<template>
  <label role="radio" tabindex="0">
    <input type="radio" @something="clicked" name="r1" value="One" v-model="picked">
    <span>One</span>
  </label>

  <label role="radio" tabindex="0">
    <input type="radio" @something="clicked" name="r1" value="Two" v-model="picked">
    <span>Two</span>
  </label>
</template>

<script>
// ...
methods: {
  clicked: function() {
    console.log(this.picked);
  }
}
</script>