommodated. If it was me, I would not home in on patio "tile" blocks just yet.

try a leaf vacuum (most blowers can be used as a vacuum with a bag to capture the leaves). The vacuum will not have the force to pick up much of the DG and any that does will just fall back out of it when you power it off. I have been using this to keep gravel and DG areas clean in my own yard.

Thank you! It’s been a long but rewarding project. So far pleased with the results. So, it is not dirt. We laid down decomposed granite (DG). Still need to apply the stabilizer. We plan to keep it like this for a while to keep the yard drought tolerant and low maintenance. (I am located in SoCal.) Eventually we may install artificial grass in the larger/main area of the yard but will keep the DG and step-stones in the side yard. I do plan to plant ground cover in between the plants, which are various drought tolerant plants.