Undergrad Beta and gamma rays from radium

[PainterGuy]

Hi:

A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits – alpha particles, beta particles, and gamma rays.

More specifically, natural radium (which is mostly 226Ra) emits mostly alpha particles, but other steps in its decay chain (the uranium or radium series) emit alpha or beta particles, and almost all particle emissions are accompanied by gamma rays.[14]

Source: https://en.wikipedia.org/wiki/Radium

Question 1:
I think that the first statement suggests that it's the emission of alpha particles, beta particles and gamma rays which raises the temperature of radium sample; possibly on their way out from the sample, those particles and gamma rays collide with some of the radium atoms or daughter atoms and hence the raise in temperature compared to that of the surroundings. Do I make sense?

Question 2:
I find the the second statement confusing. In the past I have mostly read that radium emits alpha, beta, and gamma rays in its process of radioactive decay. Does it mean that the pure element radium only emits alpha particles? No gamma rays as well?

I do not understand the statement where it says "but other steps its decay chain ... emit alpha or beta particles". Could you please help me with it?

Thank you for the help!

 

[hutchphd]

Apparently Radon is the first step

https://www.nist.gov/image-23773#:~... Chain: Radium,beta particle and Bismuth-214;