Calculate the number of atoms disintegrating per minute in a mass of 0.001 g of radium which is an `alpha`-emitter with a half-life period of 1620 years.

Explanation

To solve the problem of calculating the number of atoms disintegrating per minute in a mass of 0.001 g of radium, which is an alpha-emitter with a half-life of 1620 years, we can follow these steps:

### Step 1: Calculate the decay constant (λ)
The decay constant (λ) can be calculated using the formula:
\[ \lambda = \frac{0.693}{t_{1/2}} \]
where \( t_{1/2} \) is the half-life of the substance.
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