Hello again everyone! I recently bought two DP-63-A units. The first one (pic 1) is the non-radioactive unit. I actually got it for a decent price of around 150$. This includes the backlit display (I actually hardly ever see these being shown), and no Sr-90 B-8 check source.
The second unit (all other pics) contains the Sr-90 B-9 check source, but it doesn't seem to contain the radium scale. Could someone confirm this with me based on pics 2 and 3? It would actually be good for this not to have a radium scale as I'm not too comfortable with worrying about radon progeny getting stuck everywhere as well as shielding against the gamma. Shielding against a spicy beta only source that
So my goal is to move the check source from one unit to the backlit non-radioactive unit. While I do feel more comfortable handling the Sr-90 check source, I have several questions:
Besides time, gloves, and eyewear, is there any other precautions I should take when handling this spicy check source?
Is the radiation from the check source blocked by the unit's casing? Or will additional shielding like plexiglass be needed to make this safe to display? I want to display this as well as being able to see the check source's activity via pressing the buttons. I would like to assume that this dosimeter is much safer to display out in the open with the absence of the radium scale.
What is the orientation of the batteries? I know this is a bit of a silly question as the polarities are etched on the front. But say on the top battery slot with the + symbol, does this mean the positive side needs to be pointing inward, or facing the person? The positive sign being etched on the other side of the same battery slot (pic 4) kinda throws me off.
I appreciate any answers!